CAN COMMUNICATION SYSTEM DIAGNOSIS SYSTEM


  1. CHECK FOR INSTALLED SYSTEMS (ECUS AND SENSORS) THAT USE CAN COMMUNICATION


    1. The systems (ECUs and sensors) that use CAN communication vary depending on the vehicle and optional equipment. Check which systems (ECUs and sensors) are installed to the vehicle.

      Bus ECU/Sensor Name GTS Display Applicability
      V bus Network gateway ECU CAN Gateway1 Installed on all vehicles
      Bus 1 Clearance warning ECU assembly Clearance Warning (Clearance Sonar) Vehicles with LEXUS Parking Assist-sensor System
      Parking assist ECU Panoramic View Monitor Vehicles with panoramic view monitor system
      Forward recognition camera Front Camera Module Vehicles with Lexus Safety System +
      Millimeter wave radar sensor assembly Front Radar Vehicles with Lexus Safety System +
      Front television camera assembly Front Camera Vehicles with panoramic view monitor system
      Driving support ECU assembly Driving Support (Cruise Control-ACC) Vehicles with Lexus Safety System +
      Side camera RH (outer rear view mirror assembly RH) Side Camera RH Vehicles with panoramic view monitor system
      Side camera LH (outer rear view mirror assembly LH) Side Camera LH Vehicles with panoramic view monitor system
      Rear television camera assembly Parking Assist Monitor System Vehicles with panoramic view monitor system or parking assist monitor system w/o parallel parking assist function
      Blind spot monitor sensor LH Blind Spot Monitor Master Vehicles with blind spot monitor system
      Bus 2 ECM ECM (Engine) Installed on all vehicles
      Engine stop and start ECU Stop and Go/Start Vehicles with stop and start system
      Bus 3 Option connector (bus buffer ECU) Accessory Gateway Vehicles with option connector (bus buffer ECU)
      Telematics transceiver DCM Vehicles with manual (SOS) switch
      Radio receiver assembly Display and Navigation (AVN) Installed on all vehicles
      Bus 4 Skid control ECU (brake actuator assembly) Skid Control (ABS/VSC/TRAC) Installed on all vehicles
      4WD ECU assembly Four Wheel Drive Control Vehicles for AWD
      Tire pressure warning ECU and receiver Tire Pressure Installed on all vehicles
      Absorber control ECU Suspension Control (Air Suspension) Vehicles with AVS
      Power steering ECU assembly Power Steering (EPS) Installed on all vehicles
      Steering sensor Spiral cable (Steering Angle Sensor) Installed on all vehicles
      Occupant detection ECU Occupant Detection Vehicles with 12.3 inch display type audio and visual system
      Yaw rate sensor assembly Yaw Rate Sensor Vehicles with TFT meter type combination meter assembly
      Airbag sensor assembly Airbag Installed on all vehicles
      Bus 5 Certification ECU (smart key ECU assembly) Certification (Smart) Installed on all vehicles
      Combination meter mirror ECU (headup display) Head Up Display Vehicles with headup display system
      Headlight ECU sub-assembly LH Headlight swivel (AFS) Installed on all vehicles
      Combination meter assembly Combination Meter Installed on all vehicles
      Air conditioning amplifier assembly Air Conditioning Amplifier Installed on all vehicles
      Main body ECU (multiplex network body ECU) Main Body Installed on all vehicles
      Sub bus 1

      • Outer mirror control ECU assembly (for front passenger side) (for LHD)

      • Outer mirror control ECU assembly (for driver side) (for RHD)

      		 Outer Mirror Control (R Seat) Vehicles with seat position memory system

      • Outer mirror control ECU assembly (for driver side) (for LHD)

      • Outer mirror control ECU assembly (for front passenger side) (for RHD)

      		 Outer Mirror Control (L Seat) Vehicles with seat position memory system

      • Position control ECU and switch assembly LH (for LHD)

      • Position control ECU and switch assembly RH (for RHD)

      		 D-Seat Vehicles with seat position memory system

      • Position control ECU and switch assembly RH (for LHD)

      • Position control ECU and switch assembly LH (for RHD)

      		 P-Seat Vehicles with seat position memory system
      Multiplex tilt and telescopic ECU Multiplex Tilt and Telescopic Installed on all vehicles
      Multiplex network door ECU Back Door Vehicles with power back door system

      Tech Tips

      The names of ECUs and sensors shown on the GTS display may differ from those shown in the DTC Table by ECU section.

  2. CAN BUS CHECK

    Tech Tips

    The ECUs and sensors that are properly connected to the CAN communication system can be displayed using the GTS.


    1. Using the GTS, select the CAN Bus Check screen.

      Note


      • It may be possible to select buses that do not have ECUs or sensors from the bus selection pull-down menu. This is not a malfunction. (This occurs when optional devices are not on a sub bus that is monitored by a gateway function equipped ECU.)

      • In the bus selection pull down menu, all buses applicable to the model are displayed (e.g. LIN communication buses are also displayed). Therefore, refer to the wiring diagrams to check the names of sub buses for CAN communication.

        Click here

      Tech Tips

      Different connection statuses are indicated by the background color of ECUs and sensors that are displayed.

      Explanation of CAN Bus Check Screen
      Bus Type Background Color Connection Status
      Bus 2 White Communication has been normal since the start of the CAN bus check.
      Yellow Communication stop occurred at least once since the start of the CAN bus check, but communication is currently occurring (unstable communication).
      Red Communication was established at least once since the start of the CAN bus check, but communication is currently not occurring (unstable communication).
      Not displayed Communication stop has continued since the start of the CAN bus check.*1

      Non-bus 2

      (gateway function equipped ECU that does not have history of connected ECUs)*2

      		 White Communication has been normal since the start of the CAN bus check.
      Yellow Communication stop occurred at least once since the start of the CAN bus check, but communication is currently occurring (unstable communication).
      Red Communication was established at least once since the start of the CAN bus check, but communication is currently not occurring (unstable communication).
      Not displayed Communication stop has continued since the start of the CAN bus check.*1

      Non-bus 2

      (gateway function equipped ECU that has history of connected ECUs)*3

      		 White Communication has been normal since the start of the CAN bus check.
      Yellow Communication stop occurred at least once since the start of the CAN bus check, but communication is currently occurring (unstable communication).
      Red

      Currently not communicating (either of the following):


      • Communication stop has continued since the start of the CAN bus check.

      • Communication was established at least once since the start of the CAN bus check, but communication is currently not occurring.
      Not displayed

      Either of the following:


      • If a gateway function equipped ECU cannot communicate, the non-bus 2 and ECUs connected to the non-bus 2 will not be displayed.

      • If no ECUs are connected to the non-bus 2, "There is no system found on the Communication Bus" will be displayed.

      Tech Tips


      • Gateway function equipped ECUs relay signals between the ECUs connected to the different buses.

      • *1: ECUs that are present in the vehicle but are not displayed on the CAN Bus Check screen.

      • *2: Gateway function equipped ECU that does not memorize the non-bus 2 ECUs that are connected to it.

      • *3: Gateway function equipped ECU that memorizes the non-bus 2 ECUs that are connected to it.

      • If none of the connected ECUs are displayed, or there is no response from the vehicle to the GTS, check the central gateway ECU and the V bus branch lines for a malfunction.

    2. Observe the connection response screen for approximately 2 minutes to check for a change in connection status of the connected ECUs and sensors.

      Tech Tips


      • If an open occurs in one of the lines of a CAN branch (except DLC3), output from the other branch line (the line that is not open) will be unstable and it may interfere with the response (display) of other ECUs and sensors.

      • If the connection status changes during the inspection, repair the open in the branch line of the ECU or sensor that does not respond (is not detected) and then perform the CAN bus check again.

  3. HOW TO INTERPRET CAN BUS CHECK SCREEN


    1. When a communication stop is currently occurring, the probable malfunctioning part can be determined from the CAN bus check and by using the following methods.

      Note

      The following CAN bus wiring diagram is provided only as an example. This wiring diagram is different from the actual wiring diagram for this vehicle.

      Tech Tips


      • When a communication stop is currently occurring, it is easier to determine the probable malfunctioning part from the CAN bus check rather than from communication DTCs.

      • Wait for approximately 2 minutes after turning the engine switch on (IG) (or simulating the driving conditions that enable the malfunction to be reproduced) and select "CAN Bus Check". Then observe the communication status of each ECU on the screen.

    2. If a communication error of only 1 ECU or sensor is indicated on the CAN Bus Check screen, a communication stop of the ECU or sensor is suspected.

      Example: Open in both CAN branch lines of ECU D on the bus 2

      B005N7CC05
      *a Bus 2 *b Non-bus 2
      *c V Bus *d Terminating Resistor
      *e Location of Malfunction *f Not displayed or background color changes to red or yellow
      *g CAN Bus Check Screen *h Network Gateway ECU

      Tech Tips

      When there are communication stops, ECUs that are present in the vehicle may not be displayed on the CAN Bus Check screen.

    3. B005LGIC04
      *a Background color periodically changes to yellow or red
      *b Not displayed or background color is yellow or red
      *c Not displayed

      If communication errors for multiple ECUs or sensors are indicated on the CAN Bus Check screen, then a communication stop of the ECU or sensor that shows a more serious communication stop (an ECU or sensor which is not displayed) is suspected.

      Example: Open in a CAN branch line for ECU B on the bus 2

      Explanation of CAN Bus Check Screen
      Bus Type Background Color Connection Status
      Bus 2 White Communication has been normal since the start of the CAN bus check.
      Yellow Communication stop occurred at least once since the start of the CAN bus check, but communication is currently occurring (unstable communication).
      Red Communication was established at least once since the start of the CAN bus check, but communication is currently not occurring (unstable communication).
      Not displayed Communication stop has continued since the start of the CAN bus check.*1

      Non-bus 2

      (gateway function equipped ECU that does not have history of connected ECUs)*2

      		 White Communication has been normal since the start of the CAN bus check.
      Yellow Communication stop occurred at least once since the start of the CAN bus check, but communication is currently occurring (unstable communication).
      Red Communication was established at least once since the start of the CAN bus check, but communication is currently not occurring (unstable communication).
      Not displayed Communication stop has continued since the start of the CAN bus check.*1

      Non-bus 2

      (gateway function equipped ECU that has history of connected ECUs)*3

      		 White Communication has been normal since the start of the CAN bus check.
      Yellow Communication stop occurred at least once since the start of the CAN bus check, but communication is currently occurring (unstable communication).
      Red

      Currently not communicating (either of the following):


      • Communication stop has continued since the start of the CAN bus check.

      • Communication was established at least once since the start of the CAN bus check, but communication is currently not occurring.
      Not displayed

      Either of the following:


      • If a gateway function equipped ECU cannot communicate, the non-bus 2 and ECUs connected to the non-bus 2 will not be displayed.

      • If no ECUs are connected to the non-bus 2, "There is no system found on the Communication Bus" will be displayed.

      Tech Tips


      • Gateway function equipped ECUs relay signals between the ECUs connected to the different buses.

      • *1: ECUs that are present in the vehicle but are not displayed on the CAN Bus Check screen.

      • *2: Gateway function equipped ECU that does not memorize the non-bus 2 ECUs that are connected to it.

      • *3: Gateway function equipped ECU that memorizes the non-bus 2 ECUs that are connected to it.

      • The example of the CAN Bus Check screen in the illustration shows the result of electrical noise on the CAN bus which is caused by an open in a CAN branch line of ECU B (output from the other branch line is unstable) and the communication of ECU A is also unstable. In addition, in this example, ECU A is equipped with a gateway function. Therefore, communication is also unstable between the non-bus 2 ECUs of ECU A and the bus 2.

      • The example in the illustration shows that ECU B is not displayed on the CAN Bus Check screen. This indicates a more significant communication stop. In this case, a communication stop of ECU B is suspected.

    4. B005NZ0C04
      *a Not displayed or background color changes to red

      If a communication error is indicated on both the bus 2 and non-bus 2 on the CAN Bus Check screen, suspect any communication stop displayed for the bus 2 first.

      Example: Open in both CAN branch lines of ECU A on the bus 2

      Tech Tips


      • In the CAN bus check, it is possible to confirm the communication status of ECUs connected to the bus 2 after connecting the GTS to the DLC3. As for non-bus 2, it is possible to confirm which non-bus 2 connected ECUs can communicate with a gateway function equipped ECU on the bus 2.

      • If a gateway function equipped ECU has a communication error, ECUs connected to the gateway function equipped ECU are also affected, and communication stops will be indicated.

      • The CAN Bus Check screen in the illustration shows that ECU A has a gateway function and a communication stop in ECU A is suspected.

    5. B005OLJC04
      *a Background color changes to red

      If the CAN Bus Check screen indicates a communication stop only in the non-bus 2, a communication stop in the non-bus 2 is suspected.

      Example: Open in both CAN branch lines of ECU G on the non-bus 2

      Tech Tips


      • A communication error in a non-bus 2 does not affect the bus 2 or other buses.

      • When a gateway function equipped ECU has memorized the ECUs that are connected to the non-bus 2, if any of the ECUs connected to the gateway function equipped ECU has a communication error, the background color changes to yellow or red. (The displayed name will not disappear.)

    6. If both of the bus 2 main bus lines are open, ECUs or sensors that are located farther away from the network gateway ECU than the open part will be displayed as a communication stop on the CAN Bus Check screen.

      (In this case, ECU D and E are not displayed or their background color changes to red.)

      B005PIDC04
      *a Bus 2 *b Non-bus 2
      *c V Bus *d Terminating Resistor
      *e Location of Malfunction *f Not displayed or background color is red
      *g CAN Bus Check Screen *h Network Gateway ECU

      Tech Tips

      If a communication error occurs in an ECU, it is not displayed on the CAN Bus Check screen even though the ECU is present.

    7. If both of the non-bus 2 main bus lines are open, ECUs that are located farther away from the network gateway ECU than the open part will be displayed as a communication stop on the CAN Bus Check screen.

      (In this case, ECU I and J are not displayed or their background color changes to red.)

      B005N3AC04
      *a Bus 2 *b Non-bus 2
      *c V Bus *d Terminating Resistor
      *e Location of Malfunction *f Not displayed or background color is red
      *g CAN Bus Check Screen *h Network Gateway ECU
    8. B005NY9C04
      *a When any of the following malfunctions occur on the bus 2
      *b When any of the following malfunctions occur on a non-bus 2
      *c Not displayed

      When any of the following malfunctions occur, CAN communication cannot be established and almost all ECUs and sensors on the bus show a communication error on the CAN Bus Check screen.

      Details of Malfunction
      Short between CAN lines (CANH and CANL)
      Short between a CAN line (CANH or CANL) and +B
      Short between a CAN line (CANH or CANL) and ground
      Open in a CAN main bus line

      Tech Tips


      • When a malfunction occurs in the bus 2, almost all ECUs and sensors on the bus 2 and non-bus 2 indicate a communication error (almost all ECUs are not displayed). As communication with the gateway function equipped ECU that is connected to the bus 2 stops, communication from the ECUs connected to the non-bus 2 that is monitored by the gateway function equipped ECU also stops (these ECUs are not displayed).

      • When a malfunction occurs in a non-bus 2, almost all ECUs connected to the non-bus 2 indicate a communication error.

      • A communication error in a non-bus 2 does not affect the bus 2 or other buses.

      • The malfunctioning part can be determined by checking for a short circuit between CAN bus lines or between a CAN bus line and ground or +B short using an electrical tester.

  4. DTC TABLE BY ECU

    Tech Tips


    • In the CAN communication system, the CAN communication DTCs of each ECU can be displayed using the GTS.

    • If CAN communication system DTCs are output, the malfunction cannot be determined only by the DTCs. Perform troubleshooting according to How to Proceed with Troubleshooting.

      Click here

    • If there is a malfunction currently, DTCs can be checked by performing steps in the DTC check procedure.


    1. ECM (for 2GR-FKS) / GTS Display "Engine"


      Powertrain > Engine > Trouble Codes

      Tech Tips


      • This ECU uses the CAN communication system for DTC communication.

      • *1: Refer to SFI System.

        - Click here (w/ Canister Pump Module)

        - Click here (w/o Canister Pump Module)

      • *2: w/ Lexus Safety System +

      ECM / GTS Display "Engine"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter Multi-information Display DTC Storage Method
      U010187*1 Lost Communication with TCM Missing Message The ECM does not receive data from the TCM for 1.25 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 1 second or more.

      • The power source voltage of the ECM is 10.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 2.25 seconds. MIL illuminates. - DTC is stored until it is cleared using the GTS.
      U110487*2 Lost Communication with Driving Support ECU Missing Message The ECM does not receive data from the driving support ECU assembly for 1.02 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 2.1 seconds or more.

      • The dynamic radar cruise control system (vehicle control mode) is operating.

      		 Drive the vehicle at a speed of 40 km/h (25 mph) or more with the cruise control main switch on and operate the dynamic radar cruise control system for 3.12 seconds or more. - Displays messages on the multi-information display. DTC is stored until it is cleared using the GTS.

    2. ECM (2GR-FKS) / GTS Display "Transmission"


      Powertrain > Transmission > Trouble Codes

      Tech Tips


      • This ECU uses the CAN communication system for DTC communication.

      • *: Refer to Automatic Transaxle System.

        - Click here (for U881E Automatic Transaxle)

        - Click here (for U881F Automatic Transaxle)

      ECM / GTS Display "Transmission"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter Multi-information Display DTC Storage Method
      U010087* Lost Communication with ECM/PCM "A" Missing Message The TCM does not receive data from the ECM for 1.25 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 1 second or more.

      • The power source voltage of the ECM is 10.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 2.25 seconds. MIL illuminates. - DTC is stored until it is cleared using the GTS.

    3. ECM (for 8AR-FTS) / GTS Display "Engine"


      Powertrain > Engine > Trouble Codes

      Tech Tips


      • This ECU uses the CAN communication system for DTC communication.

      • *1: Refer to SFI System.

        Click here

      • *2: w/ Stop and Start System

      ECM / GTS Display "Engine"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter Multi-information Display DTC Storage Method
      U010187*1 Lost Communication with TCM Missing Message The ECM does not receive data from the TCM for 1.25 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 1 second or more.

      • The power source voltage of the ECM is 10.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 2.25 seconds. MIL illuminates. - DTC is stored until it is cleared using the GTS.
      U110387*2 Lost Communication with Stop and Start Control Module Missing Message The ECM does not receive data from the engine stop and start ECU for 1.64 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 1 second or more.

      • The power source voltage of the ECM is 10.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 2.64 seconds. - - DTC is stored until it is cleared using the GTS.

    4. ECM (8AR-FTS) / GTS Display "Transmission"


      Powertrain > Transmission > Trouble Codes

      Tech Tips


      • This ECU uses the CAN communication system for DTC communication.

      • *1: Refer to Automatic Transmission System.

        - Click here (for U661E Automatic Transaxle)

        - Click here (for U661F Automatic Transaxle)

      • *2: w/ Stop and Start System

      ECM / GTS Display "Transmission"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter Multi-information Display DTC Storage Method
      U010087*1 Lost Communication with ECM/PCM "A" Missing Message The TCM does not receive data from the ECM for 1.25 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 1 second or more.

      • The power source voltage of the ECM is 10.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 2.25 seconds. MIL illuminates. - DTC is stored until it is cleared using the GTS.
      U110387*2 Lost Communication with Stop and Start Control Module Missing Message The ECM does not receive data from the engine stop and start ECU for 1.64 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 1 second or more.

      • The power source voltage of the ECM is 10.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 2.64 seconds. - - DTC is stored until it is cleared using the GTS.

    5. ECM / GTS Display "Cruise Control"


      Powertrain > Cruise Control > Trouble Codes

      Tech Tips

      This ECU uses the CAN communication system for DTC communication.

      ECM / GTS Display "Cruise Control"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter Multi-information Display DTC Storage Method
      U012287 Lost Communication with Vehicle Dynamics Control Module Missing Message The ECM does not receive data from the skid control ECU (brake actuator assembly) for 2.65 seconds or more.

      All conditions are met:


      • The engine switch is on (IG) for 1 second or more.

      • Cruise control main switch is on.

      • The power source voltage of the ECM is 10.5 V or more.

      		 Allow the cruise control system to operate for 2.65 seconds or more. - Displays messages on the multi-information display. DTC is stored until it is cleared using the GTS.

    6. ECM (w/ Lexus Safety System +) / GTS Display "Radar Cruise1"


      Powertrain > Cruise Control > Trouble Codes

      Tech Tips

      This ECU uses the CAN communication system for DTC communication.

      ECM / GTS Display "Radar Cruise1"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter Multi-information Display DTC Storage Method
      U010087 Lost Communication With ECM/PCM "A" Missing Message The skid control ECU (brake actuator assembly) does not receive data from the ECM for 1 second or more.

      Both conditions are met:


      • The engine switch is on (IG).

      • The radar cruise control system (vehicle control mode) is operating.

      		 Allow the radar cruise control system (vehicle control mode) to operate for 1 second or more. - Displays messages on the multi-information display. DTC is stored until it is cleared using the GTS.
      U012287 Lost Communication with Vehicle Dynamics Control Module Missing Message The ECM does not receive data from the skid control ECU (brake actuator assembly) for 2.65 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG).

      • The radar cruise control system (vehicle control mode) is operating.

      		 Allow the radar cruise control system (vehicle control mode) to operate for 2.65 seconds or more. - Displays messages on the multi-information display. DTC is stored until it is cleared using the GTS.
      U110487 Lost Communication with Driving Support ECU Missing Message The driving support ECU assembly data sent to the ECM, skid control ECU (brake actuator assembly) or millimeter wave radar sensor assembly is lost for 1.02 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG).

      • The radar cruise control system (vehicle control mode) is operating.

      		 Allow the radar cruise control system (vehicle control mode) to operate for 1.02 seconds or more. - Displays messages on the multi-information display. DTC is stored until it is cleared using the GTS.

    7. Skid Control ECU (Brake Actuator Assembly) / GTS Display "ABS/VSC/TRC/EPB"


      Chassis > ABS/VSC/TRC/EPB > Trouble Codes

      Tech Tips


      • This ECU uses the CAN communication system for DTC communication.

      • *1: w/ TFT Meter Type Combination Meter Assembly

      • *2: w/ Optitron Meter Type Combination Meter Assembly

      Skid Control ECU (Brake Actuator Assembly) / GTS Display "ABS/VSC/TRC/EPB"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter Multi-information Display DTC Storage Method
      U0073 Control Module Communication Bus OFF

      One of the following conditions is met:


      • Delayed reception of data from the yaw rate sensor assembly and steering sensor continues for 1 second or more.*1

      • Delayed reception of data from the airbag sensor assembly and steering sensor continues for 1 second or more.*2

      • The following condition occurs 10 times or more within 60 seconds:


        • Delayed reception of data from the yaw rate sensor assembly and steering sensor occurs once or more within 5 seconds.*1

        • Delayed reception of data from the airbag sensor assembly and steering sensor occurs once or more within 5 seconds.*2

      • The skid control ECU (brake actuator assembly) cannot send or receive data (the bus is off) 10 times consecutively.

      Both conditions are met:


      • The engine switch is on (IG) for 1 second or more.

      • The power source voltage (+BS terminal voltage) of the skid control ECU (brake actuator assembly) is between 10 and 17.4 V.

      		 Turn the engine switch on (IG) and wait at least 61 seconds.

      • ABS warning light illuminates.

      • Slip indicator light illuminates.

      		 - DTC is stored until it is cleared using the GTS.
      U0100 Lost Communication with ECM The skid control ECU (brake actuator assembly) does not receive data from the ECM for 2 seconds or more.

      All conditions are met:


      • The engine switch is on (IG) for 1 second or more.

      • Vehicle speed is 15 km/h (9 mph) or more.

      • The power source voltage (+BS terminal voltage) of the skid control ECU (brake actuator assembly) is between 10 and 17.4 V.

      		 Drive the vehicle at a speed of 15 km/h (9 mph) or more for 3 seconds or more. Slip indicator light illuminates. - DTC is stored until it is cleared using the GTS.
      U0124 Lost Communication with Lateral Acceleration Sensor Module

      Either of the following conditions is met:


      • The skid control ECU (brake actuator assembly) does not receive data from the yaw rate sensor assembly*1 or airbag sensor assembly*2 for 1 second or more.

      • The following condition occurs 10 times or more within 60 seconds:


        • The skid control ECU (brake actuator assembly) does not receive data from the yaw rate sensor assembly once or more within 5 seconds.

      Both conditions are met:


      • The engine switch is on (IG) for 1 second or more.

      • The power source voltage (+BS terminal voltage) of the skid control ECU (brake actuator assembly) is between 10 and 17.4 V.

      		 Turn the engine switch on (IG) and wait at least 61 seconds.

      • ABS warning light illuminates.

      • Slip indicator light illuminates.

      		 - DTC is stored until it is cleared using the GTS.
      U0126 Lost Communication with Steering Angle Sensor Module

      Either of the following conditions is met:


      • The skid control ECU (brake actuator assembly) does not receive data from the steering sensor for 1 second or more.

      • The following condition occurs 10 times or more within 60 seconds:


        • The skid control ECU (brake actuator assembly) does not receive data from the steering sensor once or more within 5 seconds.

      Both conditions are met:


      • The engine switch is on (IG) for 1 second or more.

      • The power source voltage (+BS terminal voltage) of the skid control ECU (brake actuator assembly) is between 10 and 17.4 V.

      		 Turn the engine switch on (IG) and wait at least 61 seconds. Slip indicator light illuminates. - DTC is stored until it is cleared using the GTS.

    8. Power Steering ECU Assembly / GTS Display "EMPS"


      Chassis > EMPS > Trouble Codes

      Tech Tips


      • This ECU uses the CAN communication system for DTC communication.

      • *1: w/ Lexus Safety System +

      Power Steering ECU Assembly / GTS Display "EMPS"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter Multi-information Display DTC Storage Method
      U0100 Lost Communication with ECM / PCM "A"

      Both conditions are met:


      • Vehicle speed is 20 km/h (12 mph) or more.

      • The power steering ECU assembly does not receive data from the ECM for 5 minutes or more.

      All conditions are met:


      • The engine switch is on (IG) for 3 seconds or more.

      • Vehicle speed is 20 km/h (12 mph) or more.

      • The power source voltage of the power steering ECU assembly is 9 V or more.

      		 Drive the vehicle at a speed of 20 km/h (12 mph) or more for 5 minutes or more. - - DTC remains stored only while malfunction is occurring.
      U0129 Lost Communication with Brake System Control Module The power steering ECU assembly does not receive data from the skid control ECU (brake actuator assembly) for 2.34 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 3 seconds or more.

      • The power source voltage of the power steering ECU assembly is 9 V or more.

      		 Turn the engine switch on (IG) and wait at least 5.34 seconds. EPS warning light illuminates. - DTC remains stored only while malfunction is occurring.
      U023A*1 Lost Communication with Front Camera Module The power steering ECU assembly does not receive data from the forward recognition camera for 1.34 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 3 seconds or more.

      • The power source voltage of the power steering ECU assembly is 9 V or more.

      		 Turn the engine switch on (IG) and wait at least 4.34 seconds. - - DTC remains stored only while malfunction is occurring.

    9. Main Body ECU (Multiplex Network Body ECU) / GTS Display "Main Body"


      Body Electrical > Main Body > Trouble Codes

      Tech Tips


      • This ECU uses the CAN communication system for DTC communication.

      • *1: w/ Seat Position Memory System

      • *2: w/ Power Back Door System

      • *3: w/o Adaptive High Beam System

      • *4: w/ Panoramic View Monitor System or Parking Assist Monitor System w/o Parallel Parking Assist Function

      • *5: w/ Stop and Start System

      • *6: w/ Option Connector (Bus Buffer ECU)

      • *7: for LHD

      • *8: for RHD

      Main Body ECU (Multiplex Network Body ECU) / GTS Display "Main Body"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter Multi-information Display DTC Storage Method
      U0100 Lost Communication with ECM / PCM "A" The main body ECU (multiplex network body ECU) does not receive data from the ECM for 10 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 10 seconds or more.

      • The power source voltage of the main body ECU (multiplex network body ECU) is 10.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 20 seconds. - - DTC is stored until it is cleared using the GTS.
      U0101 Lost Communication with TCM The main body ECU (multiplex network body ECU) does not receive data from the ECM for 10 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 10 seconds or more.

      • The power source voltage of the main body ECU (multiplex network body ECU) is 10.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 20 seconds. - - DTC is stored until it is cleared using the GTS.
      U0120 Lost Communication with Starter / Generator Control Module The main body ECU (multiplex network body ECU) does not receive data from the certification ECU (smart key ECU assembly) for 10 seconds or more.

      Both conditions are met:


      • Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and 10 seconds or more elapse.

      • The power source voltage of the main body ECU (multiplex network body ECU) is 10.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 20 seconds. - - DTC is stored until it is cleared using the GTS.
      U0129 Lost Communication with Brake System Control Module The main body ECU (multiplex network body ECU) does not receive data from the skid control ECU assembly for 10 seconds or more.

      Both conditions are met:


      • Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and 10 seconds or more elapse.

      • The power source voltage of the main body ECU (multiplex network body ECU) is 10.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 20 seconds. - - DTC is stored until it is cleared using the GTS.
      U0151 Lost Communication with Restraints Control Module The main body ECU (multiplex network body ECU) does not receive data from the airbag sensor assembly for 10 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 10 seconds or more.

      • The power source voltage of the main body ECU (multiplex network body ECU) is 10.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 20 seconds. - - DTC is stored until it is cleared using the GTS.
      U0155 Lost Communication with Instrument Panel Cluster (IPC) Control Module The main body ECU (multiplex network body ECU) does not receive data from the combination meter assembly for 10 seconds or more.

      Both conditions are met:


      • Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and 10 seconds or more elapse.

      • The power source voltage of the main body ECU (multiplex network body ECU) is 10.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 20 seconds. - - DTC is stored until it is cleared using the GTS.
      U0164 Lost Communication with HVAC Control Module The main body ECU (multiplex network body ECU) does not receive data from the air conditioning amplifier assembly for 10 seconds or more.

      Both conditions are met:


      • Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and 10 seconds or more elapse.

      • The power source voltage of the main body ECU (multiplex network body ECU) is 10.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 20 seconds. - - DTC is stored until it is cleared using the GTS.
      U0182 Lost Communication with AFS The main body ECU (multiplex network body ECU) does not receive data from the Headlight ECU sub-assembly LH for 10 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 10 seconds or more.

      • The power source voltage of the main body ECU (multiplex network body ECU) is 10.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 20 seconds. - - DTC is stored until it is cleared using the GTS.
      U0199*1 Lost Communication with ''Door Control Module A''

      • The main body ECU (multiplex network body ECU) does not receive data from the outer mirror control ECU assembly (for front passenger side) for 10 seconds or more.*7

      • The main body ECU (multiplex network body ECU) does not receive data from the outer mirror control ECU assembly (for driver side) for 10 seconds or more.*8

      		 Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and 11 seconds or more elapse. Turn the engine switch on (IG) and wait at least 21 seconds. - - DTC is stored until it is cleared using the GTS.
      U0200*1 Lost Communication with ''Door Control Module B''

      • The main body ECU (multiplex network body ECU) does not receive data from the outer mirror control ECU assembly (for driver side) for 10 seconds or more.*7

      • The main body ECU (multiplex network body ECU) does not receive data from the outer mirror control ECU assembly (for front passenger side) for 10 seconds or more.*8

      		 Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and 11 seconds or more elapse. Turn the engine switch on (IG) and wait at least 21 seconds. - - DTC is stored until it is cleared using the GTS.
      U0208*1 Lost Communication with ''Seat Control Module A''

      • The main body ECU (multiplex network body ECU) does not receive data from the position control ECU and switch assembly LH for 10 seconds or more.*7

      • The main body ECU (multiplex network body ECU) does not receive data from the position control ECU and switch assembly RH for 10 seconds or more.*8

      		 Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and 10 seconds or more elapse. Turn the engine switch on (IG) and wait at least 20 seconds. - - DTC is stored until it is cleared using the GTS.
      U0209*1 Lost Communication with ''Seat Control Module B''

      • The main body ECU (multiplex network body ECU) does not receive data from the position control ECU and switch assembly RH for 10 seconds or more.*7

      • The main body ECU (multiplex network body ECU) does not receive data from the position control ECU and switch assembly LH for 10 seconds or more.*8

      		 Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and 10 seconds or more elapse. Turn the engine switch on (IG) and wait at least 20 seconds. - - DTC is stored until it is cleared using the GTS.
      U0230*2 Lost Communication with Rear Gate Module The main body ECU (multiplex network body ECU) does not receive data from the multiplex network door ECU for 10 seconds or more.

      Both conditions are met:


      • Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and 10 seconds or more elapse.

      • The power source voltage of the main body ECU (multiplex network body ECU) is 10.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 20 seconds. - - DTC is stored until it is cleared using the GTS.
      U023A*3 Lost Communication with Image Processing Module "A" The main body ECU (multiplex network body ECU) does not receive data from the forward recognition camera for 10 seconds or more.

      Both conditions are met:


      • Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and 10 seconds or more elapse.

      • The power source voltage of the main body ECU (multiplex network body ECU) is 10.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 20 seconds. Adaptive high beam indicator light blinks. - DTC is stored until it is cleared using the GTS.
      U0265*4 Lost Communication with Parking Assist Monitor Module The main body ECU (multiplex network body ECU) does not receive data from the rear television camera assembly for 10 seconds or more.

      Both conditions are met:


      • Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and 10 seconds or more elapse.

      • The power source voltage of the main body ECU (multiplex network body ECU) is 10.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 20 seconds. - - DTC is stored until it is cleared using the GTS.
      U0327 Software Incompatibility with Vehicle Security Control Module The main body ECU (multiplex network body ECU) does not receive data from the certification ECU (smart key ECU assembly) for 10 seconds or more.

      Both conditions are met:


      • Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and 10 seconds or more elapse.

      • The power source voltage of the main body ECU (multiplex network body ECU) is 10.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 20 seconds. - - DTC is stored until it is cleared using the GTS.
      U1002 Lost Communication with Gateway Module (Main body) The main body ECU (multiplex network body ECU) detects communication errors between itself and the position control ECU and switch assembly LH, position control ECU and switch assembly RH, outer mirror control ECU assembly (for front passenger side), outer mirror control ECU assembly (for driver side), multiplex network door ECU and multiplex tilt and telescopic ECU.

      Both conditions are met:


      • Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and 10 seconds or more elapse.

      • The power source voltage of the main body ECU (multiplex network body ECU) is 10.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 20 seconds. - - DTC is stored until it is cleared using the GTS.
      U1103*5 Lost Communication with Stop and Start Control Module The main body ECU (multiplex network body ECU) does not receive data from the engine stop and start ECU for 10 seconds or more.

      Both conditions are met:


      • Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and 10 seconds or more elapse.

      • The power source voltage of the main body ECU (multiplex network body ECU) is 10.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 20 seconds. - - DTC is stored until it is cleared using the GTS.
      U1115 Lost Communication with Tilt & Telescopic Module The main body ECU (multiplex network body ECU) does not receive data from the multiplex tilt and telescopic ECU for 10 seconds or more. Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and 11 seconds or more elapse. Turn the engine switch on (IG) and wait at least 20 seconds. - - DTC is stored until it is cleared using the GTS.
      U1117*6 Lost Communication with Accessory Gateway The main body ECU (multiplex network body ECU) does not receive data from the option connector (bus buffer ECU) for 10 seconds or more.

      Both conditions are met:


      • Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and 10 seconds or more elapse.

      • The power source voltage of the main body ECU (multiplex network body ECU) is 10.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 20 seconds. - - DTC is stored until it is cleared using the GTS.

    10. Certification ECU (Smart Key ECU Assembly) / GTS Display "Entry&Start"


      Body Electrical > Entry&Start > Trouble Codes

      Tech Tips


      • This ECU uses the CAN communication system for DTC communication.

      • *1: w/ Stop and Start System

      • *2: Option Connector (Bus Buffer ECU)

      Certification ECU (Smart Key ECU Assembly) / GTS Display "Entry&Start"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter Multi-information Display DTC Storage Method
      U0100 Lost Communication with ECM / PCM "A" The certification ECU (smart key ECU assembly) does not receive data from the ECM for 10 seconds or more.

      Both conditions are met:


      • Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and 10 seconds or more elapse.

      • The power source voltage of the certification ECU (smart key ECU assembly) is 10 V or more.

      		 Turn the engine switch on (IG) and wait at least 20 seconds. - - DTC is stored until it is cleared using the GTS.
      U0142 Lost Communication with Body Control Module "B" The certification ECU (smart key ECU assembly) does not receive data from the main body ECU (multiplex network body ECU) for 10 seconds or more.

      Both conditions are met:


      • Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and 10 seconds or more elapse.

      • The power source voltage of the certification ECU (smart key ECU assembly) is 10 V or more.

      		 Turn the engine switch on (IG) and wait at least 20 seconds. - - DTC is stored until it is cleared using the GTS.
      U0155 Lost Communication with Instrument Panel Cluster (IPC) Control Module The certification ECU (smart key ECU assembly) does not receive data from the combination meter assembly for 10 seconds or more.

      Both conditions are met:


      • Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and 10 seconds or more elapse.

      • The power source voltage of the certification ECU (smart key ECU assembly) is 10 V or more.

      		 Turn the engine switch on (IG) and wait at least 20 seconds. - - DTC is stored until it is cleared using the GTS.
      U1103*1 Lost Communication with Stop and Start Control Module The certification ECU (smart key ECU assembly) does not receive data from the engine stop and start ECU for 10 seconds or more.

      Both conditions are met:


      • Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and 10 seconds or more elapse.

      • The power source voltage of the certification ECU (smart key ECU assembly) is 10 V or more.

      		 Turn the engine switch on (IG) and wait at least 20 seconds. - - DTC is stored until it is cleared using the GTS.
      U1117*2 Lost Communication with Accessory Gateway The certification ECU (smart key ECU assembly) does not receive data from the option connector (bus buffer ECU) for 10 seconds or more.

      Both conditions are met:


      • Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and 10 seconds or more elapse.

      • The power source voltage of the certification ECU (smart key ECU assembly) is 10 V or more.

      		 Turn the engine switch on (IG) and wait at least 20 seconds. - - DTC is stored until it is cleared using the GTS.

    11. Certification ECU (Smart Key ECU Assembly) / GTS Display "Power Source Control"


      Body Electrical > Power Source Control > Trouble Codes

      Tech Tips


      • This ECU uses the CAN communication system for DTC communication.

      • *1: w/ Stop and Start System

      • *2: Option Connector (Bus Buffer ECU)

      Certification ECU (Smart Key ECU Assembly) / GTS Display "Power Source Control"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter Multi-information Display DTC Storage Method
      U0100 Lost Communication with ECM Communication The certification ECU (smart key ECU assembly) does not receive data from the ECM for 3.1 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG).

      • The power source voltage of the certification ECU (smart key ECU assembly) is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 3.1 seconds. - - DTC is stored until it is cleared using the GTS.
      U0140 Lost Communication with Body Control Module The certification ECU (smart key ECU assembly) does not receive data from the main body ECU (multiplex network body ECU) for 3 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG).

      • The power source voltage of the certification ECU (smart key ECU assembly) is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 3 seconds. - - DTC is stored until it is cleared using the GTS.
      U0155 Lost Communication with Instrument Panel Cluster (IPC) Control Module The certification ECU (smart key ECU assembly) does not receive data from the combination meter assembly for 3.1 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG).

      • The power source voltage of the certification ECU (smart key ECU assembly) is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 3.1 seconds. - - DTC is stored until it is cleared using the GTS.
      U1103*1 Lost Communication with Stop and Start Control Module Missing Message The certification ECU (smart key ECU assembly) does not receive data from the engine stop and start ECU for 5 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG).

      • The power source voltage of the certification ECU (smart key ECU assembly) is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 5 seconds. - - DTC is stored until it is cleared using the GTS.
      U1117*2 Lost Communication with Accessory Gateway The certification ECU (smart key ECU assembly) does not receive data from the option connector (bus buffer ECU) for 5 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG).

      • The power source voltage of the certification ECU (smart key ECU assembly) is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 5 seconds. - - DTC is stored until it is cleared using the GTS.

    12. Certification ECU (Smart Key ECU Assembly) / GTS Display "Starting Control"


      Body Electrical > Starting Control > Trouble Codes

      Tech Tips

      This ECU uses the CAN communication system for DTC communication.

      Certification ECU (Smart Key ECU Assembly) / GTS Display "Starting Control"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter Multi-information Display DTC Storage Method
      U0100 Lost Communication with ECM / PCM "A" The certification ECU (smart key ECU assembly) does not receive data from the ECM for 2 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG).

      • The power source voltage of the certification ECU (smart key ECU assembly) is 10.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 2 seconds. - - DTC remains stored only while malfunction is occurring.

    13. Air Conditioning Amplifier Assembly / GTS Display "Air Conditioner"


      Body Electrical > Air Conditioner > Trouble Codes

      Tech Tips

      This ECU uses the CAN communication system for DTC communication.

      Air Conditioning Amplifier Assembly / GTS Display "Air Conditioner"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter Multi-information Display DTC Storage Method
      U0100 Lost Communication with ECM The air conditioning amplifier assembly does not receive data from the ECM for 7.5 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG).

      • The power source voltage of the air conditioning amplifier assembly is 10 V or more.

      		 Turn the engine switch on (IG) and wait at least 7.5 seconds. - - DTC is stored until it is cleared using the GTS.
      U0131 Lost Communication with Electric Power Steering ECU The air conditioning amplifier assembly does not receive data from the power steering ECU assembly for 5 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG).

      • The power source voltage of the air conditioning amplifier assembly is 10 V or more.

      		 Turn the engine switch on (IG) and wait at least 5 seconds. - - DTC is stored until it is cleared using the GTS.
      U0142 Lost Communication with Main Body ECU The air conditioning amplifier assembly does not receive data from the main body ECU (multiplex network body ECU) for 5 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG).

      • The power source voltage of the air conditioning amplifier assembly is 10 V or more.

      		 Turn the engine switch on (IG) and wait at least 5 seconds. - - DTC is stored until it is cleared using the GTS.
      U0151 Lost Communication with Restraints Control Module The air conditioning amplifier assembly does not receive data from the airbag sensor assembly for 5 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG).

      • The power source voltage of the air conditioning amplifier assembly is 10 V or more.

      		 Turn the engine switch on (IG) and wait at least 5 seconds. - - DTC is stored until it is cleared using the GTS.
      U0155 Lost Communication with Combination Meter The air conditioning amplifier assembly does not receive data from the combination meter assembly for 5 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG).

      • The power source voltage of the air conditioning amplifier assembly is 10 V or more.

      		 Turn the engine switch on (IG) and wait at least 5 seconds. - - DTC is stored until it is cleared using the GTS.
      U0163 Lost Communication with Navigation Control Module The air conditioning amplifier assembly does not receive data from the radio receiver assembly for 5 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG).

      • The power source voltage of the air conditioning amplifier assembly is 10 V or more.

      		 Turn the engine switch on (IG) and wait at least 5 seconds. - - DTC is stored until it is cleared using the GTS.

    14. Telematics Transceiver (w/ Manual (SOS) Switch (for G-BOOK)) / GTS Display "Navigation System"


      Body Electrical > Navigation System > Trouble Codes

      Tech Tips

      This ECU uses the CAN communication system for DTC communication.

      Telematics Transceiver / GTS Display "Navigation System"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter Multi-information Display DTC Storage Method
      U0140 Lost Communication with Body Control Module The telematics transceiver does not receive data from the main body ECU (multiplex network body ECU) for 10 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG).

      • The power source voltage of the telematics transceiver is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 10 seconds. - - DTC is stored until it is cleared using the GTS.
      U0155 Meter ECU Communication The telematics transceiver does not receive data from the combination meter assembly for 10 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 10 seconds or more.

      • The power source voltage of the telematics transceiver is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 20 seconds. - - DTC is stored until it is cleared using the GTS.
      U0198 Lost Communication with Telematic Control Module The telematics transceiver does not receive data from the radio receiver assembly for 10 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG).

      • The power source voltage of the telematics transceiver is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 10 seconds. - - DTC is stored until it is cleared using the GTS.

    15. Telematics Transceiver (w/ Manual (SOS) Switch (except G-BOOK)) / GTS Display "Telematics"


      Body Electrical > Telematics > Trouble Codes

      Tech Tips

      This ECU uses the CAN communication system for DTC communication.

      Telematics Transceiver / GTS Display "Telematics"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter Multi-information Display DTC Storage Method
      U0100 Lost Communication with ECM The telematics transceiver does not receive data from the ECM for 15 seconds or more. The engine switch is on (IG) for 10 seconds or more. Turn the engine switch on (IG) and wait at least 25 seconds. - - DTC is stored until it is cleared using the GTS.

    16. Radio Receiver Assembly (w/ Navigation System) / GTS Display "Navigation System"


      Body Electrical > Navigation System > Trouble Codes

      Tech Tips


      • This ECU uses the CAN communication system for DTC communication.

      • *1: w/ Parking Assist Monitor System with Parallel Parking Assist Function

      • *2: w/ Manual (SOS) Switch (for G-BOOK)

      • *3: w/ Blind Spot Monitor System

      • *4: w/ LEXUS Parking Assist-sensor System

      Radio Receiver Assembly / GTS Display "Navigation System"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter Multi-information Display DTC Storage Method
      U0073 Sending Malfunction (Navigation to APGS) The radio receiver assembly does not send/receive data for 5 seconds or more. The engine switch is on (IG). Turn the engine switch on (IG) and wait at least 6 seconds. - - DTC is stored until it is cleared using the GTS.
      U0100 Engine ECU Communication The radio receiver assembly does not receive data from the ECM for 10 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 1 second or more.

      • The power source voltage of the radio receiver assembly is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 11 seconds. - - DTC is stored until it is cleared using the GTS.
      U0126*1 Steering Sensor Communication The radio receiver assembly does not receive data from the steering sensor for 10.08 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 1 second or more.

      • The power source voltage of the radio receiver assembly is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 11.08 seconds. - - DTC is stored until it is cleared using the GTS.
      U0129 VSC (ECB) ECU Communication The radio receiver assembly does not receive data from the skid control ECU (brake actuator assembly) for 4 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 1 second or more.

      • The power source voltage of the radio receiver assembly is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 5 seconds. - - DTC is stored until it is cleared using the GTS.
      U0140 Lost Communication with Body Control Module The radio receiver assembly does not receive data from the main body ECU (multiplex network body ECU) for 3 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 1 second or more.

      • The power source voltage of the radio receiver assembly is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 4 seconds. - - DTC is stored until it is cleared using the GTS.
      U0155 Meter ECU Communication The radio receiver assembly does not receive data from the combination meter assembly for 30 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 1 second or more.

      • The power source voltage of the radio receiver assembly is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 31 seconds. - - DTC is stored until it is cleared using the GTS.
      U0163 Lost Communication with Navigation Control Module The radio receiver assembly does not receive data from the telematics transceiver for 3 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG).

      • The power source voltage of the radio receiver assembly is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 3 seconds. - - DTC is stored until it is cleared using the GTS.
      U0164 Air Conditioner ECU Communication The radio receiver assembly does not receive data from the air conditioning amplifier assembly for 15 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG).

      • The power source voltage of the radio receiver assembly is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 15 seconds. - - DTC remains stored only while malfunction is occurring.
      U0198*2 Lost Communication with Telematic Control Module The radio receiver assembly does not receive data from the telematics transceiver for 3 seconds or more. The engine switch is on (ACC). Turn the engine switch on (ACC) and wait at least 3 seconds. - - DTC is stored until it is cleared using the GTS.
      U0233*3 Lost Communication with Blind Spot Monitor Master Module The radio receiver assembly does not receive data from the blind spot monitor sensor LH for 10 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 1 second or more.

      • The power source voltage of the radio receiver assembly is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 11 seconds. - - DTC is stored until it is cleared using the GTS.
      U1110*4 Clearance Sonar ECU Communication The radio receiver assembly does not receive data from the clearance warning ECU assembly for 10 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 1 second or more.

      • The power source voltage of the radio receiver assembly is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 11 seconds. - - DTC is stored until it is cleared using the GTS.

    17. Radio Receiver Assembly (w/o Navigation System) / GTS Display "Navigation System"


      Body Electrical > Navigation System > Trouble Codes

      Tech Tips


      • This ECU uses the CAN communication system for DTC communication.

      • *1: w/ Parking Assist Monitor System with Parallel Parking Assist Function

      • *2: w/ Blind Spot Monitor System

      • *3: w/ LEXUS Parking Assist-sensor System

      Radio Receiver Assembly / GTS Display "Navigation System"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter Multi-information Display DTC Storage Method
      U0073 Sending Malfunction (Navigation to APGS) The radio receiver assembly does not send/receive data for 5 seconds or more. The engine switch is on (IG). Turn the engine switch on (IG) and wait at least 5 seconds. - - DTC is stored until it is cleared using the GTS.
      U0100 Engine ECU Communication The radio receiver assembly does not receive data from the ECM for 10 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 1 second or more.

      • The power source voltage of the radio receiver assembly is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 11 seconds. - - DTC is stored until it is cleared using the GTS.
      U0126*1 Steering Sensor Communication The radio receiver assembly does not receive data from the steering sensor for 10.08 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 1 second or more.

      • The power source voltage of the radio receiver assembly is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 11.08 seconds. - - DTC is stored until it is cleared using the GTS.
      U0129 VSC (ECB) ECU Communication The radio receiver assembly does not receive data from the skid control ECU (brake actuator assembly) for 4 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 1 second or more.

      • The power source voltage of the radio receiver assembly is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 5 seconds. - - DTC is stored until it is cleared using the GTS.
      U0140 Lost Communication with Body Control Module The radio receiver assembly does not receive data from the main body ECU (multiplex network body ECU) for 3 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 1 second or more.

      • The power source voltage of the radio receiver assembly is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 4 seconds. - - DTC is stored until it is cleared using the GTS.
      U0155 Meter ECU Communication The radio receiver assembly does not receive data from the combination meter assembly for 30 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 1 second or more.

      • The power source voltage of the radio receiver assembly is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 31 seconds. - - DTC is stored until it is cleared using the GTS.
      U0164 Air Conditioner ECU Communication The radio receiver assembly does not receive data from the air conditioning amplifier assembly for 15 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG).

      • The power source voltage of the radio receiver assembly is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 15 seconds. - - DTC remains stored only while malfunction is occurring.
      U0233*2 Lost Communication with Blind Spot Monitor Master Module The radio receiver assembly does not receive data from the blind spot monitor sensor LH for 10 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 1 second or more.

      • The power source voltage of the radio receiver assembly is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 11 seconds. - - DTC is stored until it is cleared using the GTS.
      U1110*3 Clearance Sonar ECU Communication The radio receiver assembly does not receive data from the clearance warning ECU assembly for 10 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 1 second or more.

      • The power source voltage of the radio receiver assembly is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 11 seconds. - - DTC is stored until it is cleared using the GTS.

    18. Combination Meter Assembly / GTS Display "Combination Meter"


      Body Electrical > Combination Meter > Trouble Codes

      Tech Tips


      • This ECU uses the CAN communication system for DTC communication.

      • *: w/ Lexus Safety System +

      Combination Meter Assembly / GTS Display "Combination Meter"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter Multi-information Display DTC Storage Method
      U0100 Lost Communication with ECM / PCM "A" The combination meter assembly does not receive data from the ECM for 2 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG).

      • The power source voltage of the combination meter assembly is 10.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 2 seconds. MIL illuminates. - DTC is stored until it is cleared using the GTS.
      U0129 Lost Communication with Brake System Control Module The combination meter assembly does not receive data from the skid control ECU (brake actuator assembly) for 3 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG).

      • The power source voltage of the combination meter assembly is 10.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 3 seconds.

      • ABS warning light illuminates.

      • Slip indicator light illuminates.

      • Brake warning light illuminates.

      		 - DTC is stored until it is cleared using the GTS.
      U0131 Lost Communication with Power Steering Control Module The combination meter assembly does not receive data from the power steering ECU assembly for 3 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG).

      • The power source voltage of the combination meter assembly is 10.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 3 seconds. EPS warning light illuminates. - DTC is stored until it is cleared using the GTS.
      U0142 Lost Communication with Body Control Module "B" The combination meter assembly does not receive data from the main body ECU (multiplex network body ECU) for 10 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG).

      • The power source voltage of the combination meter assembly is 10.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 10 seconds. - - DTC is stored until it is cleared using the GTS.
      U0151 Lost Communication with Restraints Control Module The combination meter assembly does not receive data from the airbag sensor assembly for 10 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG).

      • The power source voltage of the combination meter assembly is 10.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 10 seconds. SRS warning light illuminates. - DTC is stored until it is cleared using the GTS.
      U0163 Lost Communication with Navigation Control Module The combination meter assembly does not receive data from the radio receiver assembly for 3 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG).

      • The power source voltage of the combination meter assembly is 10.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 3 seconds. - - DTC is stored until it is cleared using the GTS.
      U0182 Lost Communication with Lighting Control Module Front The combination meter assembly does not receive data from the headlight ECU sub-assembly LH for 10 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG).

      • The power source voltage of the combination meter assembly is 10.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 10 seconds. Displays messages on the multi-information display. - DTC is stored until it is cleared using the GTS.
      U023A* Lost Communication with Front Camera Module The combination meter assembly does not receive data from the forward recognition camera for 10 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG).

      • The power source voltage of the combination meter assembly is 10.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 10 seconds. - - DTC is stored until it is cleared using the GTS.
      U1104* Lost Communication with Driving Support ECU The combination meter assembly does not receive data from the driving support ECU assembly for 10 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG).

      • The power source voltage of the combination meter assembly is 10.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 10 seconds. PCS warning light blinks. - DTC is stored until it is cleared using the GTS.

    19. Outer Mirror Control ECU Assembly (for Front Passenger Side w/ Seat Position Memory System) / GTS Display "Mirror R" (for LHD), "Mirror L" (for RHD)


      Body Electrical > Mirror R > Trouble Codes
      Body Electrical > Mirror L > Trouble Codes

      Tech Tips

      This ECU uses the CAN communication system for DTC communication.

      Outer Mirror Control ECU Assembly (for Front Passenger Side) / GTS Display "Mirror R" (for LHD), "Mirror L" (for RHD)
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter Multi-information Display DTC Storage Method
      U0142 Lost Communication with Body Control Module ''B'' The outer mirror control ECU assembly (for front passenger side) does not receive data from the main body ECU (multiplex network body ECU) for 10 seconds or more.

      Both conditions are met:


      • Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and 10 seconds or more elapse.

      • The power source voltage of the outer mirror control ECU assembly (for front passenger side) is 10 V or more.

      		 Turn the engine switch on (IG) and wait at least 20 seconds. - - DTC is stored until it is cleared using the GTS.

    20. Outer Mirror Control ECU Assembly (for Driver Side w/ Seat Position Memory System) / GTS Display "Mirror L" (for LHD), "Mirror R" (for RHD)


      Body Electrical > Mirror L > Trouble Codes
      Body Electrical > Mirror R > Trouble Codes

      Tech Tips

      This ECU uses the CAN communication system for DTC communication.

      Outer Mirror Control ECU Assembly (for Driver Side) / GTS Display "Mirror L" (for LHD), "Mirror R" (for RHD)
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter Multi-information Display DTC Storage Method
      U0142 Lost Communication with Body Control Module ''B'' The outer mirror control ECU assembly (for driver side) does not receive data from the main body ECU (multiplex network body ECU) for 10 seconds or more.

      Both conditions are met:


      • Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and 10 seconds or more elapse.

      • The power source voltage of the outer mirror control ECU assembly (for driver side) is 10 V or more.

      		 Turn the engine switch on (IG) and wait at least 20 seconds. - - DTC is stored until it is cleared using the GTS.

    21. Multiplex Tilt and Telescopic ECU / GTS Display "Tilt & Telescopic"


      Body Electrical > Tilt&Telescopic > Trouble Codes

      Tech Tips


      • This ECU uses the CAN communication system for DTC communication.

      • *1: w/ Seat Position Memory System

      • *2: for LHD

      • *3: for RHD

      Multiplex Tilt and Telescopic ECU / GTS Display "Tilt & Telescopic"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter Multi-information Display DTC Storage Method
      U0142 Lost Communication with Body ECU The multiplex tilt and telescopic ECU does not receive data from the main body ECU (multiplex network body ECU) for 10 seconds or more.

      Both conditions are met:


      • Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and 10 seconds or more elapse.

      • The power source voltage of the multiplex tilt and telescopic ECU is 10 V or more.

      		 Turn the engine switch on (IG) and wait at least 20 seconds. - - DTC remains stored only while malfunction is occurring.
      U0208*1 Lost Communication with D-Seat ECU

      • The multiplex tilt and telescopic ECU does not receive data from the position control ECU and switch assembly LH for 10 seconds or more.*2

      • The multiplex tilt and telescopic ECU does not receive data from the position control ECU and switch assembly RH for 10 seconds or more.*3

      Both conditions are met:


      • Power source status change (+B OFF → ON, ACC ON ←→ OFF, IG ON ←→ OFF) is detected and 10 seconds or more elapse.

      • The power source voltage of the multiplex tilt and telescopic ECU is 10 V or more.

      		 Turn the engine switch on (IG) and wait at least 20 seconds. - - DTC remains stored only while malfunction is occurring.

    22. Driving Support ECU Assembly (w/ Lexus Safety System +) / GTS Display "Radar Cruise2"


      Powertrain > Radar Cruise2 > Trouble Codes

      Tech Tips


      • This ECU uses the CAN communication system for DTC communication.

      • *1: w/ TFT Meter Type Combination Meter Assembly

      • *2: w/ Optitron Meter Type Combination Meter Assembly

      • *3: Refer to Dynamic Radar Cruise Control System.

        Click here

      Driving Support ECU Assembly / GTS Display "Radar Cruise2"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter Multi-information Display DTC Storage Method
      U0100 Lost Communication with ECM/PCM "A" The driving support ECU assembly does not receive data from the ECM for 0.92 seconds or more.

      All conditions are met:


      • The engine switch is on (IG) for 1 second or more.

      • Vehicle speed is 36 km/h (22 mph) or more.

      • The power source voltage of the driving support ECU assembly is 10 V or more.

      		 Drive the vehicle at a speed of 36 km/h (22 mph) or more for 1.92 seconds or more. - Displays messages on the multi-information display. DTC is stored until it is cleared using the GTS.
      U0125 Lost Communication with Yaw Rate Sensor Module

      • The driving support ECU assembly does not receive data from the yaw rate sensor assembly for 0.72 seconds or more.*1

      • The driving support ECU assembly does not receive data from the airbag sensor assembly for 0.72 seconds or more.*2

      All conditions are met:


      • The engine switch is on (IG) for 3 seconds or more.

      • Vehicle speed is 36 km/h (22 mph) or more.

      • The power source voltage of the driving support ECU assembly is 10 V or more.

      		 Drive the vehicle at a speed of 36 km/h (22 mph) or more for 3.72 seconds or more. - Displays messages on the multi-information display. DTC is stored until it is cleared using the GTS.
      U0126 Lost Communication with Steering Angle Sensor Module The driving support ECU assembly does not receive data from the steering sensor for 0.72 seconds or more.

      All conditions are met:


      • The engine switch is on (IG) for 1 second or more.

      • Vehicle speed is 36 km/h (22 mph) or more.

      • The power source voltage of the driving support ECU assembly is 10 V or more.

      		 Drive the vehicle at a speed of 36 km/h (22 mph) or more for 1.72 seconds or more. - Displays messages on the multi-information display. DTC is stored until it is cleared using the GTS.
      U0129 Lost Communication with Brake System Control Module The driving support ECU assembly does not receive data from the skid control ECU (brake actuator assembly) for 1.08 seconds or more.

      All conditions are met:


      • The engine switch is on (IG) for 2 seconds or more.

      • Vehicle speed is 36 km/h (22 mph) or more.

      • The power source voltage of the driving support ECU assembly is 10 V or more.

      		 Drive the vehicle at a speed of 36 km/h (22 mph) or more for 3.08 seconds or more. - Displays messages on the multi-information display. DTC is stored until it is cleared using the GTS.
      U0235*3 Lost Communication with Cruise Control Front Distance Range Sensor The driving support ECU assembly does not receive data from the millimeter wave radar sensor assembly for 1.6 seconds or more.

      All conditions are met:


      • The engine switch is on (IG) for 1 second or more.

      • Vehicle speed is 36 km/h (22 mph) or more.

      • The power source voltage of the driving support ECU assembly is 10 V or more.

      		 Drive the vehicle at a speed of 36 km/h (22 mph) or more for 2.6 seconds or more. - Displays messages on the multi-information display. DTC is stored until it is cleared using the GTS.
      U1104*3 Lost Communication with Driving Support ECU The driving support ECU assembly does not receive data from the millimeter wave radar sensor assembly for 0.144 seconds or more.

      All conditions are met:


      • The engine switch is on (IG) for 1 second or more.

      • Vehicle speed is 36 km/h (22 mph) or more.

      • The power source voltage of the driving support ECU assembly is 10 V or more.

      		 Drive the vehicle at a speed of 36 km/h (22 mph) or more for 1.144 seconds or more. - Displays messages on the multi-information display. DTC is stored until it is cleared using the GTS.

    23. Driving Support ECU Assembly (w/ Pre-crash Safety System) / GTS Display "Pre-Crash 2"


      Body Electrical > Pre-Crash 2 > Trouble Codes

      Tech Tips


      • This ECU uses the CAN communication system for DTC communication.

      • *1: w/ TFT Meter Type Combination Meter Assembly

      • *2: w/ Optitron Meter Type Combination Meter Assembly

      • *3: Refer to Pre-crash Safety System.

        Click here

      Driving Support ECU Assembly / GTS Display "Pre-Crash 2"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter Multi-information Display DTC Storage Method
      U0100 Lost Communication with ECM/PCM "A" The driving support ECU assembly or skid control ECU (brake actuator assembly) does not receive data from the ECM for 5.12 seconds or more.

      All conditions are met:


      • The engine switch is on (IG) for 1 second or more.

      • Vehicle speed is 5 km/h (3 mph) or more.

      • The power source voltage of the driving support ECU assembly is 10 V or more.

      		 Drive the vehicle at a speed of 5 km/h (3 mph) or more for 5.12 seconds or more. PCS indicator light blinks. Displays messages on the multi-information display. DTC remains stored only while malfunction is occurring.
      U0125 Lost Communication with Yaw Rate Sensor Module

      • The driving support ECU assembly does not receive data from the yaw rate sensor assembly for 0.72 seconds or more.*1

      • The driving support ECU assembly does not receive data from the airbag sensor assembly for 0.72 seconds or more.*2

      Both conditions are met:


      • The engine switch is on (IG) for 3 seconds or more.

      • The power source voltage of the driving support ECU assembly is 10 V or more.

      		 Turn the engine switch on (IG) and wait at least 3.72 seconds. PCS indicator light blinks. Displays messages on the multi-information display. DTC remains stored only while malfunction is occurring.
      U0126 Lost Communication with Steering Angle Sensor Module The driving support ECU assembly does not receive data from the steering sensor for 5.04 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 1 second or more.

      • The power source voltage of the driving support ECU assembly is 10 V or more.

      		 Turn the engine switch on (IG) and wait at least 6.04 seconds. PCS indicator light blinks. Displays messages on the multi-information display. DTC remains stored only while malfunction is occurring.
      U0129 Lost Communication with Brake System Control Module The driving support ECU assembly does not receive data from the skid control ECU (brake actuator assembly) for 4.92 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 2 seconds or more.

      • The power source voltage of the driving support ECU assembly is 10 V or more.

      		 Turn the engine switch on (IG) and wait at least 6.92 seconds. PCS indicator light blinks. Displays messages on the multi-information display. DTC remains stored only while malfunction is occurring.
      U0235*3 Lost Communication with Cruise Control Front Distance Range Sensor The driving support ECU assembly does not receive data from the millimeter wave radar sensor assembly for 0.3 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 3 seconds or more.

      • The power source voltage of the driving support ECU assembly is 10 V or more.

      		 Turn the engine switch on (IG) and wait for at least 3.3 seconds. PCS indicator light blinks. Displays messages on the multi-information display. DTC remains stored only while malfunction is occurring.
      U023A*3 Lost Communication with Image Processing Module "A" The driving support ECU assembly does not receive data from the forward recognition camera for 3 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 3 seconds or more.

      • The power source voltage of the driving support ECU assembly is 10 V or more.

      		 Turn the engine switch on (IG) and wait for at least 6 seconds. PCS indicator light blinks. Displays messages on the multi-information display. DTC remains stored only while malfunction is occurring.
      U1002*3 Lost Communication with Gateway Module The driving support ECU assembly does not receive data from the millimeter wave radar sensor assembly and forward recognition camera for 0.5 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 1 second or more.

      • The power source voltage of the driving support ECU assembly is 10 V or more.

      		 Turn the engine switch on (IG) and wait at least 1.5 seconds. PCS indicator light blinks. Displays messages on the multi-information display. DTC remains stored only while malfunction is occurring.
      U1104*3 Lost Communication with Driving Support ECU

      Either of the following conditions is met:


      • The millimeter wave radar sensor assembly or forward recognition camera does not receive data from the driving support ECU assembly for 0.224 seconds or more.

      • The skid control ECU (brake actuator assembly) does not receive data from the driving support ECU assembly for 1.456 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 2 seconds or more.

      • The power source voltage of the driving support ECU assembly is 10 V or more.

      		 Turn the engine switch on (IG) and wait at least 3.456 seconds. PCS indicator light blinks. Displays messages on the multi-information display. DTC remains stored only while malfunction is occurring.

    24. Absorber Control ECU (w/ AVS) / GTS Display "Air suspension"


      Chassis > Air suspension > Trouble Codes

      Tech Tips


      • This ECU uses the CAN communication system for DTC communication.

      • *1:w/ TFT Meter Type Combination Meter Assembly

      • *2:w/ Optitron Meter Type Combination Meter Assembly

      • *3: w/ Stop and Start System

      Absorber Control ECU / GTS Display "Air suspension"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter Multi-information Display DTC Storage Method
      U0100 Lost Communication with ECM/PCM "A" The absorber control ECU does not receive data from the ECM for 3 seconds or more.

      All conditions are met:


      • The engine switch is on (IG) for 1 second or more.

      • Vehicle speed is 30 km/h (19 mph) or more.

      • The power source voltage of the absorber control ECU is 10 V or more.

      		 Drive the vehicle at a speed of 30 km/h (19 mph) or more for 3 seconds or more. - - DTC is stored until it is cleared using the GTS.
      U0101 Lost Communication with TCM The absorber control ECU does not receive data from the ECM for 6 seconds or more.

      All conditions are met:


      • The engine switch is on (IG) for 1 second or more.

      • Vehicle speed is 30 km/h (19 mph) or more.

      • The power source voltage of the absorber control ECU is 10 V or more.

      		 Drive the vehicle at a speed of 30 km/h (19 mph) or more for 6 seconds or more. - - DTC is stored until it is cleared using the GTS.
      U0122 Lost Communication with Vehicle Dynamics Control Module The absorber control ECU does not receive data from the skid control ECU (brake actuator assembly) for 3 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 2 seconds or more.

      • The power source voltage of the absorber control ECU is 10 V or more.

      		 Turn the engine switch on (IG) and wait at least 5 seconds. - - DTC is stored until it is cleared using the GTS.
      U0124 Lost Communication with Lateral Acceleration Sensor Module

      • The absorber control ECU does not receive data from the yaw rate sensor assembly for 3 seconds or more.*1

      • The absorber control ECU does not receive data from the airbag sensor assembly for 3 seconds or more.*2

      Both conditions are met:


      • The engine switch is on (IG) for 1 second or more.

      • The power source voltage of the absorber control ECU is 10 V or more.

      		 Turn the engine switch on (IG) and wait at least 4 seconds. - - DTC is stored until it is cleared using the GTS.
      U0126 Lost Communication with Steering Angle Sensor Module The absorber control ECU does not receive data from the steering sensor for 3 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 1 second or more.

      • The power source voltage of the absorber control ECU is 10 V or more.

      		 Turn the engine switch on (IG) and wait at least 4 seconds. - - DTC is stored until it is cleared using the GTS.
      U1103*3 Lost Communication with Stop and Start Control Module The absorber control ECU does not receive data from the engine stop and start ECU for 3 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 1 second or more.

      • Vehicle speed is 30 km/h (19 mph) or more.

      		 Drive the vehicle at a speed of 30 km/h (19 mph) or more for 3 seconds or more. - - DTC is stored until it is cleared using the GTS.

    25. Clearance Warning ECU Assembly (w/ LEXUS Parking Assist-sensor System (w/o Intelligent Clearance Sonar System)) / GTS Display "IPA/ICS/Clearance Sonar"


      Body Electrical > IPA/ICS/Clearance Sonar > Trouble Codes

      Tech Tips


      • This ECU uses the CAN communication system for DTC communication.

      • *: Refer to LEXUS Parking Assist-sensor System (w/o Intelligent Clearance Sonar System).

        Click here

      Clearance Warning ECU Assembly / GTS Display "IPA/ICS/Clearance Sonar"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter Multi-information Display DTC Storage Method
      U0073 Control Module Communication Bus "A" Off

      Either of the following conditions is met:


      • The clearance warning ECU assembly does not receive data from an ECU or sensor to which it sent data, for 1.24 seconds or more.

      • The clearance warning ECU assembly does not send/receive data consecutively 10 times or more within 5 seconds.

      Both conditions are met:


      • The engine switch is on (IG) for 3 seconds or more.

      • The power source voltage of the clearance warning ECU assembly is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 8 seconds. - Displays messages on the multi-information display. DTC is stored until it is cleared using the GTS.
      U0155 Lost Communication with Instrument Panel Cluster (IPC) Control Module The clearance warning ECU assembly does not receive data from the combination meter assembly for 5 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 3 seconds or more.

      • The power source voltage of the clearance warning ECU assembly is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 8 seconds. - - DTC is stored until it is cleared using the GTS.
      U1000* CAN Communication Failure (Message Registry) CAN communication malfunction (message register)

      Both conditions are met:


      • The engine switch is on (IG) for 3 seconds or more.

      • The power source voltage of the clearance warning ECU assembly is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 3 seconds. - Displays messages on the multi-information display. DTC is stored until it is cleared using the GTS.

    26. Clearance Warning ECU Assembly (w/ LEXUS Parking Assist-sensor System (w/ Intelligent Clearance Sonar System)) / GTS Display "IPA/ICS/Clearance Sonar"


      Body Electrical > IPA/ICS/Clearance Sonar > Trouble Codes

      Tech Tips


      • This ECU uses the CAN communication system for DTC communication.

      • *1: Refer to Intelligent Clearance Sonar System.

        Click here

      • *2: Refer to LEXUS Parking Assist-sensor System (w/ Intelligent Clearance Sonar System).

        Click here

      Clearance Warning ECU Assembly / GTS Display "IPA/ICS/Clearance Sonar"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter Multi-information Display DTC Storage Method
      U0073 Control Module Communication Bus "A" Off

      Either of the following conditions is met:


      • The clearance warning ECU does not receive data from an ECU or sensor to which it sent data, for 1.24 seconds or more.

      • The clearance warning ECU assembly does not send/receive data consecutively 10 times or more within 5 seconds.

      Both conditions are met:


      • The engine switch is on (IG) for 3 seconds or more.

      • The power source voltage of the clearance warning ECU assembly is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 8 seconds. ICS OFF indicator light blinks. Displays messages on the multi-information display. DTC is stored until it is cleared using the GTS.
      U0100 Lost Communication with ECM/PCM "A" The clearance warning ECU assembly does not receive data from the ECM for 5.12 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 3 seconds or more.

      • The power source voltage of the clearance warning ECU assembly is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 8.12 seconds. ICS OFF indicator light blinks. Displays messages on the multi-information display. DTC is stored until it is cleared using the GTS.
      U0124 Lost Communication with Lateral Acceleration Sensor Module The clearance warning ECU assembly does not receive data from the yaw rate sensor assembly for 0.72 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 3 seconds or more.

      • The power source voltage of the clearance warning ECU assembly is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 3.72 seconds. ICS OFF indicator light blinks. Displays messages on the multi-information display. DTC is stored until it is cleared using the GTS.
      U0126 Lost Communication with Steering Angle Sensor Module The clearance warning ECU assembly does not receive data from the steering sensor for 5.04 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 3 seconds or more.

      • The power source voltage of the clearance warning ECU assembly is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 8.04 seconds. ICS OFF indicator light blinks. Displays messages on the multi-information display. DTC is stored until it is cleared using the GTS.
      U0129 Lost Communication with Brake System Control Module The clearance warning ECU assembly does not receive data from the skid control ECU (brake actuator assembly) for 4.92 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 3 seconds or more.

      • The power source voltage of the clearance warning ECU assembly is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 7.92 seconds. ICS OFF indicator light blinks. Displays messages on the multi-information display. DTC is stored until it is cleared using the GTS.
      U0140 Lost Communication with Body Control Module The clearance warning ECU assembly does not receive data from the main body ECU (multiplex network body ECU) for 5 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 3 seconds or more.

      • The power source voltage of the clearance warning ECU assembly is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 8 seconds. - - DTC is stored until it is cleared using the GTS.
      U0151 Lost Communication with Restraints Control Module (Air Bag) The clearance warning ECU assembly does not receive data from the airbag sensor assembly for 0.72 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 3 seconds or more.

      • The power source voltage of the clearance warning ECU assembly is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 3.72 seconds. ICS OFF indicator light blinks. Displays messages on the multi-information display. DTC is stored until it is cleared using the GTS.
      U0155 Lost Communication with Instrument Panel Cluster (IPC) Control Module The clearance warning ECU assembly does not receive data from the combination meter assembly for 5 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 3 seconds or more.

      • The power source voltage of the clearance warning ECU assembly is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 8 seconds. - - DTC is stored until it is cleared using the GTS.
      U0164 Lost Communication with HVAC Control Module The clearance warning ECU assembly does not receive data from the air conditioning amplifier assembly for 5 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 3 seconds or more.

      • The power source voltage of the clearance warning ECU assembly is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 8 seconds. - - DTC is stored until it is cleared using the GTS.
      U0232*1 Lost Communication with Blind Spot Monitor Slave Module The clearance warning ECU assembly does not receive data from the blind spot monitor sensor RH for 5 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 3 seconds or more.

      • The power source voltage of the clearance warning ECU assembly is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 8 seconds. ICS OFF indicator light blinks. Displays messages on the multi-information display. DTC is stored until it is cleared using the GTS.
      U0233*1 Lost Communication with Blind Spot Monitor Master Module The clearance warning ECU assembly does not receive data from the blind spot monitor sensor LH for 5 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 3 seconds or more.

      • The power source voltage of the clearance warning ECU assembly is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 8 seconds. ICS OFF indicator light blinks. Displays messages on the multi-information display. DTC is stored until it is cleared using the GTS.
      U1000*2 CAN Communication Failure (Message Registry) CAN communication malfunction (message register)

      Both conditions are met:


      • The engine switch is on (IG) for 3 seconds or more.

      • The power source voltage of the clearance warning ECU assembly is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 3 seconds. ICS OFF indicator light blinks. Displays messages on the multi-information display. DTC is stored until it is cleared using the GTS.
      U1103 Lost Communication with Stop and Start Control Module The clearance warning ECU assembly does not receive data from the engine stop and start ECU for 0.76 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 3 seconds or more.

      • The power source voltage of the clearance warning ECU assembly is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 3.76 seconds. - - DTC is stored until it is cleared using the GTS.

    27. Blind Spot Monitor Sensor LH (w/ Blind Spot Monitor System) / GTS Display "Blind Spot Monitor Master"


      Body Electrical > Blind Spot Monitor Master > Trouble Codes

      Tech Tips


      • This ECU uses the CAN communication system for DTC communication.

      • *1: w/ TFT Meter Type Combination Meter Assembly

      • *2: w/ Optitron Meter Type Combination Meter Assembly

      • *3: Refer to Blind Spot Monitor System.

        Click here

      • *4: Refer to Blind Spot Monitor System.

        Click here

      Blind Spot Monitor Sensor LH / GTS Display "Blind Spot Monitor Master"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter Multi-information Display DTC Storage Method
      U0100 Lost Communication with ECM/PCM "A" The blind spot monitor sensor LH does not receive data from the ECM for 10.84 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 1 second or more.

      • The power source voltage of the blind spot monitor sensor LH is 10 V or more.

      		 Turn the engine switch on (IG) and wait for at least 11.84 seconds. - Displays messages on the multi-information display. DTC is stored until it is cleared using the GTS.
      U0125 Lost Communication with Yaw Rate Sensor Module

      • The blind spot monitor sensor LH does not receive data from the yaw rate sensor assembly for 3.06 seconds or more.*1

      • The blind spot monitor sensor LH does not receive data from the airbag sensor assembly for 3.06 seconds or more.*2

      Both conditions are met:


      • The engine switch is on (IG) for 1 second or more.

      • The power source voltage of the blind spot monitor sensor LH is 10 V or more.

      		 Turn the engine switch on (IG) and wait for at least 4.06 seconds. - Displays messages on the multi-information display. DTC is stored until it is cleared using the GTS.
      U0126 Lost Communication with Steering Angle Sensor Module The blind spot monitor sensor LH does not receive data from the steering sensor for 3.06 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 1 second or more.

      • The power source voltage of the blind spot monitor sensor LH is 10 V or more.

      		 Turn the engine switch on (IG) and wait for at least 4.06 seconds. - Displays messages on the multi-information display. DTC is stored until it is cleared using the GTS.
      U0129 Lost Communication with Brake System Control Module The blind spot monitor sensor LH does not receive data from the skid control ECU (brake actuator assembly) for 3.15 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 2 seconds or more.

      • The power source voltage of the blind spot monitor sensor LH is 10 V or more.

      		 Turn the engine switch on (IG) and wait for at least 5.15 seconds. - Displays messages on the multi-information display. DTC is stored until it is cleared using the GTS.
      U0142 Lost Communication with Body Control Module "B" The blind spot monitor sensor LH does not receive data from the main body ECU (multiplex network body ECU) for 10.6 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 1 second or more.

      • The power source voltage of the blind spot monitor sensor LH is 10 V or more.

      		 Turn the engine switch on (IG) and wait for at least 11.6 seconds. - Displays messages on the multi-information display. DTC is stored until it is cleared using the GTS.
      U0232*3 Lost Communication with Blind Spot Monitor Slave Module The blind spot monitor sensor LH does not receive data from the blind spot monitor sensor RH for 10.6 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 1 second or more.

      • The power source voltage of the blind spot monitor sensor LH is 10 V or more.

      		 Turn the engine switch on (IG) and wait for at least 11.6 seconds. - Displays messages on the multi-information display. DTC is stored until it is cleared using the GTS.
      U1331*4 Software Incompatibility with Body Control Module "B" Destination information of the main body ECU (multiplex network body ECU) and blind spot monitor sensor do not match.

      Both conditions are met:


      • The engine switch is on (IG) for 1 second or more.

      • The power source voltage of the blind spot monitor sensor LH is 10 V or more.

      		 Turn the engine switch on (IG) and wait for at least 1 second. - Displays messages on the multi-information display. DTC is stored until it is cleared using the GTS.

    28. Forward Recognition Camera (w/ Lexus Safety System +) / GTS Display "LKA/LDA"


      Chassis > LKA/LDA > Trouble Codes

      Tech Tips


      • This ECU uses the CAN communication system for DTC communication.

      • *1: w/ TFT Meter Type Combination Meter Assembly

      • *2: w/ Optitron Meter Type Combination Meter Assembly

      • *3: Refer to LDA System.

        Click here

      Forward Recognition Camera / GTS Display "LKA/LDA"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter Multi-information Display DTC Storage Method
      U0100 Lost Communication with ECM/PCM "A" The forward recognition camera does not receive data from the ECM for 5 seconds or more.

      All conditions are met:


      • The engine switch is on (IG) for 2 seconds or more.

      • Vehicle speed is 5 km/h (3 mph) or more.

      • The power source voltage of the forward recognition camera is 8 V or more.

      		 Drive the vehicle at a speed of 5 km/h (3 mph) or more for 7 seconds or more. - Displays messages on the multi-information display. DTC remains stored only while malfunction is occurring.
      U0101 Lost Communication with TCM The forward recognition camera does not receive data from the ECM for 5 seconds or more.

      All conditions are met:


      • The engine switch is on (IG) for 2 seconds or more.

      • Vehicle speed is 5 km/h (3 mph) or more.

      • The power source voltage of the forward recognition camera is 8 V or more.

      		 Drive the vehicle at a speed of 5 km/h (3 mph) or more for 7 seconds or more. - Displays messages on the multi-information display. DTC remains stored only while malfunction is occurring.
      U0123 Lost Communication with Yaw Rate Sensor Module

      • The forward recognition camera does not receive data from the yaw rate sensor assembly for 5 seconds or more.*1

      • The forward recognition camera does not receive data from the airbag sensor assembly for 5 seconds or more.*2

      All conditions are met:


      • The engine switch is on (IG) for 2 seconds or more.

      • Vehicle speed is 5 km/h (3 mph) or more.

      • The power source voltage of the forward recognition camera is 10 V or more.

      		 Drive the vehicle at a speed of 5 km/h (3 mph) or more for 7 seconds or more. - Displays messages on the multi-information display. DTC remains stored only while malfunction is occurring.
      U0126 Lost Communication with Steering Angle Sensor Module The forward recognition camera does not receive data from the steering sensor for 0.2 seconds or more.

      All conditions are met:


      • The engine switch is on (IG) for 2 seconds or more.

      • Vehicle speed is 5 km/h (3 mph) or more.

      • The power source voltage of the forward recognition camera is 10 V or more.

      		 Drive the vehicle at a speed of 5 km/h (3 mph) or more for 2.2 seconds or more. - Displays messages on the multi-information display. DTC remains stored only while malfunction is occurring.
      U0129 Lost Communication with Brake System Control Module The forward recognition camera does not receive data from the skid control ECU (brake actuator assembly) for 5 seconds or more.

      All conditions are met:


      • The engine switch is on (IG) for 2 seconds or more.

      • Vehicle speed is 5 km/h (3 mph) or more.

      • The power source voltage of the forward recognition camera is 10 V or more.

      		 Drive the vehicle at a speed of 5 km/h (3 mph) or more for 7 seconds or more. - Displays messages on the multi-information display. DTC remains stored only while malfunction is occurring.
      U0131 Lost Communication with Electric Power Steering Control Module The forward recognition camera does not receive data from the power steering ECU assembly for 5 seconds or more.

      All conditions are met:


      • The engine switch is on (IG) for 2 seconds or more.

      • Vehicle speed is 5 km/h (3 mph) or more.

      • The power source voltage of the forward recognition camera is 10 V or more.

      		 Drive the vehicle at a speed of 5 km/h (3 mph) or more for 7 seconds or more. - Displays messages on the multi-information display. DTC remains stored only while malfunction is occurring.
      U0142 Lost Communication with Body Control Module "B" The forward recognition camera does not receive data from the main body ECU (multiplex network body ECU) for 5 seconds or more.

      All conditions are met:


      • The engine switch is on (IG) for 2 seconds or more.

      • Vehicle speed is 5 km/h (3 mph) or more.

      • The power source voltage of the forward recognition camera is 10 V or more.

      		 Drive the vehicle at a speed of 5 km/h (3 mph) or more for 7 seconds or more. - Displays messages on the multi-information display. DTC remains stored only while malfunction is occurring.
      U0155 Lost Communication with Instrument Panel Cluster (IPC) Control Module (Combination Meter) The forward recognition camera does not receive data from the combination meter assembly for 30 seconds or more.

      All conditions are met:


      • The engine switch is on (IG) for 2 seconds or more.

      • Vehicle speed is 5 km/h (3 mph) or more.

      • The power source voltage of the forward recognition camera is 10 V or more.

      		 Drive the vehicle at a speed of 5 km/h (3 mph) or more for 32 seconds or more. - Displays messages on the multi-information display. DTC remains stored only while malfunction is occurring.
      U0235*3 Lost Communication with Cruise Control Front Distance Range Sensor The forward recognition camera does not receive data from the millimeter wave radar sensor assembly for 5 seconds or more.

      All conditions are met:


      • The engine switch is on (IG) for 2 seconds or more.

      • Vehicle speed is 5 km/h (3 mph) or more.

      • The power source voltage of the forward recognition camera is 10 V or more.

      		 Drive the vehicle at a speed of 5 km/h (3 mph) or more for 7 seconds or more. - Displays messages on the multi-information display. DTC remains stored only while malfunction is occurring.
      U023A*3 Lost Communication with Image Processing Module "A" The forward recognition camera does not receive data from the power steering ECU assembly for 5 seconds or more. The engine switch is on (IG) for 2 seconds or more. Turn the engine switch on (IG) and wait for at least 7 seconds. - Displays messages on the multi-information display. DTC remains stored only while malfunction is occurring.
      U1104*3 Lost Communication with Driving Support ECU The forward recognition camera does not receive data from the driving support ECU assembly for 5 seconds or more.

      All conditions are met:


      • The engine switch is on (IG) for 2 seconds or more.

      • Vehicle speed is 5 km/h (3 mph) or more.

      • The power source voltage of the forward recognition camera is 8 V or more.

      		 Drive the vehicle at a speed of 5 km/h (3 mph) or more for 7 seconds or more. - Displays messages on the multi-information display. DTC remains stored only while malfunction is occurring.

    29. Forward Recognition Camera (w/ Lexus Safety System +) / GTS Display "Front Recognition Camera"


      Chassis > Front Recognition Camera > Trouble Codes

      Tech Tips


      • This ECU uses the CAN communication system for DTC communication.

      • *1: w/ TFT Meter Type Combination Meter Assembly

      • *2: w/ Optitron Meter Type Combination Meter Assembly

      • *3: Refer to Front Recognition Camera System.

        Click here

      Forward Recognition Camera / GTS Display "Front Recognition Camera"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter Multi-information Display DTC Storage Method
      U0100 Lost Communication with ECM/PCM "A" The forward recognition camera does not receive data from the ECM for 5 seconds or more.

      Both conditions are met:


      • Vehicle speed is 1 km/h (or 1 mph) or more.

      • The power source voltage of the forward recognition camera is 10 V or more.

      		 Drive the vehicle at a speed of 1 km/h (or 1 mph) or more for 5 seconds or more. - Displays messages on the multi-information display. DTC is stored until it is cleared using the GTS.
      U0101 Lost Communication with TCM The forward recognition camera does not receive data from the ECM for 5 seconds or more.

      Both conditions are met:


      • Vehicle speed is 1 km/h (or 1 mph) or more.

      • The power source voltage of the forward recognition camera is 10 V or more.

      		 Drive the vehicle at a speed of 1 km/h (or 1 mph) or more for 5 seconds or more. - Displays messages on the multi-information display. DTC is stored until it is cleared using the GTS.
      U0123 Lost Communication with Yaw Rate Sensor Module

      • The forward recognition camera does not receive data from the yaw rate sensor assembly for 5 seconds or more.*1

      • The forward recognition camera does not receive data from the airbag sensor assembly for 5 seconds or more.*2

      Both conditions are met:


      • Vehicle speed is 1 km/h (or 1 mph) or more.

      • The power source voltage of the forward recognition camera is 10 V or more.

      		 Drive the vehicle at a speed of 1 km/h (or 1 mph) or more for 5 seconds or more. - Displays messages on the multi-information display. DTC is stored until it is cleared using the GTS.
      U0129 Lost Communication with Brake System Control Module The forward recognition camera does not receive data from the skid control ECU (brake actuator assembly) for 5 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 2 seconds or more.

      • The power source voltage of the forward recognition camera is 10 V or more.

      		 Turn the engine switch on (IG) and wait at least 7 seconds. - Displays messages on the multi-information display. DTC is stored until it is cleared using the GTS.
      U0142 Lost Communication with Body Control Module "B" The forward recognition camera does not receive data from the main body ECU (multiplex network body ECU) for 5 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 2 seconds or more.

      • The power source voltage of the forward recognition camera is 10 V or more.

      		 Turn the engine switch on (IG) and wait at least 7 seconds. - Displays messages on the multi-information display. DTC is stored until it is cleared using the GTS.
      U0182 Lost Communication with Lighting Control Module Front The forward recognition camera does not receive data from the headlight ECU sub-assembly LH for 5 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 2 seconds or more.

      • The power source voltage of the forward recognition camera is 10 V or more.

      		 Turn the engine switch on (IG) and wait at least 7 seconds. - Displays messages on the multi-information display. DTC is stored until it is cleared using the GTS.
      U0235*3 Lost Communication with Cruise Control Front Distance Range Sensor The forward recognition camera does not receive data from the millimeter wave radar sensor assembly for 1 second or more.

      Both conditions are met:


      • The engine switch is on (IG).

      • The power source voltage of the forward recognition camera is 10 V or more.

      		 Turn the engine switch on (IG) and wait for at least 1 second. - Displays messages on the multi-information display. DTC is stored until it is cleared using the GTS.
      U1104*3 Lost Communication with Driving Support ECU The forward recognition camera does not receive data from the driving support ECU assembly for 1 second or more.

      Both conditions are met:


      • The engine switch is on (IG).

      • The power source voltage of the forward recognition camera is 10 V or more.

      		 Turn the engine switch on (IG) and wait for at least 1 second. - Displays messages on the multi-information display. DTC is stored until it is cleared using the GTS.

    30. Forward Recognition Camera (w/ Road Sign Assist System) / GTS Display "Road Sign Assist"


      Body Electrical > Road Sign Assist > Trouble Codes

      Tech Tips


      • This ECU uses the CAN communication system for DTC communication.

      • *1: w/ TFT Meter Type Combination Meter Assembly

      • *2: w/ Optitron Meter Type Combination Meter Assembly

      Forward Recognition Camera / GTS Display "Road Sign Assist"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter Multi-information Display DTC Storage Method
      U0100 Lost Communication with ECM/PCM "A" The forward recognition camera does not receive data from the ECM for 5 seconds or more.

      All conditions are met:


      • The engine switch is on (IG) for 2 seconds or more.

      • Vehicle speed is 1 km/h (or 1 mph) or more.

      • The power source voltage of the forward recognition camera is 10 V or more.

      		 Drive the vehicle at a speed of 1 km/h (or 1 mph) or more for 7 seconds or more. - Displays messages on the multi-information display. DTC is stored until it is cleared using the GTS.
      U0101 Lost Communication with TCM The forward recognition camera does not receive data from the ECM for 5 seconds or more.

      All conditions are met:


      • The engine switch is on (IG) for 2 seconds or more.

      • Vehicle speed is 1 km/h (or 1 mph) or more.

      • The power source voltage of the forward recognition camera is 10 V or more.

      		 Drive the vehicle at a speed of 1 km/h (or 1 mph) or more for 7 seconds or more. - Displays messages on the multi-information display. DTC is stored until it is cleared using the GTS.
      U0123 Lost Communication with Yaw Rate Sensor Module

      • The forward recognition camera does not receive data from the yaw rate sensor assembly for 5 seconds or more.*1

      • The forward recognition camera does not receive data from the airbag sensor assembly for 5 seconds or more.*2

      All conditions are met:


      • The engine switch is on (IG) for 2 seconds or more.

      • Vehicle speed is 1 km/h (or 1 mph) or more.

      • The power source voltage of the forward recognition camera is 10 V or more.

      		 Drive the vehicle at a speed of 1 km/h (or 1 mph) or more for 7 seconds or more. - Displays messages on the multi-information display. DTC is stored until it is cleared using the GTS.
      U0129 Lost Communication with Brake System Control Module The forward recognition camera does not receive data from the skid control ECU (brake actuator assembly) for 5 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 2 seconds or more.

      • The power source voltage of the forward recognition camera is 10 V or more.

      		 Turn the engine switch on (IG) and wait at least 7 seconds. - Displays messages on the multi-information display. DTC is stored until it is cleared using the GTS.
      U0142 Lost Communication with Body Control Module "B" The forward recognition camera does not receive data from the main body ECU (multiplex network body ECU) for 5 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 2 seconds or more.

      • The power source voltage of the forward recognition camera is 10 V or more.

      		 Turn the engine switch on (IG) and wait at least 7 seconds. - Displays messages on the multi-information display. DTC is stored until it is cleared using the GTS.
      U0155 Lost Communication with Instrument Panel Cluster (IPC) Control Module (Combination Meter) The forward recognition camera does not receive data from the combination meter assembly for 50 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 2 seconds or more.

      • The power source voltage of the forward recognition camera is 10 V or more.

      		 Turn the engine switch on (IG) and wait at least 52 seconds. - Displays messages on the multi-information display. DTC is stored until it is cleared using the GTS.

    31. Headlight ECU Sub-assembly LH (for Single Beam Headlight) / GTS Display "HL AutoLeveling"


      Body Electrical > HL AutoLeveling > Trouble Codes

      Tech Tips


      • This ECU uses the CAN communication system for DTC communication.

      • *: Refer to Lighting System.

        Click here

      Headlight ECU Sub-assembly LH / GTS Display "HL AutoLeveling"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter Multi-information Display DTC Storage Method
      U0073 Control Module Communication Bus Off The headlight ECU sub-assembly LH does not send/receive data.

      Both conditions are met:


      • The engine switch is on (IG) for 3 seconds or more.

      • The power source voltage of the headlight ECU sub-assembly LH is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 13 seconds. - - DTC is stored until it is cleared using the GTS.
      U0100 Lost Communication with ECM/PCM "A" The headlight ECU sub-assembly LH does not receive data from the ECM for 10 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 3 seconds or more.

      • The power source voltage of the headlight ECU sub-assembly LH is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 13 seconds. - - DTC is stored until it is cleared using the GTS.
      U0101 Lost Communication with TCM The headlight ECU sub-assembly LH does not receive data from the ECM for 10 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 3 seconds or more.

      • The power source voltage of the headlight ECU sub-assembly LH is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 13 seconds. - - DTC is stored until it is cleared using the GTS.
      U0126 Lost Communication with Steering Angle Sensor Module The headlight ECU sub-assembly LH does not receive data from the steering sensor for 10 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 3 seconds or more.

      • The power source voltage of the headlight ECU sub-assembly LH is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 13 seconds. - - DTC is stored until it is cleared using the GTS.
      U0129 Lost Communication with Brake System Control Module The headlight ECU sub-assembly LH does not receive data from the skid control ECU (brake actuator assembly) for 10 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 3 seconds or more.

      • The power source voltage of the headlight ECU sub-assembly LH is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 13 seconds. - - DTC is stored until it is cleared using the GTS.
      U0142 Lost Communication with Body Control Module "B" The headlight ECU sub-assembly LH does not receive data from the main body ECU (multiplex network body ECU) for 10 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 3 seconds or more.

      • The power source voltage of the headlight ECU sub-assembly LH is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 13 seconds. - - DTC is stored until it is cleared using the GTS.
      U0155 Lost Communication with Instrument Panel Cluster (IPC) Control Module The headlight ECU sub-assembly LH does not receive data from the combination meter assembly for 30 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 3 seconds or more.

      • The power source voltage of the headlight ECU sub-assembly LH is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 33 seconds. - - DTC is stored until it is cleared using the GTS.
      U0242* Lost Communication with Headlamp Control Module "B" The headlight ECU sub-assembly LH does not receive data from the headlight ECU sub-assembly RH for 10 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 3 seconds or more.

      • The power source voltage of the headlight ECU sub-assembly LH is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 13 seconds. - - DTC is stored until it is cleared using the GTS.
      U1000* CAN Communication Failure (Message Registry) CAN communication malfunction (message register)

      Both conditions are met:


      • The engine switch is on (IG) for 3 seconds or more.

      • The power source voltage of the headlight ECU sub-assembly LH is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 13 seconds. - - DTC is stored until it is cleared using the GTS.

    32. Headlight ECU Sub-assembly LH (for Triple Beam Headlight) / GTS Display "AHS"


      Body Electrical > AFS > Trouble Codes

      Tech Tips


      • For steps in this manual that instruct to select "AFS" on the System Selection Menu on the GTS, select "AHS" instead.

      • This ECU uses the CAN communication system for DTC communication.

      • *: Refer to Lighting System.

        Click here

      Headlight ECU Sub-assembly LH / GTS Display "AHS"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter Multi-information Display DTC Storage Method
      U0073 Control Module Communication Bus Off The headlight ECU sub-assembly LH does not send/receive data.

      Both conditions are met:


      • The engine switch is on (IG) for 3 seconds or more.

      • The power source voltage of the headlight ECU sub-assembly LH is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 3 seconds. - - DTC is stored until it is cleared using the GTS.
      U0100 Lost Communication with ECM/PCM "A" The headlight ECU sub-assembly LH does not receive data from the ECM for 10 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 3 seconds or more.

      • The power source voltage of the headlight ECU sub-assembly LH is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 13 seconds. - - DTC is stored until it is cleared using the GTS.
      U0101 Lost Communication with TCM The headlight ECU sub-assembly LH does not receive data from the ECM for 10 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 3 seconds or more.

      • The power source voltage of the headlight ECU sub-assembly LH is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 13 seconds. - - DTC is stored until it is cleared using the GTS.
      U0126 Lost Communication with Steering Angle Sensor Module The headlight ECU sub-assembly LH does not receive data from the steering sensor for 5 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 3 seconds or more.

      • The power source voltage of the headlight ECU sub-assembly LH is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 8 seconds. - - DTC is stored until it is cleared using the GTS.
      U0129 Lost Communication with Brake System Control Module The headlight ECU sub-assembly LH does not receive data from the skid control ECU (brake actuator assembly) for 5 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 3 seconds or more.

      • The power source voltage of the headlight ECU sub-assembly LH is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 8 seconds. - - DTC is stored until it is cleared using the GTS.
      U0142 Lost Communication with Body Control Module "B" The headlight ECU sub-assembly LH does not receive data from the main body ECU (multiplex network body ECU) for 10 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 3 seconds or more.

      • The power source voltage of the headlight ECU sub-assembly LH is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 13 seconds. - - DTC is stored until it is cleared using the GTS.
      U0155 Lost Communication with Instrument Panel Cluster (IPC) Control Module The headlight ECU sub-assembly LH does not receive data from the combination meter assembly for 10 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 3 seconds or more.

      • The power source voltage of the headlight ECU sub-assembly LH is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 13 seconds. - - DTC is stored until it is cleared using the GTS.
      U023A Lost Communication with Image Processing Module "A" The headlight ECU sub-assembly LH does not receive data from the forward recognition camera for 10 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 3 seconds or more.

      • The power source voltage of the headlight ECU sub-assembly LH is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 13 seconds. - - DTC is stored until it is cleared using the GTS.
      U0242* Lost Communication with Headlamp Control Module "B" The headlight ECU sub-assembly LH does not receive data from the headlight ECU sub-assembly RH for 10 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 3 seconds or more.

      • The power source voltage of the headlight ECU sub-assembly LH is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 13 seconds. - - DTC is stored until it is cleared using the GTS.
      U1000* CAN Communication Failure (Message Registry) When the engine switch is turned on (IG), a CAN communication malfunction is detected.

      Both conditions are met:


      • The engine switch is on (IG) for 3 seconds or more.

      • The power source voltage of the headlight ECU sub-assembly LH is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 3 seconds. - - DTC remains stored only while malfunction is occurring.

    33. Engine Stop and Start ECU (w/ Stop and Start System) / GTS Display "Stop and Start"


      Powertrain > Stop and Start > Trouble Codes

      Tech Tips


      • This ECU uses the CAN communication system for DTC communication.

      • *1: w/ TFT Meter Type Combination Meter Assembly

      • *2: w/ Optitron Meter Type Combination Meter Assembly

      Engine Stop and Start ECU / GTS Display "Stop and Start"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter Multi-information Display DTC Storage Method
      U0100 Lost Communication with ECM/PCM "A" The engine stop and start ECU does not receive data from the ECM for 1 second or more.

      Both conditions are met:


      • The engine switch is on (IG) for 1 second or more.

      • The power source voltage of the engine stop and start ECU is 10.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 2 seconds. Stop and start cancel indicator light blinks. - DTC is stored until it is cleared using the GTS.
      U0121 Lost Communication with Anti-Lock Brake System (ABS) Control Module The engine stop and start ECU does not receive data from the skid control ECU (brake actuator assembly) for 2.2 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 2.1 seconds or more.

      • The power source voltage of the engine stop and start ECU is 10.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 4.3 seconds. Stop and start cancel indicator light blinks. - DTC is stored until it is cleared using the GTS.
      U0123 Lost Communication with Yaw Rate Sensor Control Module

      • The engine stop and start ECU does not receive data from the yaw rate sensor assembly for 1 second or more.*1

      • The engine stop and start ECU does not receive data from the airbag sensor assembly for 1 second or more.*2

      Both conditions are met:


      • The engine switch is on (IG) for 1 second or more.

      • The power source voltage of the engine stop and start ECU is 10.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 2 seconds. Stop and start cancel indicator light blinks. - DTC is stored until it is cleared using the GTS.
      U0126 Lost Communication with Steering Angle Sensor Module The engine stop and start ECU does not receive data from the steering sensor for 1 second or more.

      Both conditions are met:


      • The engine switch is on (IG) for 1 second or more.

      • The power source voltage of the engine stop and start ECU is 10.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 2 seconds. Stop and start cancel indicator light blinks. - DTC is stored until it is cleared using the GTS.
      U0131 Lost Communication with Power Steering Control Module The engine stop and start ECU does not receive data from the power steering ECU assembly for 1 second or more.

      Both conditions are met:


      • The engine switch is on (IG) for 1 second or more.

      • The power source voltage of the engine stop and start ECU is 10.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 2 seconds. Stop and start cancel indicator light blinks. - DTC is stored until it is cleared using the GTS.
      U0140 Lost Communication with J/B ECU The engine stop and start ECU does not receive data from the main body ECU (multiplex network body ECU) assembly for 3.6 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 1 second or more.

      • The power source voltage of the engine stop and start ECU is 10.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 4.6 seconds. Stop and start cancel indicator light blinks. - DTC is stored until it is cleared using the GTS.
      U0151 Lost Communication with SRS Airbag ECU The engine stop and start ECU does not receive data from the airbag sensor assembly for 10.6 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 1 second or more.

      • The power source voltage of the engine stop and start ECU is 10.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 11.6 seconds. Stop and start cancel indicator light blinks. - DTC is stored until it is cleared using the GTS.
      U0164 Lost Communication with HVAC Control Module The engine stop and start ECU does not receive data from the air conditioning amplifier assembly for 10.6 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 1 second or more.

      • The power source voltage of the engine stop and start ECU is 10.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 11.6 seconds. Stop and start cancel indicator light blinks. - DTC is stored until it is cleared using the GTS.

    34. Tire Pressure Warning ECU and Receiver / GTS Display "Tire Pressure Monitor"


      Chassis > Tire Pressure Monitor > Trouble Codes

      Tech Tips

      This ECU uses the CAN communication system for DTC communication.

      Tire Pressure Warning ECU and Receiver / GTS Display "Tire Pressure Monitor"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter Multi-information Display DTC Storage Method
      U0129 Lost Communication with Brake System Control Module The tire pressure warning ECU and receiver does not receive data from the skid control ECU (brake actuator assembly) for 60 seconds or more. The engine switch is on (IG) for 3 seconds or more. Turn the engine switch on (IG) and wait at least 63 seconds. - - DTC remains stored only while malfunction is occurring.

    35. 4WD ECU Assembly (for AWD) / GTS Display "Four Wheel Drive"


      Chassis > Four Wheel Drive > Trouble Codes

      Tech Tips

      This ECU uses the CAN communication system for DTC communication.

      4WD ECU Assembly / GTS Display "Four Wheel Drive"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter Multi-information Display DTC Storage Method
      U0073 Control Module Communication Bus Off The 4WD ECU assembly does not send/receive data for 5 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 1 second or more.

      • The power source voltage of the 4WD ECU assembly is 10 V or more.

      		 Turn the engine switch on (IG) and wait for at least 6 seconds. - Displays messages on the multi-information display. DTC is stored until it is cleared using the GTS.
      U0100 Lost Communication with ECM/PCM "A" The 4WD ECU assembly does not receive data from the ECM for 3.5 seconds or more.

      All conditions are met:


      • The engine switch is on (IG) for 1 second or more.

      • Vehicle speed is 60 km/h (37 mph) or more.

      • The power source voltage of the 4WD ECU assembly is 10 V or more.

      		 Drive the vehicle at a speed of 60 km/h (37 mph) or more for 3.5 seconds or more. - Displays messages on the multi-information display. DTC is stored until it is cleared using the GTS.
      U0126 Lost Communication with Steering Angle Sensor Module

      Either of the following conditions is met:


      • The 4WD ECU assembly does not receive data from the steering sensor for 1 second or more.

      • The following condition occurs 10 times or more within 60 seconds:


        • The 4WD ECU assembly does not receive data from the steering sensor once or more within 5 seconds.

      Both conditions are met:


      • The engine switch is on (IG) for 1 second or more.

      • The power source voltage of the 4WD ECU assembly is 10 V or more.

      		 Turn the engine switch on (IG) and wait for at least 61 seconds. - Displays messages on the multi-information display. DTC is stored until it is cleared using the GTS.
      U0129 Lost Communication with Brake System Control Module The 4WD ECU assembly does not receive data from the skid control ECU (brake actuator assembly) for 8 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 2 seconds or more.

      • The power source voltage of the 4WD ECU assembly is 10 V or more.

      		 Turn the engine switch on (IG) and wait for at least 10 seconds. - Displays messages on the multi-information display. DTC is stored until it is cleared using the GTS.

    36. Parking Assist ECU (w/ Panoramic View Monitor System) / GTS Display "Panoramic View Monitor"


      Chassis > Panoramic View Monitor > Trouble Codes

      Tech Tips


      • This ECU uses the CAN communication system for DTC communication.

      • *: The parking assist ECU stores U1000 if an internal error related to the CAN communication system is detected.

        Click here

      Parking Assist ECU / GTS Display "Panoramic View Monitor"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter Multi-information Display DTC Storage Method
      U0073 Control Module Communication Bus Off The parking assist ECU does not send/receive data for 12.9 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 3 seconds or more.

      • The power source voltage of the parking assist ECU is 7.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 15.9 seconds. - - DTC is stored until it is cleared using the GTS.
      U0100 Lost Communication with ECM/PCM "A" The parking assist ECU does not receive data from the ECM for 11.24 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 3 seconds or more.

      • The power source voltage of the parking assist ECU is 7.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 14.24 seconds. - - DTC is stored until it is cleared using the GTS.
      U0126 Lost Communication with Steering Angle Sensor Module The parking assist ECU does not receive data from the steering sensor for 1.12 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 3 seconds or more.

      • The power source voltage of the parking assist ECU is 7.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 4.12 seconds. - - DTC is stored until it is cleared using the GTS.
      U0129 Lost Communication with Brake System Control Module The parking assist ECU does not receive data from the skid control ECU (brake actuator assembly) for 1.48 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 3 seconds or more.

      • The power source voltage of the parking assist ECU is 7.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 4.48 seconds. - - DTC is stored until it is cleared using the GTS.
      U0140 Lost Communication with Body Control Module The parking assist ECU does not receive data from the main body ECU (multiplex network body ECU) for 11 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 3 seconds or more.

      • The power source voltage of the parking assist ECU is 7.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 14 seconds. - - DTC is stored until it is cleared using the GTS.
      U0163 Lost Communication with Navigation Control Module The parking assist ECU does not receive data from the radio receiver assembly for 11 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 3 seconds or more.

      • The power source voltage of the parking assist ECU is 7.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 14 seconds. - - DTC is stored until it is cleared using the GTS.
      U0233 Lost Communication with Blind Spot Monitor Master Module The parking assist ECU does not receive data from the blind spot monitor sensor LH for 11 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 3 seconds or more.

      • The power source voltage of the parking assist ECU is 7.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 14 seconds. - - DTC is stored until it is cleared using the GTS.
      U0265 Lost Communication with Image Processing Sensor A The parking assist ECU does not receive data from the rear television camera assembly for 2 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 3 seconds or more.

      • The power source voltage of the parking assist ECU is 7.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 5 seconds. - - DTC is stored until it is cleared using the GTS.
      U0266 Lost Communication with Image Processing Sensor B The parking assist ECU does not receive data from the side camera LH (outer rear view mirror assembly LH) for 2 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 3 seconds or more.

      • The power source voltage of the parking assist ECU is 7.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 5 seconds. - - DTC is stored until it is cleared using the GTS.
      U0267 Lost Communication with Image Processing Sensor C The parking assist ECU does not receive data from the front television camera assembly for 2 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 3 seconds or more.

      • The power source voltage of the parking assist ECU is 7.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 5 seconds. - - DTC is stored until it is cleared using the GTS.
      U0268 Lost Communication with Image Processing Sensor D The parking assist ECU does not receive data from the side camera RH (outer rear view mirror assembly RH) for 2 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 3 seconds or more.

      • The power source voltage of the parking assist ECU is 7.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 5 seconds. - - DTC is stored until it is cleared using the GTS.
      U1000* CAN Communication Failure (Message Registry) The parking assist ECU does not send/receive data.

      Both conditions are met:


      • The engine switch is on (IG) for 3 seconds or more.

      • The power source voltage of the parking assist ECU is 7.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 3 seconds. - - DTC is stored until it is cleared using the GTS.
      U1110 Lost Communication with Clearance Sonar Module The parking assist ECU does not receive data from the clearance warning ECU assembly for 11 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 3 seconds or more.

      • The power source voltage of the parking assist ECU is 7.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 14 seconds. - - DTC is stored until it is cleared using the GTS.

    37. Rear Television Camera Assembly (w/ Parking Assist Monitor System w/o Parallel Parking Assist Function) / GTS Display "Parking Assist Camera"


      Chassis > Parking Assist Camera > Trouble Codes

      Tech Tips


      • This ECU uses the CAN communication system for DTC communication.

      • *: The rear television camera assembly stores U1000 if an internal error related to the CAN communication system is detected.

        Click here

      Rear Television Camera Assembly / GTS Display "Parking Assist Camera"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter Multi-information Display DTC Storage Method
      U0100 Lost Communication with ECM / PCM "A" The rear television camera assembly does not receive data from the ECM for 11 seconds or more. The engine switch is on (IG) for 3 seconds or more. Turn the engine switch on (IG) and wait for at least 14 seconds. - - DTC is stored until it is cleared using the GTS.
      U0126 Lost Communication with Steering Angle Sensor Module The rear television camera assembly does not receive data from the steering sensor for 3.036 seconds or more. The engine switch is on (IG) for 3 seconds or more. Turn the engine switch on (IG) and wait for at least 6.036 seconds. - - DTC is stored until it is cleared using the GTS.
      U0129 Lost Communication with Brake System Control Module The rear television camera assembly does not receive data from the skid control ECU (brake actuator assembly) for 11 seconds or more. The engine switch is on (IG) for 3 seconds or more. Turn the engine switch on (IG) and wait for at least 14 seconds. - - DTC is stored until it is cleared using the GTS.
      U0140 Lost Communication with Body Control Module The rear television camera assembly does not receive data from the main body ECU (multiplex network body ECU) for 11 seconds or more. The engine switch is on (ACC) for 3 seconds or more. Turn the engine switch on (ACC) and wait for at least 14 seconds. - - DTC is stored until it is cleared using the GTS.
      U0163 Lost Communication with Navigation Control Module The rear television camera assembly does not receive data from the radio receiver assembly for 11 seconds or more. The engine switch is on (ACC) for 3 seconds or more. Turn the engine switch on (ACC) and wait for at least 14 seconds. - - DTC is stored until it is cleared using the GTS.
      U1000* CAN Communication Failure (Message Registry) When the engine switch is turned on (IG), a CAN communication malfunction is detected. The engine switch is on (IG). Turn the engine switch on (IG). - - DTC remains stored only while malfunction is occurring.
      U1110 Lost Communication with Clearance Sonar Module The rear television camera assembly does not receive data from the clearance warning ECU assembly for 11 seconds or more. The engine switch is on (IG) for 3 seconds or more. Turn the engine switch on (IG) and wait for at least 14 seconds. - - DTC is stored until it is cleared using the GTS.

    38. Combination Meter Mirror ECU (Headup Display) (w/ Headup Display System) / GTS Display "Head Up Display"


      Body Electrical > Head Up Display > Trouble Codes

      Tech Tips

      This ECU uses the CAN communication system for DTC communication.

      Combination Meter Mirror ECU (Headup Display) / GTS Display "Head Up Display"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter Multi-information Display DTC Storage Method
      U0100 Lost Communication with ECM/PCM The combination meter mirror ECU (headup display) does not receive data from the ECM for 2 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 3 seconds or more.

      • The power source voltage of the combination meter mirror ECU (headup display) is 10.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 5 seconds. - - DTC is stored until it is cleared using the GTS.
      U0142 Lost Communication with Body Control Module The combination meter mirror ECU (headup display) does not receive data from the main body ECU (multiplex network body ECU) for 3 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 3 seconds or more.

      • The power source voltage of the combination meter mirror ECU (headup display) is 10.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 6 seconds. - - DTC is stored until it is cleared using the GTS.
      U0163 Lost Communication with Navigation Control Module The combination meter mirror ECU (headup display) does not receive data from the radio receiver assembly for 3 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 3 seconds or more.

      • The power source voltage of the combination meter mirror ECU (headup display) is 10.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 6 seconds. - - DTC is stored until it is cleared using the GTS.
      U023A Lost Communication with Image Processing Module "A" The combination meter mirror ECU (headup display) does not receive data from the forward recognition camera for 10 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 3 seconds or more.

      • The power source voltage of the combination meter mirror ECU (headup display) is 10.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 13 seconds. - - DTC is stored until it is cleared using the GTS.
      U1104 Lost Communication with Driving Support ECU The combination meter mirror ECU (headup display) does not receive data from the driving support ECU assembly for 10 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 3 seconds or more.

      • The power source voltage of the combination meter mirror ECU (headup display) is 10.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 13 seconds. - - DTC is stored until it is cleared using the GTS.

    39. Multiplex Network Door ECU (w/ Power Back Door System) / GTS Display "Back Door"


      Body Electrical > Back Door > Trouble Codes

      Tech Tips


      • DTC communication uses the CAN communication system.

      • *: w/ Option Connector (Bus Buffer ECU)

      Multiplex Network Door ECU / GTS Display "Back Door"
      DTC No. Detection Item DTC Detection Condition DTC Detection Precondition DTC Check Procedure Warning Indication in Meter Multi-information Display DTC Storage Method
      U0101 Lost Communication with TCM The multiplex network door ECU does not receive data from the ECM for 10 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG).

      • The power source voltage of the multiplex network door ECU is 10.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 10 seconds. - - DTC is stored until it is cleared using the GTS.
      U0122 Lost Communication with Vehicle Dynamics Control Module The multiplex network door ECU does not receive data from the skid control ECU (brake actuator assembly) for 10 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG).

      • The power source voltage of the multiplex network door ECU is 10.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 10 seconds. - - DTC is stored until it is cleared using the GTS.
      U0142 Lost Communication with Body Control Module "B" The multiplex network door ECU does not receive data from the main body ECU (multiplex network body ECU) for 10 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG).

      • The power source voltage of the multiplex network door ECU is 10.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 10 seconds. - - DTC is stored until it is cleared using the GTS.
      U0155 Lost Communication with Instrument Panel Cluster (IPC) Control Module The multiplex network door ECU does not receive data from the combination meter assembly for 10 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG).

      • The power source voltage of the multiplex network door ECU is 10.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 10 seconds. - - DTC is stored until it is cleared using the GTS.
      U0327 Software Incompatibility with Vehicle Security Control Module The multiplex network door ECU does not receive data from the certification ECU (smart key ECU assembly) for 10 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG).

      • The power source voltage of the multiplex network door ECU is 10.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 10 seconds. - - DTC is stored until it is cleared using the GTS.
      U1117* Lost Communication with Accessory Gateway The multiplex network door ECU does not receive data from the option connector (bus buffer ECU) for 10 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG).

      • The power source voltage of the multiplex network door ECU is 10.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 10 seconds. - - The DTC remains stored until it is cleared using the GTS.

    40. Occupant Detection ECU (w/ 12.3 Inch Display Type Audio and Visual System) / GTS Display "Occupant Detection"

      Tech Tips


      • This ECU uses the CAN communication system for DTC communication.

      • *1: w/ TFT Meter Type Combination Meter Assembly

      • *2: w/ Optitron Meter Type Combination Meter Assembly


      Body Electrical > Occupant Detection > Trouble Codes
      Occupant Detection ECU / GTS Display "Occupant Detection"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter Multi-information Display DTC Storage Method
      U0125 Lost Communication With Multi-axis Acceleration Sensor Module

      • The occupant detection ECU does not receive data from the yaw rate sensor assembly for 5 seconds or more.*1

      • The occupant detection ECU does not receive data from the airbag sensor assembly for 5 seconds or more.*2

      Both conditions are met:


      • The engine switch is on (IG) for 3 seconds or more.

      • The power source voltage of the occupant detection ECU is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 8 seconds. SRS warning light illuminates. - DTC is stored until it is cleared using the GTS.
      U0129 Lost Communication With Brake System Control Module The occupant detection ECU does not receive data from the skid control ECU (brake actuator assembly) for 5 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 1 second or more.

      • The power source voltage of the occupant detection ECU is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait for at least 6 seconds. SRS warning light illuminates. - DTC is stored until it is cleared using the GTS.

    41. Airbag Sensor Assembly (w/ 12.3 Inch Display Type Audio and Visual System) / GTS Display "SRS Airbag"


      Body Electrical > SRS Airbag > Trouble Codes

      Tech Tips

      This ECU uses the CAN communication system for DTC communication.

      Airbag Sensor Assembly / GTS Display "SRS Airbag"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter Multi-information Display DTC Storage Method
      U0154 Lost Communication with Restraints Occupant Classification System Module The airbag sensor assembly does not receive data from the occupant detection ECU for 5 seconds or more. The engine switch is on (IG) for 1 second or more. Turn the engine switch on (IG) and wait for at least 6 seconds. SRS warning light illuminates. - DTC is stored until it is cleared using the GTS.

    42. Airbag Sensor Assembly (w/ Navigation System or 8 Inch Display Type Audio and Visual System) / GTS Display "SRS Airbag"

      Tech Tips

      The airbag sensor assembly is connected to the CAN communication system, but the network gateway ECU does not store or output CAN communication DTCs.

    43. Steering Sensor

      Tech Tips

      The steering sensor is connected to the CAN communication system, but the steering sensor does not store or output CAN communication DTCs.

    44. Position Control ECU and Switch Assembly LH (w/ Seat Position Memory System) / GTS Display "Driver Seat" (for LHD) or "Passenger Seat" (for RHD)

      Tech Tips

      The position control ECU and switch assembly LH is connected to the CAN communication system, but the position control ECU and switch assembly LH does not store or output CAN communication DTCs.

    45. Position Control ECU and Switch Assembly RH (w/ Seat Position Memory System) / GTS Display "Driver Seat" (for RHD) or "Passenger Seat" (for LHD)

      Tech Tips

      The position control ECU and switch assembly RH is connected to the CAN communication system, but the position control ECU and switch assembly RH does not store or output CAN communication DTCs.

    46. Millimeter Wave Radar Sensor Assembly (w/ Lexus Safety System +)

      Tech Tips

      The millimeter wave radar sensor assembly is connected to the CAN communication system, but the millimeter wave radar sensor assembly does not store or output CAN communication DTCs.

    47. Yaw Rate Sensor Assembly (w/ TFT Meter Type Combination Meter Assembly)

      Tech Tips

      The yaw rate sensor assembly is connected to the CAN communication system, but the yaw rate sensor assembly does not store or output CAN communication DTCs.

    48. Front Television Camera Assembly (w/ Panoramic View Monitor System)

      Tech Tips

      The front television camera assembly is connected to the CAN communication system, but the front television camera assembly does not store or output CAN communication DTCs.

    49. Side Camera LH (Outer Rear View Mirror Assembly LH) (w/ Panoramic View Monitor System)

      Tech Tips

      The side camera LH (outer rear view mirror assembly LH) is connected to the CAN communication system, but the side camera LH (outer rear view mirror assembly LH) does not store or output CAN communication DTCs.

    50. Side Camera RH (Outer Rear View Mirror Assembly RH) (w/ Panoramic View Monitor System)

      Tech Tips

      The side camera RH (outer rear view mirror assembly RH) is connected to the CAN communication system, but the side camera RH (outer rear view mirror assembly RH) does not store or output CAN communication DTCs.

    51. Rear Television Camera Assembly (w/ Panoramic View Monitor System)

      Tech Tips

      The airbag sensor assembly is connected to the CAN communication system, but the network gateway ECU does not store or output CAN communication DTCs.

    52. Network Gateway ECU / GTS Display "Central Gateway"

      Tech Tips

      The network gateway ECU is connected to the CAN communication system, but the network gateway ECU does not store or output CAN communication DTCs.

  5. CAN BUS WAVEFORMS

    B005MN7E05

    Tech Tips


    • The following waveform is measured between terminals CANH and GND, and terminals CANL and GND of the network gateway ECU. (Use this as a reference for diagnosis of CAN communication lines.)

    • When malfunctions in multiple ECUs are suspected based on the CAN bus check and DTCs checked using the GTS, check the resistance of the CAN bus using an ohmmeter first. If no problems are found, check the following waveforms.

      Click here

    • If a waveform is not similar to one of the following 3 patterns (Group 1), then an open in a CAN main bus line, an open in a CAN branch line, or a short between a CAN line (CANH or CANL) and ground is suspected (Group 2).

    • Wiggle the connector and wire harness to check if the waveform changes.


    1. CAN bus waveforms (Group 1)


      1. B005LKQN07
        *a 1 V/DIV.
        *b 50 μs/DIV.

        Normal waveform

      2. B005LEJN05
        *a 1 V/DIV.
        *b 50 μs/DIV.

        Open in both of the lines (CANH and CANL) of a CAN branch

        Tech Tips


        • Waveforms (waveforms shown using dotted lines) are not present from an ECU or sensor connected to a CAN branch with an open circuit in both lines. (Waveforms from other ECUs or sensors are normal.)

        • Because this waveform is similar to a normal waveform, instead of using the waveform, the malfunctioning part can be narrowed down by performing a CAN bus check.

      3. B005PRCN05
        *a 1 V/DIV.
        *b 50 μs/DIV.

        Short between the CAN bus lines (CANH and CANL)

        Tech Tips


        • Waveforms disappear.

        • If the malfunction is in an ECU, disconnecting the ECU will change the waveform. If the waveform does not change, a malfunction in the wire harness is suspected.

    2. CAN bus waveforms (reference) (Group 2)

      Note

      The following CAN bus waveforms can be used only as reference. The actual measured waveform may differ significantly depending on the location of the open or short circuit.


      1. B005OJ0N05
        *a 1 V/DIV.
        *b 50 μs/DIV.

        Open in a CAN branch line (CANH)

        Tech Tips


        • An abnormal waveform is output from an ECU with an open in one of its CAN branch lines. Because this abnormal output interferes with the signals from other ECUs, the output of other ECUs will also appear abnormal.

        • Narrow down the malfunctioning part by checking DTCs or performing a CAN bus check, or by checking waveform changes when ECUs or sensors are disconnected. The waveform will change to one for an open in both sides of a CAN branch when the ECU or sensor with an open CAN branch line is disconnected.

      2. B005MW9N05
        *a 1 V/DIV.
        *b 50 μs/DIV.

        Open in a CAN branch line (CANL)

        Tech Tips


        • An abnormal waveform is output from an ECU with an open in one of its CAN branch lines. Because this abnormal output interferes with the signals from other ECUs, the output of other ECUs will also appear abnormal.

        • Narrow down the malfunctioning part by checking DTCs or performing a CAN bus check, or by checking waveform changes when ECUs or sensors are disconnected. The waveform will change to one for an open in both sides of a CAN branch when the ECU or sensor with an open CAN branch line is disconnected.

      3. B005LERN05
        *a 1 V/DIV.
        *b 50 μs/DIV.

        Open in a CAN main bus line (CANH)

        Tech Tips


        • Waveforms of ECUs or sensors that are closer to the DLC3 than the open part are almost normal.

        • Waveforms of ECUs or sensors that are on the opposite side of the DLC3 from the open part are abnormal.

        • An open in a CAN main bus line can be confirmed by measuring the resistance between the CANH and CANL terminals of any CAN branch.

      4. B005LF9N05
        *a 1 V/DIV.
        *b 50 μs/DIV.

        Short between a CAN bus line (CANH) and ground

        Tech Tips


        • Narrow down the shorted part by checking for waveform changes when disconnecting connectors from the CAN junction connectors or when disconnecting ECUs or sensors.

        • A short to ground in the CANH line can be confirmed by measuring the resistance between CANH and ground using an ohmmeter.

      5. B005PJ2N05
        *a 1 V/DIV.
        *b 50 μs/DIV.

        Short between a CAN bus line (CANL) and ground

        Tech Tips


        • Narrow down the shorted part by checking for waveform changes when disconnecting connectors from the CAN junction connectors or when disconnecting ECUs or sensors.

        • A short to ground in the CANL line can be confirmed by measuring the resistance between CANL and ground using an ohmmeter.

  6. DATA SENDING/RECEIVING TABLE


    1. Data sending/receiving table

      Tech Tips

      If Data List items related to sent/received data are not displayed properly, the part for which communication is interrupted can be determined using the table below.

      Data Content Data Detected and Sent by

      Data Received by

      (Can be Checked in the Data List)

      Data Received by

      (Cannot be Checked in the Data List)

      		 Selected System Relevant Data List Item Link
      Accelerator position ECM

      • Skid control ECU (brake actuator assembly)

      • Engine stop and start ECU

      • Radio receiver assembly

      • Forward recognition camera

      • Driving support ECU assembly

      • Clearance warning ECU assembly

      • 4WD ECU assembly

      		 Engine Accelerator Position (for 2GR-FKS w/ Canister Pump Module)

      Click here

      Accelerator Position (for 2GR-FKS w/o Canister Pump Module)

      Click here

      Accelerator Position (for 8AR-FTS)

      Click here

      ABS/VSC/TRC/EPB Accelerator Opening Angle %

      Click here

      Stop and Start Accelerator Position

      Click here

      Engine speed ECM

      • Engine stop and start ECU

      • Skid control ECU (brake actuator assembly)

      • Absorber control ECU

      • Power steering ECU assembly

      • Option connector (bus buffer ECU)

      • Telematics transceiver

      • Radio receiver assembly

      • Clearance warning ECU assembly

      		 Engine Engine Speed (for 2GR-FKS w/ Canister Pump Module)

      Click here

      Engine Speed (for 2GR-FKS w/o Canister Pump Module)

      Click here

      Engine Speed (for 8AR-FTS)

      Click here

      Stop and Start Engine Spd (ECM)

      Click here

      ABS/VSC/TRC/EPB Engine Revolutions

      Click here

      Air suspension Engine Speed

      Click here

      EMPS Engine Revolution

      Click here

      Engine speed ECM

      • Combination meter assembly

      • Certification ECU (smart key ECU assembly)

      • Combination meter mirror ECU (headup display)

      • 4WD ECU assembly

      • Airbag sensor assembly

      • Main body ECU (multiplex network body ECU)

      • Air conditioning amplifier assembly

      		 Combination Meter Engine Rpm

      Click here

      Power Source Control Engine Condition

      Click here

      Head Up Display Engine Rpm

      Click here

      Engine coolant temperature ECM

      • Combination meter assembly

      • Air conditioning amplifier assembly

      • Engine stop and start ECU

      • 4WD ECU assembly

      • Radio receiver assembly

      • Power steering ECU assembly

      		 Engine Coolant Temperature (for 2GR-FKS w/ Canister Pump Module)

      Click here

      Coolant Temperature (for 2GR-FKS w/o Canister Pump Module)

      Click here

      Coolant Temperature (for 8AR-FTS)

      Click here

      Combination Meter Coolant Temperature

      Click here

      Air Conditioner Engine Coolant Temp

      Click here

      Stop and Start Coolant Temp

      Click here

      Four Wheel Drive Engine Coolant Temperature

      Click here

      Vehicle speed Skid control ECU (brake actuator assembly)

      • ECM

      • Radio receiver assembly

      • Telematics transceiver

      • Parking assist ECU

      • Forward recognition camera

      		 ABS/VSC/TRC/EPB Vehicle Speed

      Click here

      Engine Vehicle Speed (for 2GR-FKS w/ Canister Pump Module)

      Click here

      Vehicle Speed (for 2GR-FKS w/o Canister Pump Module)

      Click here

      Vehicle Speed (for 8AR-FTS)

      Click here

      Navigation System Vehicle Speed*11

      Click here

      Vehicle Speed*12

      Click here

      Vehicle Speed*13

      Click here

      Vehicle speed Skid control ECU (brake actuator assembly)

      • Driving support ECU assembly

      • Power steering ECU assembly

      • Combination meter assembly*3

      • Engine stop and start ECU

      • Combination meter mirror ECU (headup display)

      • Occupant detection ECU

      • Airbag sensor assembly

      • Main body ECU (multiplex network body ECU)

      		 Radar Cruise2 Vhcl Spd-Brake ECU

      Click here

      EMPS Meter Vehicle Velocity

      Click here

      Combination Meter Vehicle Speed Meter

      Click here

      Stop and Start Vehicle Spd1 (ABS/VSC)

      Click here

      Head Up Display Vehicle Speed Meter

      Click here

      Vehicle speed Combination meter assembly*3

      • Position Control ECU and Switch Assembly LH*5

      • Position Control ECU and Switch Assembly RH*6

      • Certification ECU (smart key ECU assembly)

      • Option connector (bus buffer ECU)

      • Telematics transceiver (for G-BOOK)

      • Multiplex network door ECU

      • Main body ECU (multiplex network body ECU)

      • Air conditioning amplifier assembly

      • Multiplex tilt and telescopic ECU

      • Position Control ECU and Switch Assembly RH*5

      • Position Control ECU and Switch Assembly LH*6

      		 Combination Meter Vehicle Speed Meter

      Click here

      Driver Seat Vehicle Speed

      Click here

      Power Source Control Vehicle Speed Signal

      Click here

      Wheel speed Skid control ECU (brake actuator assembly)

      • Absorber control ECU

      • Headlight ECU sub-assembly LH

      • 4WD ECU assembly

      • Power steering ECU assembly

      • Parking assist ECU

      • Clearance warning ECU assembly

      • Tire pressure warning ECU and receiver

      • ECM

      • Engine stop and start ECU

      • Radio receiver assembly

      • Forward recognition camera

      • Clearance warning ECU assembly

      • Blind spot monitor sensor LH

      • Airbag sensor assembly

      • Driving support ECU assembly

      • Headlight ECU sub-assembly LH*10

      		 ABS/VSC/TRC/EPB FR Wheel Speed

      Click here

      Air suspension FL Wheel Speed

      Click here

      AFS*9 FR Wheel Speed

      Click here

      HL AutoLeveling*10 Front Right Wheel Speed Value

      Click here

      Four Wheel Drive FR Wheel Speed

      Click here

      EMPS Wheel Speed Right

      Click here

      Shift position ECM

      • Radio receiver assembly

      • Clearance warning ECU assembly

      • Option connector (bus buffer ECU)

      • Telematics transceiver (for G-BOOK)

      • Parking assist ECU

      • Forward recognition camera

      • Driving support ECU assembly

      • Skid control ECU (brake actuator assembly)

      • Tire pressure warning ECU and receiver

      • Airbag sensor assembly

      		 Engine Neutral Position SW (for 2GR-FKS w/ Canister Pump Module)

      Click here

      Neutral Position SW (for 2GR-FKS w/o Canister Pump Module)

      Click here

      Neutral Position SW (for 8AR-FTS)

      Click here

      Navigation System Reverse Signal*11

      Click here

      Reverse Signal*12

      Click here

      Reverse Signal*13

      Click here

      IPA/ICS/Clearance Sonar Parking Signal*14

      Click here

      Parking Signal*15

      Click here

      Shift position ECM

      • Blind spot monitor sensor LH

      • Position control ECU and switch assembly LH*5

      • Position control ECU and switch assembly RH*6

      • Certification ECU (smart key ECU assembly)

      • Engine stop and start ECU

      • Position control ECU and switch assembly RH*5

      • Position control ECU and switch assembly LH*6

      • Headlight ECU sub-assembly LH

      • Combination meter assembly*2

      • Combination meter mirror ECU (headup display)

      • Main body ECU (multiplex network body ECU)

      		 Blind Spot Monitor Master Reverse (Only for AT/CVT)

      Click here

      Driver Seat P Switch

      Click here

      Power Source Control Shift P Signal

      Click here

      Stop and Start Shift Position

      Click here

      Ambient temperature Air conditioning amplifier assembly

      • Combination meter assembly

      • Engine stop and start ECU

      • 4WD ECU assembly

      • ECM

      • Option connector (bus buffer ECU)

      • Telematics transceiver (for G-BOOK)

      • Radio receiver assembly

      • Forward recognition camera

      • Driving support ECU assembly

      • Clearance warning ECU assembly

      • Skid control ECU (brake actuator assembly)

      • Main body ECU (multiplex network body ECU)

      • Combination meter mirror ECU (headup display)

      		 Air Conditioner Ambient Temp Sensor

      Click here

      Combination Meter Ambient Temperature

      Click here

      Stop and Start Ambient Temp Sensor

      Click here

      Four Wheel Drive Ambient Temperature

      Click here

      Driver door courtesy switch Main body ECU (multiplex network body ECU) Engine stop and start ECU

      • Option connector (bus buffer ECU)

      • Telematics transceiver (for G-BOOK)

      • Radio receiver assembly

      • Parking assist ECU

      • Forward recognition camera

      • Skid control ECU (brake actuator assembly)

      • Multiplex network door ECU

      • Combination meter assembly*2

      • Certification ECU (smart key ECU assembly)

      		 Main Body

      • FL Door Courtesy SW*5

      • FR Door Courtesy SW*6

      Click here

      Stop and Start D Courtesy Switch Signal

      Click here

      Steering angle Steering sensor

      • Blind spot monitor sensor LH

      • Skid control ECU (brake actuator assembly)

      • Absorber control ECU

      • Power steering ECU assembly

      • Engine stop and start ECU

      • 4WD ECU assembly

      • ECM

      • Radio receiver assembly

      • Parking assist ECU

      • Side camera LH (outer rear view mirror assembly LH)

      • Forward recognition camera

      • Clearance warning ECU assembly

      • Rear television camera assembly

      • Airbag sensor assembly

      • Combination meter assembly

      • Driving support ECU assembly

      • Headlight ECU sub-assembly LH

      		 Blind Spot Monitor Master Steering Angle

      Click here

      ABS/VSC/TRC/EPB Steering Angle Sensor

      Click here

      Air suspension Steering Angle

      Click here

      EMPS Steering Angle Velocity

      Click here

      Stop and Start Steering Angle

      Click here

      Four Wheel Drive Steering Angle Value

      Click here

      Yaw rate

      • Yaw rate sensor assembly*7

      • Airbag sensor assembly*8

      • Driving support ECU assembly

      • Blind spot monitor sensor LH

      • Skid control ECU (brake actuator assembly)

      • 4WD ECU assembly

      • Radio receiver assembly

      • Forward recognition camera

      • Power steering ECU assembly

      • Airbag sensor assembly*7

      		 Radar Cruise2 Yaw Rate Sensor

      Click here

      Blind Spot Monitor Master Yaw Rate Sensor

      Click here

      ABS/VSC/TRC/EPB Yaw Rate Sensor

      Click here

      Four Wheel Drive Yaw Rate Value

      Click here

      Acceleration

      • Yaw rate sensor assembly*7

      • Airbag sensor assembly*8

      • Driving support ECU assembly

      • Skid control ECU (brake actuator assembly)

      • 4WD ECU assembly

      • ECM

      • Engine stop and start ECU

      • Radio receiver assembly

      • Forward recognition camera

      • Clearance warning ECU assembly

      • Occupant detection ECU

      • Power steering ECU assembly*8

      • Airbag sensor assembly*7

      • Combination meter assembly

      • Absorber control ECU

      		 Radar Cruise2 Vehicle Acceleration

      Click here

      ABS/VSC/TRC/EPB Deceleration Sensor

      Click here

      Four Wheel Drive Forward and Rearward G

      Click here

      Ignition switch condition Main body ECU (multiplex network body ECU) Multiplex tilt and telescopic ECU

      • Option connector (bus buffer ECU)

      • Side camera RH (outer rear view mirror assembly RH)

      • Side camera LH (outer rear view mirror assembly LH)

      • Front television camera assembly

      • Rear television camera assembly

      • Skid control ECU (brake actuator assembly)

      • Position Control ECU and Switch Assembly RH

      • Position Control ECU and Switch Assembly LH

      		 Main Body IG SW

      Click here

      Tilt&Telescopic IG Switch

      Click here

      Ignition switch condition Main body ECU (multiplex network body ECU)

      • Position control ECU and switch assembly LH

      • Position control ECU and switch assembly RH

      • Outer mirror control ECU assembly (for driver side)

      • Outer mirror control ECU assembly (for front passenger side)

      • Multiplex network door ECU

      • Combination meter assembly*2

      • Certification ECU (smart key ECU assembly)

      • Combination meter mirror ECU (headup display)

      • Headlight ECU sub-assembly LH

      • Radio receiver assembly

      		 Driver Seat Ignition Switch

      Click here

      Passenger Seat Ignition Switch

      Click here

      Stop light switch signal Skid control ECU (brake actuator assembly)

      • Absorber control ECU

      • Engine stop and start ECU

      • 4WD ECU assembly

      • Option connector (bus buffer ECU)

      • Telematics transceiver (for G-BOOK)

      • Radio receiver assembly

      • Driving support ECU assembly

      • Power steering ECU assembly

      • Clearance warning ECU assembly

      • Airbag sensor assembly

      • Multiplex network door ECU

      • Certification ECU (smart key ECU assembly)

      		 ABS/VSC/TRC/EPB Stop Light SW

      Click here

      Air suspension Stop Light Switch

      Click here

      Stop and Start Stop Light SW (ABS/VSC)

      Click here

      Four Wheel Drive Stop Light SW

      Click here

      Driver side buckle switch signal Airbag sensor assembly -

      • Engine stop and start ECU

      • Telematics transceiver (for G-BOOK)

      • Combination meter assembly

      • Main body ECU (multiplex network body ECU)*4

      		 SRS Airbag Left side Buckle SW*5

      Click here

      Right side Buckle SW*6

      Click here

      Main body ECU (multiplex network body ECU)*4 -

      • Telematics transceiver (for G-BOOK)

      • Forward recognition camera

      • Clearance warning ECU assembly

      • Skid control ECU (brake actuator assembly)

      • Combination meter assembly*2

      		 - - -
      Headlight switch Main body ECU (multiplex network body ECU) Headlight ECU sub-assembly LH

      • ECM

      • Radio receiver assembly

      • Driving support ECU assembly

      • Combination meter assembly*2

      • Air conditioning amplifier assembly

      • Forward recognition camera

      		 Main Body Dimmer SW

      Click here

      AFS*9 Headlight High Beam State

      Click here

      HL AutoLeveling*10 Headlight High Beam State

      Click here

      Side turn signal Combination meter assembly*2

      • Forward recognition camera

      • Blind spot monitor sensor LH

      • Driving support ECU assembly

      • Clearance warning ECU assembly

      • Headlight ECU sub-assembly LH

      		 LKA/LDA Turn Signal Switch (Right)

      Click here

      Blind spot monitor Master Turn Switch State

      Click here

      Pre-Crash 2 Turn Light RH

      Click here

      ECM power source voltage*1 ECM - - Engine Battery Voltage (for 2GR-FKS w/ Canister Pump Module)

      Click here

      Battery Voltage (for 2GR-FKS w/o Canister Pump Module)

      Click here

      Battery Voltage (for 8AR-FTS)

      Click here

      Combination meter assembly power source voltage*1 Combination meter assembly - - Combination Meter +B Voltage Value

      Click here

      Skid control ECU (brake actuator assembly) power source voltage*1 Skid control ECU (brake actuator assembly) - - ABS/VSC/TRC/EPB BS1 Voltage Value

      Click here

      Power steering ECU assembly power source voltage*1 Power steering ECU assembly - - EMPS IG Power Supply

      Click here

      Radio receiver assembly power source voltage*1 Radio receiver assembly - - Navigation System Battery Voltage*11

      Click here

      Battery Voltage*12

      Click here

      Battery Voltage*13

      Click here

      Absorber control ECU power source voltage*1 Absorber control ECU - - Air suspension IG Power Source Voltage

      Click here

      Solar sensor*1 Air conditioning amplifier assembly - - Air Conditioner Solar Sensor (D side)

      Click here

      Driver door touch sensor*1 Certification ECU (smart key ECU assembly) - - Entry&Start D-Door Touch Sensor

      Click here

      Clearance sonar main switch condition*1 Clearance warning ECU assembly - - IPA/ICS/Clearance Sonar Main Switch*14

      Click here

      Main Switch*15

      Click here

      Blind spot monitor sensor LH power source voltage*1 Blind spot monitor sensor LH - - Blind Spot Monitor Master Power Supply Voltage

      Click here

      Outer mirror control ECU assembly (for driver side) power source voltage*1 Outer mirror control ECU assembly (for driver side) - -

      • Mirror L*5

      • Mirror R*6

      		 +B Voltage Input Value

      Click here

      Outer mirror control ECU assembly (for front passenger side) power source voltage*1 Outer mirror control ECU assembly (for front passenger side) - -

      • Mirror R*5

      • Mirror L*6

      		 +B Voltage Input Value

      Click here

      Position control ECU and switch assembly LH power source voltage*1 Position control ECU and switch assembly LH - -

      • Driver Seat*5

      • Passenger Seat*6

      		 Power Voltage

      Click here

      Position control ECU and switch assembly RH power source voltage*1 Position control ECU and switch assembly RH - -

      • Driver Seat*6

      • Passenger Seat*5

      		 Power Voltage

      Click here

      Multiplex tilt and telescopic ECU power source voltage*1 Multiplex tilt and telescopic ECU - - Tilt&Telescopic Power Source Voltage

      Click here

      Headlight ECU sub-assembly LH power source voltage*1 Headlight ECU sub-assembly LH - - HL Auto Leveling +B Voltage Value

      Click here

      Panoramic view monitor main switch condition*1 Parking assist ECU - - Panoramic View Monitor Camera Changing SW Signal Status

      Click here

      *1: Whether the ECU that sends data is functioning or not can be judged by using the GTS to check items such as switches or sensors that send signals to the ECU via direct lines.

      *2: Although the received contents cannot be checked in the Data List, whether or not the data is received normally can be checked by observing the combination meter assembly.

      *3: The combination meter assembly receives a vehicle speed signal from the skid control ECU (brake actuator assembly) and sends the signal to other ECUs.

      *4: The main body ECU (multiplex network body ECU) receives a driver seat buckle switch signal from the airbag sensor assembly and sends the signal to other ECUs.

      *5: for LHD

      *6: for RHD

      *7: w/ TFT Meter Type Combination Meter Assembly

      *8: w/ Optitron Meter Type Combination Meter Assembly

      *9: for Triple Beam Headlight

      *10: for Single Beam Headlight

      *11: w/ Navigation System

      *12: w/ 12.3 Inch Display Type Audio and Visual System

      *13: w/ 8 Inch Display Type Audio and Visual System

      *14: w/o Intelligent Clearance Sonar System

      *15: w/ Intelligent Clearance Sonar System