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.


      1. GTS display and installed systems

        Tech Tips

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

        Connected to Code ECU/Sensor Name GTS Display Applicability
        V bus CGW Central gateway ECU (network gateway ECU)

        • CAN Gateway1

        • CAN Gateway2

        		 Installed on all vehicles
        DLC3 DLC3 - Installed on all vehicles
        Bus 2 ENG ECM ECM (Engine) Installed on all vehicles
        MET Combination meter assembly Combination Meter Installed on all vehicles
        EPS Power steering ECU assembly Power Steering (EPS) Installed on all vehicles
        A/C Air conditioning amplifier assembly Air Conditioning Amplifier Installed on all vehicles
        SMT Certification ECU (smart key ECU assembly) Certification (Smart) Installed on all vehicles
        MB Main body ECU (multiplex network body ECU) Main Body Installed on all vehicles
        ASC Stereo component equalizer assembly ASC Installed on all vehicles
        BRK Skid control ECU (brake actuator assembly) Skid Control (ABS/VSC/TRAC) Installed on all vehicles
        YGS Yaw rate sensor Yaw Rate Sensor Installed on all vehicles
        SRS Airbag ECU assembly Airbag Installed on all vehicles
        STR Steering sensor Spiral cable (Steering Angle Sensor) Installed on all vehicles
        TVD Torque vectoring differential ECU assembly TVD Vehicles with torque vectoring differential system
        RSC Spoiler control ECU assembly Active Rear Wing Installed on all vehicles
        Bus 3 AV Radio receiver assembly Display and Navigation (AVN) Installed on all vehicles
        DCM Telematics transceiver DCM Vehicles with telematics transceiver
        YGW Option connector (bus buffer ECU) Accessory Gateway Vehicles with CAN compatible optional devices
        Bus 5 CS Clearance warning ECU assembly Clearance Warning (Clearance Sonar) Installed on all vehicles
        SUS Absorber control ECU Suspension Control (Air Suspension) Installed on all vehicles
        DS Driving support ECU assembly Driving Support (Cruise Control-ACC) Vehicles with Lexus Safety System +
        F-CAM Forward recognition camera Front Camera Module Vehicles with Lexus Safety System +
        F-MR Millimeter wave radar sensor assembly Front Radar Vehicles with Lexus Safety System +
        BSM Blind spot monitor sensor LH Blind Spot Monitor Master Vehicles with blind spot monitor system
        R-CA Rear Television Camera Assembly Parking Assist Monitor System / Rear Camera Installed on all vehicles
        Sub bus 1 MB Main body ECU (multiplex network body ECU) - Installed on all vehicles
        MIR-L

        • 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) Installed on all vehicles
        MIR-R

        • 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) Installed on all vehicles
        T&T Multiplex tilt and telescopic ECU Multiplex Tilt and Telescopic Installed on all vehicles
        DST

        • Position control ECU and switch assembly LH (LHD)

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

        		 D-Seat Installed on all vehicles
        LITM Headlight Light Control ECU Sub-assembly LH Headlight swivel (AFS) Installed on all vehicles
        PST

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

        • Position control ECU and switch assembly LH (RHD)

        		 P-Seat Installed on all vehicles

  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 White Communication has been normal.
      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):


      • Not communicating since the start of the CAN bus check

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

      Either of the following:


      • The central gateway ECU (network gateway ECU) has an internal malfunction or cannot communicate with the GTS.*4

      • No ECUs or sensors are connected to the bus.*5
      Sub bus with a gateway function equipped ECU that does not memorize connected ECUs or sensors*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 occurred at least once since the start of the CAN bus check, but is currently not occurring.
      Not displayed Communication stop has continued since the start of the CAN bus check.*1
      Sub bus with a gateway function equipped ECU that memorizes connected ECUs and sensors*3 White Communication has been normal.
      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):


      • Not communicating since the start of the CAN bus check

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

      Either of the following:


      • The gateway function equipped ECU cannot communicate with the central gateway ECU (network gateway ECU).*6

      • No ECUs or sensors are connected to the sub bus.*7

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

      • *1: An ECU or sensor is installed to the vehicle but is not displayed on the "Communication Bus Check" screen.

      • *2: The gateway function equipped ECU does not memorize ECUs and sensors connected to its respective sub bus.

      • *3: The gateway function equipped ECU memorizes ECUs and sensors connected to its respective sub bus.

      • *4: When the central gateway ECU (network gateway ECU) has an internal malfunction or cannot communicate with the GTS, the name of buses, sub buses, ECUs and sensors will not be displayed.

      • *5: When no ECUs or sensors are connected to a bus, the message "There is no system found on the communication Bus." will be displayed.

      • *6: When a gateway function equipped ECU cannot communicate with the central gateway ECU (network gateway ECU), the name of sub buses and ECUs or sensors connected to the sub bus will not be displayed.

      • *7: When no ECUs or sensors are connected to the sub bus, the message "There is no system found on the communication Bus." will be displayed.

      • If there is no communication between the GTS and the vehicle, or no ECUs or sensors are displayed as connected, check the central gateway ECU (network gateway ECU) and V bus (the bus that connects the DLC3 to the central gateway ECU (network gateway ECU)) for malfunctions.

    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 simulate 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 HV on the bus 4

      B0065JVC01
      *a Bus 2 *b Bus 4
      *c Sub Bus *d V Bus
      *e Location of Malfunction *f Background color is red

      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. 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 whose background color is red) is suspected.

      Example: Open in a CAN branch line for HV on the bus 4

      B0066R3C01
      *a Background color is red *b Background color intermittently becomes yellow or red
      *c Not displayed or background color is yellow or red - -
      Explanation of CAN Bus Check Screen
      Bus Type Background Color Connection Status
      Bus White Communication has been normal.
      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):


      • Not communicating since the start of the CAN bus check

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

      Either of the following:


      • The central gateway ECU (network gateway ECU) has an internal malfunction or cannot communicate with the GTS.*4

      • No ECUs or sensors are connected to the bus.*5
      Sub bus with a gateway function equipped ECU that does not memorize connected ECUs or sensors*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 occurred at least once since the start of the CAN bus check, but is currently not occurring.
      Not displayed Communication stop has continued since the start of the CAN bus check.*1
      Sub bus with a gateway function equipped ECU that memorizes connected ECUs and sensors*3 White Communication has been normal.
      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):


      • Not communicating since the start of the CAN bus check

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

      Either of the following:


      • The gateway function equipped ECU cannot communicate with the central gateway ECU (network gateway ECU).*6

      • No ECUs or sensors are connected to the sub bus.*7

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

      • *1: An ECU or sensor is installed to the vehicle but is not displayed on the "Communication Bus Check" screen.

      • *2: The gateway function equipped ECU does not memorize ECUs and sensors connected to its respective sub bus.

      • *3: The gateway function equipped ECU memorizes ECUs and sensors connected to its respective sub bus.

      • *4: When the central gateway ECU (network gateway ECU) has an internal malfunction or cannot communicate with the GTS, the name of buses, sub buses, ECUs and sensors will not be displayed.

      • *5: When no ECUs or sensors are connected to a bus, the message "There is no system found on the communication Bus." will be displayed.

      • *6: When a gateway function equipped ECU cannot communicate with the central gateway ECU (network gateway ECU), the name of sub buses and ECUs or sensors connected to the sub bus will not be displayed.

      • *7: When no ECUs or sensors are connected to the sub bus, the message "There is no system found on the communication Bus." will be displayed.

      • 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 HV is also unstable. In addition, in this example, MB is equipped with a gateway function. Therefore, communication is also unstable between the Sub bus ECUs of MB and the bus 4.

      • The example in the illustration shows that HV has a red background color on the CAN Bus Check screen. This indicates a more significant communication stop. In this case, a communication stop of HV is suspected.

    4. If a communication error is indicated on both the bus 4 and Sub bus on the CAN Bus Check screen, suspect any communication stop displayed for the bus 4 first.

      Example: Open in both CAN branch lines of MB on the bus 4

      B006767C01
      *a Background color is red *b Not displayed

      Tech Tips


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

      • 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 MB has a gateway function and a communication stop in MB is suspected.

    5. If the CAN Bus Check screen indicates a communication stop only in the sub bus, a communication stop in the sub bus is suspected.

      Example: Open in both CAN branch lines of MIR-R on the sub bus

      B00656WC01
      *a Background color is red - -

      Tech Tips


      • A communication error in a sub bus does not affect the other buses.

      • When a gateway function equipped ECU has memorized the ECUs that are connected to the sub bus, 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 central gateway ECU (network gateway ECU) than the open part will be displayed as a communication stop on the CAN Bus Check screen.

      (In this case, HVB, R-MGC and ENG background color changes to red.)

      B0066QHC01
      *a Bus 2 *b Bus 4
      *c Sub Bus *d V Bus
      *e Location of Malfunction *f Background color is red

      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 sub bus main bus lines are open, ECUs that are located farther away from the gateway function equipped ECU than the open part will be displayed as a communication stop on the CAN Bus Check screen.

      (In this case, MIR-L background color changes to red.)

      B0066NJC01
      *a Bus 2 *b Bus 4
      *c Sub Bus *d V Bus
      *e Location of Malfunction *f Background color is red

    8. 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
      B006732C01
      *a When any of the following malfunctions occur on the bus 4 *b When any of the following malfunctions occur on a sub bus
      *c Background color is red *d Not displayed

      Tech Tips


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

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

      • A communication error in a sub bus does not affect the 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.

    9. If a communication error of all ECUs and sensors is indicated on the CAN Bus Check screen, a communication stop of the V bus (DLC3 - central gateway ECU (network gateway ECU)) is suspected.

      Open in both CAN branch lines in the V bus

      B006792C01
      *a Bus 2 *b Bus 4
      *c Sub Bus *d V Bus
      *e Location of Malfunction *f Not displayed

      Tech Tips

      When there is no communication between the GTS and the vehicle, no ECUs or sensors will be displayed.

  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 / GTS Display "Engine"


      Powertrain > Engine > Trouble Codes

      Tech Tips


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

      • *: Refer to SFI System.

        Click here (w/ Canister Pump Module)

        Click here (w/o Canister Pump Module)

      ECM / GTS Display "Engine"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter DTC Storage Method
      U0101* Lost Communication with TCM 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 at least 2.25 seconds. MIL illuminates. DTC is stored until it is cleared using the GTS.

    2. ECM (w/o Lexus Safety System +) / 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 DTC Storage Method
      U0122 Lost Communication with Vehicle Dynamics Control Module The ECM does not receive data from the skid control ECU (brake actuator assembly) for 2.5 seconds or more.

      All conditions are met:


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

      • Cruise control main switch is on.

      • Vehicle speed is 40 km/h (25 mph) or more.

      		 Drive the vehicle at a speed of 40 km/h (25 mph) or more with the cruise control main switch on for 3.5 seconds or more. Displays messages on the multi-information display. DTC is stored until it is cleared using the GTS.

    3. TCM / GTS Display "ECT"


      Powertrain > ECT > Trouble Codes

      Tech Tips


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

      • *: Refer to Automatic Transmission System.

        Click here

      TCM / GTS Display "ECT"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter DTC Storage Method
      U0100* Lost Communication with ECM/PCM "A" 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 at least 2.25 seconds. MIL illuminates. DTC is stored until it is cleared using the GTS.

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


      Chassis > ABS/VSC/TRC > Trouble Codes

      Tech Tips

      This ECU uses the CAN communication system for DTC communication.

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

      One of the following conditions is met:


      • Delayed reception of data from the steering sensor, yaw rate sensor and front steering control ECU continues for 1 second or more.

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


        • Delayed reception of data from the steering sensor, yaw rate sensor and front steering control ECU occurs once or more within 5 seconds.

      • The following condition occurs 10 times in succession:


        • The skid control ECU (brake actuator assembly) cannot send/receive data (bus off) once or more within 0.1 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.

      • Brake warning light illuminates.

      		 DTC is stored until it is cleared using the GTS.
      U0100 Lost Communication With ECM/PCM "A" 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.

      		 Turn the engine switch on (IG) and drive the vehicle at a speed of 15 km/h (9 mph) or more for 3 seconds or more. Check that the warning light remains off after the initial light check. 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 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 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.
      U110F Lost Communication With Roll Rate Sensor/Vertical Acceleration Sensor Module

      Either of the following conditions is met:


      • The skid control ECU (brake actuator assembly) does not receive data from the roll rate and vertical acceleration 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 roll rate and vertical acceleration 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 60 seconds.

      • ABS warning light illuminates.

      • Slip indicator light illuminates.

      		 DTC is stored until it is cleared using the GTS.

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


      Chassis > EMPS > Trouble Codes

      Tech Tips

      This ECU uses the CAN communication system for DTC communication.

      Power Steering ECU Assembly / GTS Display "EMPS"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter DTC Storage Method
      U0100 Lost Communication with ECM/PCM "A" 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.
      U0132 Lost Communication with Ride Level Control Module The power steering ECU assembly does not receive data from the absorber control ECU for 6.1 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 9.1 seconds. - DTC remains stored only while malfunction is occurring.
      U1104 Lost Communication with Driving Support ECU The power steering ECU assembly does not receive data from the forward recognition camera 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 power steering ECU assembly is 9 V or more.

      		 Turn the engine switch on (IG) and wait at least 8 seconds. - DTC remains stored only while malfunction is occurring.

    6. 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: for LHD

      • *2: for RHD

      This ECU uses the CAN communication system for DTC communication.

      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 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:


      • 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 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 TCM 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 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 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 (brake actuator 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 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 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 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 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 light control ECU sub-assembly LH 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 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 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.*1

      • 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.*2

      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 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.
      U0200 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.*1

      • 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.*2

      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 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.
      U0208 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.*1

      • 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.*2

      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 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.
      U0209 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.*1

      • 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.*2

      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 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 Lost Communication With Image Processing Module "A" The main body ECU (multiplex network body ECU) does not receive data from the lane departure warning 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 V or more.

      		 Turn the engine switch on (IG) and wait at least 20 seconds. Displays messages on the multi-information display. 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 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 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), headlight light control ECU sub-assembly LH 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 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.

      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 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 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 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.

    7. 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.

      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 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.
      U1117 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.

    8. 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.

      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 DTC Storage Method
      U0100 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.
      U1117 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.

    9. 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 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.

    10. Telematics Transceiver (w/ Telematics Transceiver) / 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 DTC Storage Method
      U0100 Lost Communication with ECM/PCM "A" 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.

    11. 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 DTC Storage Method
      U0100 Lost Communication With ECM/PCM "A" The air conditioning amplifier assembly does not receive data from the ECM 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.
      U0131 Lost Communication With Power Steering Control Module 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 Body Control Module "B" 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 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.
      U0155 Lost Communication With Instrument Panel Cluster (IPC) Control Module 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.

    12. Radio Receiver Assembly / GTS Display "Navigation System"


      Body Electrical > Navigation System > Trouble Codes

      Tech Tips

      This ECU uses the CAN communication system for DTC communication.

      Radio Receiver Assembly / GTS Display "Navigation System"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter DTC Storage Method
      U0073 Sending Malfunction (Navigation to APGS) The radio receiver assembly 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 radio receiver assembly is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 3 seconds. Displays messages on the multi-information display. 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 3 seconds 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 13 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 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 radio receiver assembly is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 13 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 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 radio receiver assembly is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 13 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 3 seconds 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 33 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 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 radio receiver assembly is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 13 seconds. Displays messages on the multi-information display. DTC is stored until it is cleared using the GTS.
      U0198 Lost Communication with Telematic 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) for 3 seconds 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 6 seconds. - DTC is stored until it is cleared using the GTS.
      U0265 Lost Communication with Image Processing Sensor A The radio receiver assembly does not receive data from the rear television camera assembly for 11.08 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 3 seconds 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 14.08 seconds. - DTC is stored until it is cleared using the GTS.
      U1110 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 3 seconds 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 13 seconds. - DTC is stored until it is cleared using the GTS.

    13. 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.

      Combination Meter Assembly / GTS Display "Combination Meter"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter 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 9.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 2 seconds. - 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 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.
      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 9.5 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 3 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG).

      • The power source voltage of the combination meter 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.
      U0151 Lost Communication with Restraints Control Module The combination meter assembly does not receive data from the airbag 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 9.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 10 seconds.

      • SRS warning light illuminates.

      • Displays messages on the multi-information display.

      		 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 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.
      U0182 Lost Communication with Lighting Control Module Front The combination meter assembly does not receive data from the headlight leveling 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 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.
      U023A Lost Communication with Front Camera Module The combination meter assembly does not receive data from the lane departure warning 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 9.5 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.
      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 9.5 V or more.

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

    14. Outer Mirror Control ECU Assembly (for Front Passenger Side) / 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 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.

    15. Outer Mirror Control ECU Assembly (for Driver Side) / 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 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.

    16. 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: for LHD

      • *2: 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 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 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.*1

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

      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.

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


      Powertrain > Radar Cruise > Trouble Codes

      Tech Tips


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

      • *: Refer to Dynamic Radar Cruise Control System.

        Click here

      Driving Support ECU Assembly / GTS Display "Radar Cruise"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter 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 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.
      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.

      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 6.04 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* 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* Lost Communication with Driving Support ECU The millimeter wave radar sensor assembly does not receive data from the driving support ECU assembly for 0.2 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 1.2 seconds or more. Displays messages on the multi-information display. DTC is stored until it is cleared using the GTS.

    18. Driving Support ECU Assembly (w/ Lexus Safety System +) / GTS Display "Pre-Collision 2"


      Body Electrical > Pre-Collision 2 > Trouble Codes

      Tech Tips


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

      • *: Refer to Pre-collision System.

        Click here

      Driving Support ECU Assembly / GTS Display "Pre-Collision 2"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter DTC Storage Method
      U0100 Lost Communication with ECM/PCM "A" The driving support ECU 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 3 seconds 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 8.12 seconds or more.

      • Displays messages on the multi-information display.

      • PCS warning light illuminates.

      		 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 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 driving support ECU assembly is 10 V or more.

      		 Turn the engine switch on (IG) and wait at least 3.72 seconds.

      • Displays messages on the multi-information display.

      • PCS warning light illuminates.

      		 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 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 driving support ECU assembly is 10 V or more.

      		 Turn the engine switch on (IG) and wait at least 8.04 seconds.

      • Displays messages on the multi-information display.

      • PCS warning light illuminates.

      		 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 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 driving support ECU assembly is 10 V or more.

      		 Turn the engine switch on (IG) and wait at least 7.92 seconds.

      • Displays messages on the multi-information display.

      • PCS warning light illuminates.

      		 DTC is stored until it is cleared using the GTS.
      U0235* 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 at least 3.3 seconds.

      • Displays messages on the multi-information display.

      • PCS warning light illuminates.

      		 DTC is stored until it is cleared using the GTS.
      U023A* 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 at least 6 seconds.

      • Displays messages on the multi-information display.

      • PCS warning light illuminates.

      		 DTC is stored until it is cleared using the GTS.
      U1002* 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 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 3.5 seconds.

      • Displays messages on the multi-information display.

      • PCS warning light illuminates.

      		 DTC is stored until it is cleared using the GTS.
      U1104* Lost Communication with Driving Support ECU

      One of the following conditions is met:


      • The millimeter wave radar sensor assembly does not receive data from the driving support ECU assembly for 0.144 seconds or more.

      • The 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.

      • Displays messages on the multi-information display.

      • PCS warning light illuminates.

      		 DTC is stored until it is cleared using the GTS.

    19. Clearance Warning ECU Assembly / GTS Display "Clearance Sonar"


      Body Electrical > Clearance Sonar > Trouble Codes

      Tech Tips

      This ECU uses the CAN communication system for DTC communication.

      Clearance Warning ECU Assembly / GTS Display "Clearance Sonar"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter DTC Storage Method
      U0101 Lost Communication with TCM The clearance warning ECU assembly does not receive data from the ECM for 5 seconds or more.

      Both conditions are met:


      • The engine switch is on (IG) for 5 seconds or more.

      • The power source voltage of the clearance warning ECU assembly is 10.2 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 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 5 seconds or more.

      • The power source voltage of the clearance warning ECU assembly is 10.2 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.

    20. 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.

      • *: 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 DTC Storage Method
      U0100 Lost Communication with ECM/PCM "A" The blind spot monitor sensor LH does not receive data from the ECM for 10.85 seconds or more.

      All conditions are met:


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

      • Blind spot monitor main switch is on.

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

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

      		 Turn the engine switch on (IG), turn the blind spot monitor system on using the blind spot monitor main switch (ON/OFF switch) and drive the vehicle at a speed of 5 km/h (3 mph) or more for 11.85 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 blind spot monitor sensor LH does not receive data from the yaw rate sensor for 0.86 seconds or more.

      All conditions are met:


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

      • Blind spot monitor main switch is on.

      • Vehicle speed is 7 km/h (4 mph) or more.

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

      		 Turn the engine switch on (IG), turn the blind spot monitor system on using the blind spot monitor main switch (ON/OFF switch) and drive the vehicle at a speed of 7 km/h (4 mph) or more for 1.86 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 blind spot monitor sensor LH does not receive data from the steering sensor for 10.68 seconds or more.

      All conditions are met:


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

      • Blind spot monitor main switch is on.

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

      		 Turn the engine switch on (IG), turn the blind spot monitor system on using the blind spot monitor main switch (ON/OFF switch) and wait at least 11.68 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 2.33 seconds or more.

      All conditions are met:


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

      • Blind spot monitor main switch is on.

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

      		 Turn the engine switch on (IG), turn the blind spot monitor system on using the blind spot monitor main switch (ON/OFF switch) and wait at least 3.33 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.

      All conditions are met:


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

      • Blind spot monitor main switch is on.

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

      		 Turn the engine switch on (IG), turn the blind spot monitor system on using the blind spot monitor main switch (ON/OFF switch) and wait at least 11.6 seconds. Displays messages on the multi-information display. DTC is stored until it is cleared using the GTS.
      U0232* 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.

      All conditions are met:


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

      • Blind spot monitor main switch is on.

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

      		 Turn the engine switch on (IG), turn the blind spot monitor system on using the blind spot monitor main switch (ON/OFF switch) and wait at least 11.6 seconds. Displays messages on the multi-information display. DTC is stored until it is cleared using the GTS.
      U1331* 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.

      All conditions are met:


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

      • Blind spot monitor main switch is on.

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

      		 Turn the engine switch on (IG), turn the blind spot monitor system on using the blind spot monitor main switch (ON/OFF switch) and wait at least 1 second. Displays messages on the multi-information display. DTC is stored until it is cleared using the GTS.

    21. 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.

      • *: Refer to Lane Departure Alert System (w/ Steering Control).

        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 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 power source voltage (IGB terminal voltage) of the forward recognition camera is 10 V or more for 2 seconds or more.

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

      • LDA main switch is on.

      		 Turn the engine switch on (IG), turn the lane departure alert system on using the LDA main switch and 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.

      • Lane departure alert indicator (yellow) illuminates.

      		 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 power source voltage (IGB terminal voltage) of the forward recognition camera is 10 V or more for 2 seconds or more.

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

      • LDA main switch is on.

      		 Turn the engine switch on (IG), turn the lane departure alert system on using the LDA main switch and 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.

      • Lane departure alert indicator (yellow) illuminates.

      		 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 for 5 seconds or more.

      All conditions are met:


      • The power source voltage (IGB terminal voltage) of the forward recognition camera is 10 V or more for 2 seconds or more.

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

      • LDA main switch is on.

      		 Turn the engine switch on (IG), turn the lane departure alert system on using the LDA main switch and 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.

      • Lane departure alert indicator (yellow) illuminates.

      		 DTC is stored until it is cleared using the GTS.
      U0126 Lost Communication with Steering Angle Sensor Module The forward recognition camera does not receive data from the steering sensor for 5 seconds or more.

      Both conditions are met:


      • The power source voltage (IGB terminal voltage) of the forward recognition camera is 10 V or more for 2 seconds or more.

      • LDA main switch is on.

      		 Turn the engine switch on (IG), turn the lane departure alert system on using the LDA main switch and wait at least 7 seconds.

      • Displays messages on the multi-information display.

      • Lane departure alert indicator (yellow) illuminates.

      		 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 power source voltage (IGB terminal voltage) of the forward recognition camera is 10 V or more for 2 seconds or more.

      • LDA main switch is on.

      		 Turn the engine switch on (IG), turn the lane departure alert system on using the LDA main switch and wait at least 7 seconds.

      • Displays messages on the multi-information display.

      • Lane departure alert indicator (yellow) illuminates.

      		 DTC is stored until it is cleared using the GTS.
      U0131 Lost Communication with Power Steering Control Module The forward recognition camera does not receive data from the power steering ECU assembly for 5 seconds or more.

      Both conditions are met:


      • The power source voltage (IGB terminal voltage) of the forward recognition camera is 10 V or more for 2 seconds or more.

      • LDA main switch is on.

      		 Turn the engine switch on (IG), turn the lane departure alert system on using the LDA main switch and wait at least 7 seconds.

      • Displays messages on the multi-information display.

      • Lane departure alert indicator (yellow) illuminates.

      		 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 power source voltage (IGB terminal voltage) of the forward recognition camera is 10 V or more for 2 seconds or more.

      • LDA main switch is on.

      		 Turn the engine switch on (IG), turn the lane departure alert system on using the LDA main switch and wait at least 7 seconds.

      • Displays messages on the multi-information display.

      • Lane departure alert indicator (yellow) illuminates.

      		 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 power source voltage (IGB terminal voltage) of the forward recognition camera is 10 V or more for 2 seconds or more.

      • LDA main switch is on.

      		 Turn the engine switch on (IG), turn the lane departure alert system on using the LDA main switch and wait at least 52 seconds.

      • Displays messages on the multi-information display.

      • Lane departure alert indicator (yellow) illuminates.

      		 DTC is stored until it is cleared using the GTS.
      U0235* 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.

      Both conditions are met:


      • The power source voltage (IGB terminal voltage) of the forward recognition camera is 10 V or more for 2 seconds or more.

      • LDA main switch is on.

      		 Turn the engine switch on (IG), turn the lane departure alert system on using the LDA main switch and wait at least 7 seconds.

      • Displays messages on the multi-information display.

      • Lane departure alert indicator (yellow) illuminates.

      		 DTC is stored until it is cleared using the GTS.
      U023A* 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.

      Both conditions are met:


      • The power source voltage (IGB terminal voltage) of the forward recognition camera is 10 V or more for 2 seconds or more.

      • LDA main switch is on.

      		 Turn the engine switch on (IG), turn the lane departure alert system on using the LDA main switch and wait at least 7 seconds.

      • Displays messages on the multi-information display.

      • Lane departure alert indicator (yellow) illuminates.

      		 DTC is stored until it is cleared using the GTS.
      U1104* 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.

      Both conditions are met:


      • The power source voltage (IGB terminal voltage) of the forward recognition camera is 10 V or more for 2 seconds or more.

      • LDA main switch is on.

      		 Turn the engine switch on (IG), turn the lane departure alert system on using the LDA main switch and wait at least 7 seconds.

      • Displays messages on the multi-information display.

      • Lane departure alert indicator (yellow) illuminates.

      		 DTC is stored until it is cleared using the GTS.

    22. 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.

      • *: Refer to Forward 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 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:


      • The power source voltage (IGB terminal voltage) of the forward recognition camera is 10 V or more for 2 seconds or more.

      • Vehicle speed is 1 km/h or 1 mph 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.

      • PCS warning light illuminates.

      		 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:


      • The power source voltage (IGB terminal voltage) of the forward recognition camera is 10 V or more for 2 seconds or more.

      • Vehicle speed is 1 km/h or 1 mph 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 for 5 seconds or more.

      Both conditions are met:


      • The power source voltage (IGB terminal voltage) of the forward recognition camera is 10 V or more for 2 seconds or more.

      • Vehicle speed is 1 km/h or 1 mph 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.

      • PCS warning light illuminates.

      		 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. The power source voltage (IGB terminal voltage) of the forward recognition camera is 10 V or more for 2 seconds or more. Turn the engine switch on (IG) and wait at least 7 seconds.

      • Displays messages on the multi-information display.

      • PCS warning light illuminates.

      		 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. The power source voltage (IGB terminal voltage) of the forward recognition camera is 10 V or more for 2 seconds or more. Turn the engine switch on (IG) and wait at least 7 seconds.

      • Displays messages on the multi-information display.

      • PCS warning light illuminates.

      		 DTC is stored until it is cleared using the GTS.
      U0235* 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. The power source voltage (IGB terminal voltage) of the forward recognition camera is 10 V or more for 2 seconds or more. Turn the engine switch on (IG) and wait at least 7 seconds.

      • Displays messages on the multi-information display.

      • PCS warning light illuminates.

      		 DTC is stored until it is cleared using the GTS.
      U1104* 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. The power source voltage (IGB terminal voltage) of the forward recognition camera is 10 V or more for 2 seconds or more. Turn the engine switch on (IG) and wait at least 7 seconds.

      • Displays messages on the multi-information display.

      • PCS warning light illuminates.

      		 DTC is stored until it is cleared using the GTS.

    23. Forward Recognition Camera (w/ Lexus Safety System + and 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.

      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 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:


      • The power source voltage (IGB terminal voltage) of the forward recognition camera is 10 V or more for 2 seconds or more.

      • Vehicle speed is 1 km/h or 1 mph 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.

      Both conditions are met:


      • The power source voltage (IGB terminal voltage) of the forward recognition camera is 10 V or more for 2 seconds or more.

      • Vehicle speed is 1 km/h or 1 mph 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 for 5 seconds or more.

      Both conditions are met:


      • The power source voltage (IGB terminal voltage) of the forward recognition camera is 10 V or more for 2 seconds or more.

      • Vehicle speed is 1 km/h or 1 mph 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. The power source voltage (IGB terminal voltage) of the forward recognition camera is 10 V or more for 2 seconds 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. The power source voltage (IGB terminal voltage) of the forward recognition camera is 10 V or more for 2 seconds 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. The power source voltage (IGB terminal voltage) of the forward recognition camera is 10 V or more for 2 seconds 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.

    24. Headlight Light Control ECU Sub-assembly LH / GTS Display "HL AutoLeveling"


      Body Electrical > HL AutoLeveling > Trouble Codes

      Tech Tips


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

      • *: The headlight light control ECU sub-assembly LH stores U1000 if an internal error related to the CAN communication system is detected.

        Click here

      Headlight Light Control 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 DTC Storage Method
      U0073 Control Module Communication Bus OFF The headlight light control ECU sub-assembly LH does not send/receive data for 1 second or more.

      Both conditions are met:


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

      • The power source voltage of the headlight light control ECU sub-assembly LH 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.
      U0100 Lost Communication with ECM/PCM "A" The headlight light control 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 light control ECU sub-assembly LH is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 13 seconds. - DTC is stored until it is cleared using the GTS.
      U0101 Lost Communication with TCM The headlight light control 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 light control ECU sub-assembly LH is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 13 seconds. - DTC is stored until it is cleared using the GTS.
      U0129 Lost Communication with Brake System Control Module The headlight light control 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 light control ECU sub-assembly LH is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 13 seconds. - DTC is stored until it is cleared using the GTS.
      U0142 Lost Communication with Body Control Module "B" The headlight light control 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 light control ECU sub-assembly LH is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait 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 light control 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 light control ECU sub-assembly LH is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 33 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.

    25. Stereo component equalizer assembly / GTS Display "ASC"


      Body Electrical > ASC > Trouble Codes

      Tech Tips

      This ECU uses the CAN communication system for DTC communication.

      Stereo Component Equalizer Assembly / GTS Display "ASC"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter DTC Storage Method
      U0100 Lost Communication With ECM/PCM "A" The stereo component equalizer assembly does not receive data from the ECM for 5.2 seconds or more.

      Both conditions are met:


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

      • The power source voltage of the stereo component equalizer assembly is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 8.2 seconds. - DTC is stored until it is cleared using the GTS.
      U0122 Lost Communication With Vehicle Dynamics Control Module The stereo component equalizer assembly does not receive data from the skid control ECU (brake actuator assembly) for 1.1 seconds or more.

      Both conditions are met:


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

      • The power source voltage of the stereo component equalizer assembly is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 4.1 seconds. - DTC is stored until it is cleared using the GTS.
      U0142 Lost Communication With Body Control Module "B" The stereo component equalizer assembly does not receive data from the main body ECU (multiplex network body ECU) for 3.1 seconds or more.

      Both conditions are met:


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

      • The power source voltage of the stereo component equalizer assembly is 9.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 6.1 seconds. - DTC is stored until it is cleared using the GTS.

    26. Spoiler control ECU assembly / GTS Display "Active Rear Wing"


      Body Electrical > Active Rear Wing > Trouble Codes

      Tech Tips

      This ECU uses the CAN communication system for DTC communication.

      Spoiler Control ECU Assembly / GTS Display "Active Rear Wing"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter DTC Storage Method
      U0101 Lost Communication with TCM The spoiler control ECU assembly 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 spoiler control ECU assembly is 10 V or more.

      		 Turn the engine switch on (IG) and wait at least 10 seconds. - DTC remains stored only while malfunction is occurring.
      U0129 Lost Communication with Brake System Control Module The spoiler control ECU assembly 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 spoiler control ECU assembly is 10 V or more.

      		 Turn the engine switch on (IG) and wait at least 10 seconds. - DTC remains stored only while malfunction is occurring.
      U0142 Lost Communication with Body Control Module "B" The spoiler control ECU 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 spoiler control ECU assembly is 10 V or more.

      		 Turn the engine switch on (IG) and wait at least 10 seconds. - DTC remains stored only while malfunction is occurring.
      U0155 Lost Communication with Instrument Panel Cluster (IPC) Control Module The spoiler control ECU assembly 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 spoiler control ECU assembly is 10 V or more.

      		 Turn the engine switch on (IG) and wait at least 10 seconds. - DTC remains stored only while malfunction is occurring.

    27. Torque vectoring differential ECU assembly (w/ Torque Vectoring Differential System) / GTS Display "TVD"


      Chassis > TVD > Trouble Codes

      Tech Tips

      This ECU uses the CAN communication system for DTC communication.

      Torque Vectoring Differential ECU Assembly / GTS Display "TVD"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter DTC Storage Method
      U0100 Lost Communication With ECM/PCM "A" The torque vectoring differential ECU assembly does not receive data from the ECM for 0.84 seconds or more.

      Both conditions are met:


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

      • The power source voltage of the torque vectoring differential ECU assembly is 10 V or more.

      		 Turn the engine switch on (IG) and wait at least 1.84 seconds. Displays messages on the multi-information display. DTC is stored until it is cleared using the GTS.
      U0122 Lost Communication With Vehicle Dynamics Control Module (ch1) The torque vectoring differential ECU assembly does not receive data from the skid control ECU (brake actuator assembly) for 0.72 seconds or more.

      Both conditions are met:


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

      • The power source voltage of the torque vectoring differential ECU assembly is 10 V or more.

      		 Turn the engine switch on (IG) and wait at least 1.72 seconds. 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 torque vectoring differential ECU assembly does not receive data from the yaw rate sensor for 0.72 seconds or more.

      Both conditions are met:


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

      • The power source voltage of the torque vectoring differential ECU assembly is 10 V or more.

      		 Turn the engine switch on (IG) and wait at least 1.72 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 torque vectoring differential ECU assembly does not receive data from the steering sensor for 0.72 seconds or more.

      Both conditions are met:


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

      • The power source voltage of the torque vectoring differential ECU assembly is 10 V or more.

      		 Turn the engine switch on (IG) and wait at least 1.72 seconds. Displays messages on the multi-information display. DTC is stored until it is cleared using the GTS.
      U0131 Lost Communication With Power Steering Control Module The torque vectoring differential ECU assembly does not receive data from the power steering ECU assembly for 0.8 seconds or more.

      Both conditions are met:


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

      • The power source voltage of the torque vectoring differential ECU assembly is 10 V or more.

      		 Turn the engine switch on (IG) and wait at least 1.8 seconds. Displays messages on the multi-information display. DTC is stored until it is cleared using the GTS.
      U1172 Lost Communication With Vehicle Dynamics Control Module (ch2) The torque vectoring differential ECU assembly does not receive data from the skid control ECU (brake actuator assembly) for 0.72 seconds or more.

      Both conditions are met:


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

      • The power source voltage of the torque vectoring differential ECU assembly is 10 V or more.

      		 Turn the engine switch on (IG) and wait at least 1.72 seconds. Displays messages on the multi-information display. DTC is stored until it is cleared using the GTS.

    28. Absorber Control ECU / GTS Display "Air suspension"


      Chassis > Air suspension > Trouble Codes

      Tech Tips

      This ECU uses the CAN communication system for DTC communication.

      Absorber Control ECU / GTS Display "Air suspension"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter 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 4 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 TCM 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 7 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 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.
      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.

    29. Rear Television Camera Assembly / GTS Display "IPA/Parking Assist Monitor"


      Chassis > IPA/Parking Assist Monitor > 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 "IPA/Parking Assist Monitor"
      DTC Detection Item DTC Detection Condition DTC Detection Pre-condition DTC Check Procedure Warning Indication in Meter DTC Storage Method
      U0100 Lost Communication with ECM/PCM "A" The rear television camera assembly does not receive data from the ECM for 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 rear television camera assembly is 5.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 15 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 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 rear television camera assembly is 5.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 15 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.

      Both conditions are met:


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

      • The power source voltage of the rear television camera assembly is 5.5 V or more.

      		 Turn the engine switch on (IG) and wait 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.

      Both conditions are met:


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

      • The power source voltage of the rear television camera assembly is 5.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 14 seconds. - DTC is stored until it is cleared using the GTS.
      U0233 Lost Communication with Blind Spot Monitor Master Module The rear television camera assembly 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 rear television camera assembly is 5.5 V or more.

      		 Turn the engine switch on (IG) and wait 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 is stored until it is cleared using the GTS.
      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.

      Both conditions are met:


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

      • The power source voltage of the rear television camera assembly is 5.5 V or more.

      		 Turn the engine switch on (IG) and wait at least 14 seconds. - DTC is stored until it is cleared using the GTS.

    30. Central Gateway ECU (Network Gateway ECU) / GTS Display "Central Gateway"

      Tech Tips

      The central gateway ECU (network gateway ECU) is connected to the CAN communication system, but the central gateway ECU (network gateway ECU) does not store or output CAN communication DTCs.

    31. Yaw Rate Sensor

      Tech Tips

      The yaw rate sensor is connected to the CAN communication system, but the yaw rate sensor does not store or output CAN communication DTCs.

    32. 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.

    33. Roll Rate and Vertical Acceleration Sensor

      Tech Tips

      The roll rate and vertical acceleration sensor is connected to the CAN communication system, but the roll rate and vertical acceleration sensor does not store or output CAN communication DTCs.

    34. Position Control ECU and Switch Assembly LH

      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.

    35. Position Control ECU and Switch Assembly RH

      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.

    36. 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.

    37. Airbag ECU Assembly

      Tech Tips

      The airbag ECU assembly is connected to the CAN communication system, but the airbag ECU assembly does not store or output CAN communication DTCs.

  5. CAN BUS WAVEFORMS

    B00672SE02

    Tech Tips


    • The following waveforms are measured between terminals CANH and GND, and terminals CANL and GND of the central gateway ECU (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. B0065BMN07
        *a 1 V/DIV.
        *b 50 μs/DIV.

        Normal waveform

      2. B0065ONN05
        *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. B0065JMN05
        *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. B0065EHN05
        *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. B0065YLN05
        *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. B0066XDN05
        *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 central gateway ECU (network gateway ECU) than the open part are almost normal.

        • Waveforms of ECUs or sensors that are on the opposite side of the central gateway ECU (network gateway ECU) 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. B0066ZYN05
        *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. B0066Q8N05
        *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 Relevant Data List Item
      Can be Checked in the Data List Cannot be Checked in the Data List Selected System*7 Data List Item
      Accelerator position ECM

      • Skid control ECU (brake actuator assembly)

      • Torque vectoring differential ECU assembly

      • Stereo component equalizer assembly

      • Radio receiver assembly

      • Driving support ECU assembly

      • Forward recognition camera

      		 Engine Accelerator Position
      ABS/VSC/TRC Accelerator Opening Angle %
      TVD Open Rate of Acceleleration
      ASC Accelerator Position
      Engine speed ECM

      • Skid control ECU (brake actuator assembly)

      • Power steering ECU assembly

      • Certification ECU (smart key ECU assembly)

      • Combination meter assembly

      • Absorber control ECU

      • Stereo component equalizer assembly

      • Torque vectoring differential ECU assembly

      • Air conditioning amplifier assembly

      • Airbag ECU assembly

      • Radio receiver assembly

      • Main body ECU (multiplex network body ECU)

      • Option connector (bus buffer ECU)

      		 Engine Engine Speed
      ABS/VSC/TRC Engine Revolutions
      EMPS Engine Revolution
      Starting Control Engine Speed
      Combination Meter Engine Rpm
      Air suspension Engine Speed
      ASC Engine Revolution
      TVD Engine Speed
      Engine coolant temperature ECM

      • Air conditioning amplifier assembly

      • Combination meter assembly

      • Torque vectoring differential ECU assembly

      • Skid control ECU (brake actuator assembly)

      • Power steering ECU assembly

      • Radio receiver assembly

      • Certification ECU (smart key ECU assembly)

      		 Engine Coolant Temp
      Air Conditioner Engine Coolant Temp
      Combination Meter Coolant Temperature
      TVD Coolant Temperature
      Vehicle speed Skid control ECU (brake actuator assembly)

      • Power steering ECU assembly

      • Combination meter assembly*3

      • Radio receiver assembly

      • Stereo component equalizer assembly

      • Airbag ECU assembly

      • Forward recognition camera

      • Main body ECU (multiplex network body ECU)

      • Telematics transceiver

      		 ABS/VSC/TRC Vehicle Speed
      EMPS Meter Vehicle Velocity
      Combination Meter Vehicle Speed Meter
      Navigation System Vehicle Speed
      ASC Vehicle Speed
      Combination meter assembly*3

      • Position control ECU and switch assembly LH

      • Position control ECU and switch assembly RH

      • Certification ECU (smart key ECU assembly)

      • Air conditioning amplifier assembly

      • Main body ECU (multiplex network body ECU)

      • Option connector (bus buffer ECU)

      • Multiplex tilt and telescopic ECU

      • Airbag ECU assembly

      • Clearance warning ECU assembly

      		 Combination Meter Vehicle Speed Meter
      Driver Seat Vehicle Speed
      Passenger Seat Vehicle Speed
      Power Source Control Vehicle Speed Signal
      Wheel speed Skid control ECU (brake actuator assembly)

      • Headlight light control ECU sub-assembly LH

      • Torque vectoring differential ECU assembly

      • Absorber control ECU

      • ECM

      • Power steering ECU assembly

      • Blind spot monitor sensor LH

      • Forward recognition camera

      • Airbag ECU assembly

      • Radio receiver assembly

      • Driving support ECU assembly

      		 ABS/VSC/TRC FR Wheel Speed
      HL AutoLeveling Front Right Wheel Speed Value
      TVD FR Wheel Speed
      Air suspension FR Wheel Speed
      Shift position ECM

      • Radio receiver assembly

      • Clearance warning ECU assembly

      • Certification ECU (smart key ECU assembly)

      • Blind spot monitor sensor LH

      • Torque vectoring differential ECU assembly

      • Skid control ECU (brake actuator assembly)

      • Stereo component equalizer assembly

      • Position control ECU and switch assembly LH

      • Position control ECU and switch assembly RH

      • Combination meter assembly*2

      • Forward recognition camera

      • Airbag ECU assembly

      • Main body ECU (multiplex network body ECU)

      • Driving support ECU assembly

      • Rear television camera assembly

      • Option connector (bus buffer ECU)

      • Headlight light control ECU sub-assembly LH

      		 Engine Neutral Position SW Signal
      Navigation System Reverse Signal
      Clearance Sonar Parking Signal
      Power Source Control Shift P Signal
      Blind Spot Monitor Master Reverse (Only for AT/CVT)
      TVD P Position
      ABS/VSC/TRC Shift Lever Position
      ASC Shift SW Status (N Range)
      Driver Seat Shift SW Position
      Passenger Seat Shift SW Position
      Ambient temperature Air conditioning amplifier assembly

      • Combination meter assembly

      • ECM

      • Torque vectoring differential ECU assembly

      • Power steering ECU assembly

      • Radio receiver assembly

      • Driving support ECU assembly

      • Option connector (bus buffer ECU)

      • Forward recognition camera

      		 Air Conditioner Ambient Temp Sensor
      Combination Meter Ambient Temperature
      Engine Ambient Temperature
      TVD Outside Temperature
      Driver door courtesy switch Main body ECU (multiplex network body ECU) -

      • Certification ECU (smart key ECU assembly)

      • Combination meter assembly*2

      • Radio receiver assembly

      • Option connector (bus buffer ECU)

      		 Main Body

      • FL Door Courtesy SW*5

      • FR Door Courtesy SW*6
      Steering angle sensor Steering sensor

      • Skid control ECU (brake actuator assembly)

      • Power steering ECU assembly

      • Blind spot monitor sensor LH

      • Driving support ECU assembly

      • Torque vectoring differential ECU assembly

      • Headlight light control ECU sub-assembly LH

      • Absorber control ECU

      • Airbag ECU assembly

      • Radio receiver assembly

      • Rear television camera assembly

      • Forward recognition camera

      • Combination meter assembly

      • ECM

      		 ABS/VSC/TRC Steering Angle Sensor
      EMPS Steering Angle Velocity
      Blind Spot Monitor Master Steering Angle
      Radar Cruise Steering Angle
      TVD Steering Angle
      HL AutoLeveling Steering Sensor Signal
      Air suspension Steering Angle
      Yaw rate sensor Yaw rate sensor

      • Skid control ECU (brake actuator assembly)

      • Driving support ECU assembly

      • Blind spot monitor sensor LH

      • Torque vectoring differential ECU assembly

      • Power steering ECU assembly

      • Forward recognition camera

      • Airbag ECU assembly

      • Radio receiver assembly

      		 ABS/VSC/TRC Yaw Rate Sensor
      Radar Cruise Yaw Rate Sensor
      Blind Spot Monitor Master Yaw Rate Sensor
      TVD Yaw Rate Value
      Acceleration sensor Yaw rate sensor

      • Skid control ECU (brake actuator assembly)

      • Driving support ECU assembly

      • Torque vectoring differential ECU assembly

      • ECM

      • Power steering ECU assembly

      • Airbag ECU assembly

      • Absorber control ECU

      • Forward recognition camera

      • Combination meter assembly

      • Radio receiver assembly

      		 ABS/VSC/TRC Deceleration Sensor
      Radar Cruise Deceleration Sensor 1
      TVD Back and Forth G
      Ignition switch condition Main body ECU (multiplex network body ECU)

      • Position control ECU and switch assembly LH

      • Position control ECU and switch assembly RH

      • Multiplex tilt and telescopic ECU

      • Radio receiver assembly

      • Certification ECU (smart key ECU assembly)

      • Outer mirror control ECU assembly (for driver side)

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

      • Rear television camera assembly

      • Option connector (bus buffer ECU)

      • Headlight light control ECU sub-assembly LH

      • Combination meter assembly*2

      		 Main Body IG SW
      Driver Seat Ignition Switch
      Passenger Seat Ignition Switch
      Tilt&Telescopic IG Switch
      Navigation System Ignition
      Starting Control Ignition
      Stop light switch signal Skid control ECU (brake actuator assembly)

      • Torque vectoring differential ECU assembly

      • Absorber control ECU

      • Driving support ECU assembly

      • Power steering ECU assembly

      • Radio receiver assembly

      • Airbag ECU assembly

      • Option connector (bus buffer ECU)

      		 ABS/VSC/TRC Stop Light SW
      TVD Stop Light SW
      Air suspension Stop Light Switch
      Radar Cruise Stop Light SW1 (MCPU)
      Driver side buckle switch signal Airbag ECU assembly -

      • Main body ECU (multiplex network body ECU)*4

      • Telematics transceiver

      		 SRS Airbag

      • Left side Buckle SW*5

      • Right side Buckle SW*6
      Main body ECU (multiplex network body ECU)*4 -

      • Combination meter assembly*2

      • Telematics transceiver

      • Radio receiver assembly

      		 - -
      Headlight switch Main body ECU (multiplex network body ECU) Headlight light control ECU sub-assembly LH

      • Air conditioning amplifier assembly

      • Combination meter assembly*2

      • Driving support ECU assembly

      • Radio receiver assembly

      • Forward recognition camera

      		 Main Body Dimmer SW
      HL AutoLeveling Headlight High Beam State
      Side turn signal Combination meter assembly

      • Blind spot monitor sensor LH

      • Driving support ECU assembly

      • Forward recognition camera

      • Headlight light control ECU sub-assembly LH

      • Radio receiver assembly

      		 Combination Meter Turn Signal Switch (Right)
      Blind spot monitor Master Turn Switch State
      Pre-Collision 2 Turn Light RH
      LKA/LDA Turn Signal Switch (Right)
      ECM power source voltage*1 ECM - - Engine Battery Voltage
      Combination meter assembly power source voltage*1 Combination meter assembly - - Combination Meter +B Voltage Value
      Skid control ECU (brake actuator assembly) power source voltage*1 Skid control ECU (brake actuator assembly) - - ABS/VSC/TRC IG1 Voltage Value
      Power steering ECU assembly power source voltage*1 Power steering ECU assembly - - EMPS IG Power Supply
      Radio receiver assembly power source voltage*1 Radio receiver assembly - - Navigation System Battery Voltage
      Headlight light control ECU sub-assembly LH power source voltage*1 Headlight light control ECU sub-assembly LH - - HL AutoLeveling +B Voltage Value
      Clearance sonar main switch condition*1 Clearance warning ECU assembly - - Clearance Sonar Main Switch
      Blind spot monitor sensor LH power source voltage*1 Blind spot monitor sensor LH - - Blind Spot Monitor Master Power Supply Voltage
      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
      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
      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
      Position control ECU and switch assembly RH power source voltage*1 Position control ECU and switch assembly RH - -

      • Passenger Seat*5

      • Driver Seat*6

      		 Power Voltage
      Multiplex tilt and telescopic ECU power source voltage*1 Multiplex tilt and telescopic ECU - - Tilt&Telescopic Power Source Voltage
      Torque vectoring differential ECU assembly power source voltage*1 Torque vectoring differential ECU assembly - - TVD Battery Voltage
      Spoiler control ECU assembly power source voltage*1 Spoiler control ECU assembly - - Active Rear Wing ECU Battery Voltage

      • *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 ECU assembly and sends the signal to other ECUs.

      • *5: for LHD

      • *6: for RHD

      • *7: According to the display on the Techstream, read the Data List.


        • Enter the following menus: Powertrain / Engine / Data List.

          Click here (w/ Canister Pump Module)

          Click here (w/o Canister Pump Module)

        • Enter the following menus: Chassis / ABS/VSC/TRC / Data List.

          Click here

        • Enter the following menus: Body Electrical / ASC / Data List.

          Click here

        • Enter the following menus: Chassis / EMPS / Data List.

          Click here

        • Enter the following menus: Body Electrical / Power Source Control / Data List.

          Enter the following menus: Body Electrical / Starting Control / Data List.

          Click here

        • Enter the following menus: Body Electrical / Combination Meter / Data List.

          Click here

        • Enter the following menus: Chassis / Air suspension / Data List.

          Click here

        • Enter the following menus: Chassis / TVD / Data List.

          Click here

        • Enter the following menus: Body Electrical / Air Conditioner / Data List.

          Click here

        • Enter the following menus: Body Electrical / Navigation System / Data List.

          Click here (w/ Audio and Visual System (for 10.3 Inch Display))

          Click here (w/ Audio and Visual System (for 7 Inch Display))

          Click here (w/ Navigation System)

        • Enter the following menus: Body Electrical / Driver Seat, Passenger Seat / Data List.

          Click here

        • Enter the following menus: Body Electrical / Clearance Sonar / Data List.

          Click here

        • Enter the following menus: Body Electrical / HL AutoLeveling / Data List.

          Click here

        • Enter the following menus: Body Electrical / Blind Spot Monitor Master / Data List.

          Click here

        • Enter the following menus: Body Electrical / Main Body / Data List.

          Click here

          Click here

        • Enter the following menus: Powertrain / Radar Cruise / Data List.

          Click here

        • Enter the following menus: Body Electrical / Tilt & Telescopic / Data List.

          Click here

        • Enter the following menus: Body Electrical / SRS Airbag / Data List.

          Click here

        • Enter the following menus: Chassis / LKA/LDA / Data List.

          Click here

        • Enter the following menus: Body Electrical / Pre-Collision 2 / Data List.

          Click here

        • Enter the following menus: Body Electrical / Mirror L, Mirror R / Data List.

          Click here

        • Enter the following menus: Body Electrical / Active Rear Wing / Data List.

          Click here