CAN COMMUNICATION SYSTEM(for LHD with Central Gateway ECU) 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 Note
        - CGW Central Gateway ECU (Network Gateway ECU) - Installed on all vehicles
        V Bus DLC3 DLC3 - Installed on all vehicles
        Bus 2 ENG ECM ECM (Engine) Installed on all vehicles
        SMT Certification ECU (Smart Key ECU Assembly) Certification (Smart) Vehicles with entry and start system
        A/C Air Conditioning Amplifier Assembly Air Conditioning Amplifier Vehicles with automatic air conditioning system or manual air conditioning system
        AWD 4 Wheel Drive Control ECU Four Wheel Drive Control Vehicles with 4WD
        BRK Brake Actuator Assembly (Skid Control ECU) Skid Control (ABS/VSC/TRAC) Installed on all vehicles
        SRS Airbag Sensor Assembly Airbag Installed on all vehicles
        LIT Headlight Leveling ECU Assembly Headlight swivel (AFS) Vehicles with LED headlight or headlight cleaner system
        S&S Engine Stop and Start ECU Stop and Go/Start Vehicles with stop and start system
        STR Spiral with Sensor Cable Sub-assembly (Steering Angle Sensor) Spiral cable (Steering Angle Sensor) Installed on all vehicles
        MET Combination Meter Assembly Combination Meter Installed on all vehicles
        Bus 3 AV Navigation Receiver Assembly Display and Navigation (AVN1) Vehicles with navigation system
        Radio and Display Receiver Assembly Display and Navigation (AVN1) Vehicles with audio and visual system (for radio and display type)
        Bus 5 F-CAM Forward Recognition Camera Front Camera Module Installed on all vehicles
        F-MR Millimeter Wave Radar Sensor Assembly Front Radar 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.*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 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, 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 and V bus (the bus that connects the DLC3 to the central 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 ignition 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.

      Open in both CAN branch lines of HV on the bus 4

      B0024V3C01
      *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

      B00266BC01
      *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.*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

      B002838C01
      *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

      B0026LWC01
      *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 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.)

      B0024Q4C01
      *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.)

      B0024OHC01
      *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
      B0028FFC01
      *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) is suspected.

      Open in both CAN branch lines in the V bus

      B0025VQC01
      *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 trouble cannot be determined solely from the DTCs. Perform troubleshooting according to "How to Proceed with Troubleshooting".

      Click here

    • If system function temporarily returns to normal, DTCs may not be output again even though the following DTC check procedures are used.


    1. ECM / GTS Display "Engine"

      Tech Tips

      DTC communication uses the CAN communication system.


      Powertrain > Engine > Trouble Codes
      DTC No. Detection Item DTC Detection Condition DTC Detection Precondition DTC Check Procedure Warning Indication in Meter DTC Storage Method
      U1103 Lost Communication with Stop and Start Control Module The ECM is unable to receive certain data from the engine stop and start ECU for 1 second or more.

      Both conditions are met:


      • 1 second or more elapses after turning the ignition switch to ON.

      • The ECM power supply voltage is 10.5 V or higher.

      		 Turn the ignition switch to ON and wait at least 2 seconds. Displays messages on the multi-information display. The DTC remains stored until it is cleared using the GTS.

    2. BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU) / GTS Display "ABS/VSC/TRC"

      Tech Tips

      DTC communication uses the CAN communication system.


      Chassis > ABS/VSC/TRC > Trouble Codes
      DTC No. Detection Item DTC Detection Condition DTC Detection Precondition DTC Check Procedure Warning Indication in Meter DTC Storage Method
      U0073 Control Module Communication Bus Off

      Either condition is met:


      • The response sent to the brake actuator assembly (skid control ECU) from the airbag sensor assembly is invalid for 1 second or more.

      • The following condition occurs 10 times consecutively within 60 seconds: The response sent to the brake actuator assembly (skid control ECU) from the airbag sensor assembly is invalid at least once within 5 seconds.

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

      Both conditions are met:


      • 1 second or more elapses after turning the ignition switch to ON.

      • The brake actuator assembly (skid control ECU) power supply voltage is between 10 and 17.4 V.

      		 Turn the ignition switch to ON and wait at least 60 seconds.

      • ABS indicator light illuminates.

      • SLIP indicator light illuminates.

      		 The DTC remains stored until it is cleared using the GTS.
      U0073 Control Module Communication Bus Off

      Either condition is met:


      • The response sent to the brake actuator assembly (skid control ECU) from the spiral with sensor cable sub-assembly (steering angle sensor) is invalid for 1 second or more.

      • The following condition occurs 10 times consecutively within 60 seconds: The response sent to the brake actuator assembly (skid control ECU) from the spiral with sensor cable sub-assembly (steering angle sensor) is invalid at least once within 5 seconds.

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

      Both conditions are met:


      • 1 second or more elapses after turning the ignition switch to ON.

      • The brake actuator assembly (skid control ECU) power supply voltage is between 10 and 17.4 V.

      		 Turn the ignition switch to ON and wait at least 60 seconds.

      • ABS indicator light illuminates.

      • SLIP indicator light illuminates.

      		 The DTC remains stored until it is cleared using the GTS.
      U0100 Lost Communication With ECM/PCM "A" The brake actuator assembly (skid control ECU) is unable to receive certain data from the ECM for 2 seconds or more.

      All conditions are met:


      • 1 second or more elapses after turning the ignition switch to ON.

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

      • The brake actuator assembly (skid control ECU) power supply voltage is between 10 and 17.4 V.

      		 Drive the vehicle for 3 seconds at a speed of 15 km/h (9 mph) or more. SLIP indicator light illuminates. The DTC remains stored until it is cleared using the GTS.
      U0114 Lost Communication With Four-Wheel Drive Clutch Control Module The brake actuator assembly (skid control ECU) is unable to receive certain data from the 4 wheel drive control ECU for 1.2 seconds or more.

      Both conditions are met:


      • 1 second or more elapses after turning the ignition switch to ON.

      • The brake actuator assembly (skid control ECU) power supply voltage is between 10 and 17.4 V.

      		 Turn the ignition switch to ON and wait at least 2.2 seconds.

      • ABS indicator light illuminates.

      • SLIP indicator light illuminates.

      		 The DTC remains stored until it is cleared using the GTS.
      U0124 Lost Communication With Lateral Acceleration Sensor Module

      Either condition is met:


      • The brake actuator assembly (skid control ECU) is unable to receive certain data from the airbag sensor assembly for 1 second or more.

      • The following condition occurs 10 times or more consecutively within 60 seconds: The brake actuator assembly (skid control ECU) is unable to receive certain data from the airbag sensor assembly at least once within 5 seconds.

      Both conditions are met:


      • 1 second or more elapses after turning the ignition switch to ON.

      • The brake actuator assembly (skid control ECU) power supply voltage is between 10 and 17.4 V.

      		 Turn the ignition switch to ON and wait at least 60 seconds.

      • ABS indicator light illuminates.

      • SLIP indicator light illuminates.

      		 The DTC remains stored until it is cleared using the GTS.
      U0126 Lost Communication With Steering Angle Sensor Module

      Either condition is met:


      • The brake actuator assembly (skid control ECU) is unable to receive certain data from the spiral with sensor cable sub-assembly (steering angle sensor) for 1 second or more.

      • The following condition occurs 10 times or more consecutively within 60 seconds: The brake actuator assembly (skid control ECU) is unable to receive certain data from the spiral with sensor cable sub-assembly (steering angle sensor) at least once within 5 seconds.

      Both conditions are met:


      • 1 second or more elapses after turning the ignition switch to ON.

      • The brake actuator assembly (skid control ECU) power supply voltage is between 10 and 17.4 V.

      		 Turn the ignition switch to ON and wait at least 60 seconds. SLIP indicator light illuminates. The DTC remains stored until it is cleared using the GTS.

    3. AIR CONDITIONING AMPLIFIER ASSEMBLY (for Automatic Air Conditioning System, Manual Air Conditioning System) / GTS Display "Air Conditioner"

      Tech Tips

      DTC communication uses the CAN communication system.


      Body Electrical > Air Conditioner > Trouble Codes
      DTC No. Detection Item DTC Detection Condition DTC Detection Precondition DTC Check Procedure Warning Indication in Meter DTC Storage Method
      U0100 Lost Communication With ECM/PCM "A" The air conditioning amplifier assembly is unable to receive certain data from the ECM for 5 seconds or more.

      Both conditions are met:


      • The ignition switch is ON.

      • The air conditioning amplifier assembly power supply voltage is 10 V or higher.

      		 Turn the ignition switch to ON and wait at least 5 seconds. - The DTC remains stored until it is cleared using the GTS.
      U0155 Lost Communication With Instrument Panel Cluster (IPC) Control Module The air conditioning amplifier assembly is unable to receive certain data from the combination meter assembly for 5 seconds or more.

      Both conditions are met:


      • The ignition switch is ON.

      • The air conditioning amplifier assembly power supply voltage is 10 V or higher.

      		 Turn the ignition switch to ON and wait at least 5 seconds. - The DTC remains stored until it is cleared using the GTS.

    4. COMBINATION METER ASSEMBLY / GTS Display "Combination Meter"

      Tech Tips

      DTC communication uses the CAN communication system.


      Body Electrical > Combination Meter > Trouble Codes
      DTC No. Detection Item DTC Detection Condition DTC Check Procedure DTC Check Procedure Warning Indication in Meter DTC Storage Method
      U0100 Lost Communication with ECM/PCM "A" The combination meter assembly is unable to receive certain data from the ECM for 2 seconds or more.

      Both conditions are met:


      • The ignition switch is ON.

      • The voltage at the IG power supply terminal of the combination meter assembly is 11.5 V or higher.

      		 Turn the ignition switch to ON and wait at least 2 seconds. MIL illuminates. The DTC remains stored until it is cleared using the GTS.
      U0129 Lost Communication with Brake System Control Module

      Either condition is met:


      • The combination meter assembly is unable to receive certain data from the brake actuator assembly (skid control ECU) for 2 seconds or more.

      • The combination meter assembly is unable to receive certain data from the brake actuator assembly (skid control ECU) for 3 seconds or more.

      Both conditions are met:


      • The ignition switch is ON.

      • The voltage at the IG power supply terminal of the combination meter assembly is 11.5 V or higher.

      		 Turn the ignition switch to ON and wait at least 3 seconds. SLIP indicator light illuminates. The DTC remains stored until it is cleared using the GTS.
      U0151 Lost Communication with Restraints Control Module The combination meter assembly is unable to receive certain data from the airbag sensor assembly for 10 seconds or more.

      Both conditions are met:


      • The ignition switch is ON.

      • The voltage at the IG power supply terminal of the combination meter assembly is 11.5 V or higher.

      		 Turn the ignition switch to ON and wait at least 10 seconds. The SRS warning light illuminates. The DTC remains stored until it is cleared using the GTS.
      U0235 Lost Communication with Cruise Control Front Distance Range Sensor The combination meter assembly is unable to receive certain data from the millimeter wave radar sensor assembly for 10 seconds or more.

      Both conditions are met:


      • The ignition switch is ON.

      • The voltage at the IG power supply terminal of the combination meter assembly is 11.5 V or higher.

      		 Turn the ignition switch to ON and wait at least 10 seconds. - The DTC remains stored until it is cleared using the GTS.

    5. NAVIGATION RECEIVER ASSEMBLY (w/ Navigation System) / GTS Display "Navigation System"

      Tech Tips

      DTC communication uses the CAN communication system.


      Body Electrical > Navigation System > Trouble Codes
      DTC No. Detection Item DTC Detection Condition DTC Detection Precondition DTC Check Procedure Warning Indication in Meter DTC Storage Method
      U0073 Sending Malfunction (Navigation to APGS) The navigation receiver assembly is unable to send or receive data 10 times consecutively. - Turn the ignition switch to ON and wait at least 1 second. - The DTC remains stored until it is cleared using the GTS.
      U0100 Engine ECU Communication

      Either condition is met:


      • The navigation receiver assembly is unable to receive certain data from the ECM for 4 seconds or more.

      • The navigation receiver assembly is unable to receive certain data from the ECM for 12 seconds or more.

      Both conditions are met:


      • 1 second or more elapse after turning the ignition switch to ON.

      • The navigation receiver assembly power supply voltage is 9.5 V or higher.

      		 Turn the ignition switch to ON and wait at least 13 seconds. - The DTC remains stored until it is cleared using the GTS.
      U0129 VSC(ECB*)ECU Communication The navigation receiver assembly is unable to receive certain data from the brake actuator assembly (skid control ECU) for 1 second or more.

      Both conditions are met:


      • 1 second or more elapse after turning the ignition switch to ON.

      • The navigation receiver assembly power supply voltage is 9.5 V or higher.

      		 Turn the ignition switch to ON and wait at least 2 seconds. - The DTC remains stored until it is cleared using the GTS.
      U0155 Meter ECU Communication

      Either condition is met:


      • The navigation receiver assembly is unable to receive certain data from the combination meter assembly for 10 seconds or more.

      • The navigation receiver assembly is unable to receive certain data from the combination meter assembly for 30 seconds or more.

      Both conditions are met:


      • 1 second or more elapse after turning the ignition switch to ON.

      • The navigation receiver assembly power supply voltage is 9.5 V or higher.

      		 Turn the ignition switch to ON and wait at least 31 seconds. - The DTC remains stored until it is cleared using the GTS.

      ECB*: Electronically Controlled Brake System

    6. RADIO AND DISPLAY RECEIVER ASSEMBLY (w/ Audio and Visual System [for Radio and Display Type]) / GTS Display "Navigation System"

      Tech Tips

      DTC communication uses the CAN communication system.


      Body Electrical > Navigation System > Trouble Codes
      DTC No. Detection Item DTC Detection Condition DTC Detection Precondition DTC Check Procedure Warning Indication in Meter DTC Storage Method
      U0073 Sending Malfunction (Navigation to APGS) The radio and display receiver assembly is unable to send or receive data 10 times consecutively. - Turn the ignition switch to ON and wait at least 1 second. - The DTC remains stored until it is cleared using the GTS.
      U0100 Engine ECU Communication

      Either condition is met:


      • The radio and display receiver assembly is unable to receive certain data from the ECM for 4 seconds or more.

      • The radio and display receiver assembly is unable to receive certain data from the ECM for 12 seconds or more.

      Both conditions are met:


      • 1 second or more elapse after turning the ignition switch to ON.

      • The radio and display receiver assembly power supply voltage is 9.5 V or higher.

      		 Turn the ignition switch to ON and wait at least 13 seconds. - The DTC remains stored until it is cleared using the GTS.
      U0129 VSC(ECB*)ECU Communication The radio and display receiver assembly is unable to receive certain data from the brake actuator assembly (skid control ECU) for 1 second or more.

      Both conditions are met:


      • 1 second or more elapse after turning the ignition switch to ON.

      • The radio and display receiver assembly power supply voltage is 9.5 V or higher.

      		 Turn the ignition switch to ON and wait at least 2 seconds. - The DTC remains stored until it is cleared using the GTS.
      U0155 Meter ECU Communication

      Either condition is met:


      • The radio and display receiver assembly is unable to receive certain data from the combination meter assembly for 10 seconds or more.

      • The radio and display receiver assembly is unable to receive certain data from the combination meter assembly for 30 seconds or more.

      Both conditions are met:


      • 1 second or more elapse after turning the ignition switch to ON.

      • The radio and display receiver assembly power supply voltage is 9.5 V or higher.

      		 Turn the ignition switch to ON and wait at least 31 seconds. - The DTC remains stored until it is cleared using the GTS.
      U0164 Air Conditioner ECU Communication The radio and display receiver assembly is unable to receive certain data from the air conditioning amplifier assembly for 10 seconds or more.

      Both conditions are met:


      • 1 second or more elapse after turning the ignition switch to ON.

      • The radio and display receiver assembly power supply voltage is 9.5 V or higher.

      		 Turn the ignition switch to ON and wait at least 11 seconds. - The DTC remains stored until it is cleared using the GTS.

      ECB*: Electronically Controlled Brake System

    7. 4 WHEEL DRIVE CONTROL ECU (for 4WD) / GTS Display "Four Wheel Drive"

      Tech Tips

      DTC communication uses the CAN communication system.


      Powertrain > Four Wheel Drive > Trouble Codes
      DTC No. Detection Item DTC Detection Condition DTC Detection Precondition DTC Check Procedure Warning Indication in Meter DTC Storage Method
      U0100 Lost Communication with ECM/PCM "A"

      Either condition is met:


      • The 4 wheel drive control ECU is unable to receive certain data from the ECM for 1.85 seconds or more.

      • The 4 wheel drive control ECU is unable to receive certain data from the ECM for 5.12 seconds or more.

      Both conditions are met:


      • 3 seconds or more elapse after turning the ignition switch to ON.

      • The 4 wheel drive control ECU power supply voltage is 10 V or higher.

      		 Turn the ignition switch to ON and wait at least 8.12 seconds.

      • The low speed four-wheel drive indicator light blinks.

      • The message is displayed on multi-information display.

      		 The DTC remains stored until it is cleared using the GTS.
      U0122 Lost Communication With Vehicle Dynamics Control Module The 4 wheel drive control ECU is unable to receive certain data from the brake actuator assembly (skid control ECU) for 0.72 seconds or more.

      Both conditions are met:


      • 3 seconds or more elapse after turning the ignition switch to ON.

      • The 4 wheel drive control ECU power supply voltage is 10 V or higher.

      		 Turn the ignition switch to ON and wait at least 3.72 seconds.

      • The low speed four-wheel drive indicator light blinks.

      • The rear differential lock indicator blinks.

      • The message is displayed on multi-information display.

      		 The DTC remains stored until it is cleared using the GTS.

    8. CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (w/ Entry and Start System) / GTS Display "Entry&Start"

      Tech Tips

      DTC communication uses the CAN communication system.


      Body Electrical > Entry&Start > Trouble Codes
      DTC No. Detection Item DTC Detection Condition DTC Detection Precondition DTC Check Procedure Warning Indication in Meter DTC Storage Method
      U0100 Lost Communication With ECM/PCM "A" The certification ECU (smart key ECU assembly) is unable to receive certain data from the ECM for 10 seconds or more.

      Both conditions are met:


      • 10 seconds or more elapse after a power source mode change is detected (+B changes from off to on, ACC changes between on and off, or IG changes between on and off).

      • The certification ECU (smart key ECU assembly) power supply voltage is 10 V or higher.

      		 Wait 20 seconds after turning the ignition switch ACC or ON. - The DTC remains 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) is unable to receive certain data from the combination meter assembly for 10 seconds or more.

      Both conditions are met:


      • 10 seconds or more elapse after a power source mode change is detected (+B changes from off to on, ACC changes between on and off, or IG changes between on and off).

      • The certification ECU (smart key ECU assembly) power supply voltage is 10 V or higher.

      		 Wait 20 seconds after turning the ignition switch ACC or ON. - The DTC remains stored until it is cleared using the GTS.
      U1103 Lost Communication with Stop and Start Control Module The certification ECU (smart key ECU assembly) is unable to receive certain data from one of the connected ECUs for 10 seconds or more.

      Both conditions are met:


      • 10 seconds or more elapse after a power source mode change is detected (+B changes from off to on, ACC changes between on and off, or IG changes between on and off).

      • The certification ECU (smart key ECU assembly) power supply voltage is 10 V or higher.

      		 Wait 20 seconds after turning the ignition switch ACC or ON. - The DTC remains stored until it is cleared using the GTS.

    9. CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (w/ Entry and Start System) / GTS Display "Power Source Control"

      Tech Tips

      DTC communication uses the CAN communication system.


      Body Electrical > Power Source Control > Trouble Codes
      DTC No. Detection Item DTC Detection Condition DTC Detection Precondition DTC Check Procedure Warning Indication in Meter DTC Storage Method
      U0100 ECM Communication The certification ECU (smart key ECU assembly) is unable to receive certain data from the ECM for 10 seconds or more.

      Both conditions are met:


      • 10 seconds or more elapse after a power source mode change is detected (+B changes from off to on, ACC changes between on and off, or IG changes between on and off).

      • The certification ECU (smart key ECU assembly) power supply voltage is 10 V or higher.

      		 Wait 20 seconds after turning the ignition switch ACC or ON. - The DTC remains stored until it is cleared using the GTS.
      U0129 Vehicle Speed Signal Communication The certification ECU (smart key ECU assembly) is unable to receive certain data from the brake actuator assembly (skid control ECU) for 10 seconds or more.

      Both conditions are met:


      • 10 seconds or more elapse after a power source mode change is detected (+B changes from off to on, ACC changes between on and off, or IG changes between on and off).

      • The certification ECU (smart key ECU assembly) power supply voltage is 10 V or higher.

      		 Wait 20 seconds after turning the ignition switch ACC or ON. - The DTC remains 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) is unable to receive certain data from the combination meter assembly for 10 seconds or more.

      Both conditions are met:


      • 10 seconds or more elapse after a power source mode change is detected (+B changes from off to on, ACC changes between on and off, or IG changes between on and off).

      • The certification ECU (smart key ECU assembly) power supply voltage is 10 V or higher.

      		 Wait 20 seconds after turning the ignition switch ACC or ON. - The DTC remains stored until it is cleared using the GTS.
      U1103 Lost Communication with Stop and Start Control Module The certification ECU (smart key ECU assembly) is unable to receive certain data from one of the connected ECUs for 10 seconds or more.

      Both conditions are met:


      • 10 seconds or more elapse after a power source mode change is detected (+B changes from off to on, ACC changes between on and off, or IG changes between on and off).

      • The certification ECU (smart key ECU assembly) power supply voltage is 10 V or higher.

      		 Wait 20 seconds after turning the ignition switch ACC or ON. - The DTC remains stored until it is cleared using the GTS.

    10. CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (w/ Entry and Start System) / GTS Display "Starting Control"

      Tech Tips

      DTC communication uses the CAN communication system.


      Body Electrical > Starting Control > Trouble Codes
      DTC No. Detection Item DTC Detection Condition DTC Detection Precondition DTC Check Procedure Warning Indication in Meter DTC Storage Method
      U0100 Lost Communication with ECM/PCM "A" The certification ECU (smart key ECU assembly) is unable to receive certain data from the ECM for 10 seconds or more.

      Both conditions are met:


      • 10 seconds or more elapse after a power source mode change is detected (+B changes from off to on, ACC changes between on and off, or IG changes between on and off).

      • The certification ECU (smart key ECU assembly) power supply voltage is 10 V or higher.

      		 Wait 20 seconds after turning the ignition switch ACC or ON. - The DTC remains stored until it is cleared using the GTS.

    11. HEADLIGHT LEVELING ECU ASSEMBLY (for LED Headlight or w/ Headlight Cleaner System) / GTS Display "HL AutoLeveling"

      Tech Tips

      DTC communication uses the CAN communication system.


      Body Electrical > HL AutoLeveling > Trouble Codes
      DTC No. Detection Item DTC Detection Condition DTC Detection Precondition DTC Check Procedure Warning Indication in Meter DTC Storage Method
      U0100 Lost Communication with ECM/PCM "A" The headlight leveling ECU assembly is unable to receive certain data from the ECM for 10 seconds or more.

      Both conditions are met:


      • 10 seconds or more elapse after turning the ignition switch to ON.

      • The headlight leveling ECU assembly power supply voltage is 9.5 V or higher

      		 Turn the ignition switch to ON and wait at least 20 seconds. - The DTC remains stored until it is cleared using the GTS.
      U0129 Lost Communication with Brake System Control Module The headlight leveling ECU assembly is unable to receive certain data from the brake actuator assembly (skid control ECU) for 10 seconds or more.

      Both conditions are met:


      • 10 seconds or more elapse after turning the ignition switch to ON.

      • The headlight leveling ECU assembly power supply voltage is 9.5 V or higher

      		 Turn the ignition switch to ON and wait at least 20 seconds. - The DTC remains stored until it is cleared using the GTS.
      U0142 Lost Communication with Body Control Module "B" The headlight leveling ECU assembly is unable to receive certain data from the combination meter assembly for 10 seconds or more.

      Both conditions are met:


      • 10 seconds or more elapse after turning the ignition switch to ON.

      • The headlight leveling ECU assembly power supply voltage is 9.5 V or higher

      		 Turn the ignition switch to ON and wait at least 20 seconds. - The DTC remains stored until it is cleared using the GTS.
      U1000* CAN Communication Failure(Message Registry) CAN communication malfunction (message register) Turn the ignition switch to ON. Turn the ignition switch to ON. - The DTC remains stored until it is cleared using the GTS.

      *: Refer to the Automatic Headlight Beam Level Control System.

      Click here

    12. ENGINE STOP AND START ECU (w/ Stop and Start System) / GTS Display "Stop and Start"

      Tech Tips

      DTC communication uses the CAN communication system.


      Powertrain > Stop and Start > Trouble Codes
      DTC No. Detection Item DTC Detection Condition DTC Detection Precondition DTC Check Procedure Warning Indication in Meter DTC Storage Method
      U0100 Lost Communication with ECM/PCM "A" The engine stop and start ECU is unable to receive certain data from the ECM for 0.92 seconds or more.

      Both conditions are met:


      • 1 second or more elapse after turning the ignition switch to ON.

      • The engine stop and start ECU power supply voltage is 10.5 V or higher

      		 Turn the ignition switch to ON and wait at least 1.92 seconds. Stop and start indicator light illuminates. The DTC remains stored until it is cleared using the GTS.
      U0114 Lost Communication with Four-Wheel Drive Clutch Control Module The engine stop and start ECU is unable to receive certain data from the 4 wheel drive control ECU for 0.92 seconds or more.

      Both conditions are met:


      • 1 second or more elapse after turning the ignition switch to ON.

      • The engine stop and start ECU power supply voltage is 10.5 V or higher

      		 Turn the ignition switch to ON and wait at least 1.92 seconds. Stop and start indicator light illuminates. The DTC remains stored until it is cleared using the GTS.
      U0121 Lost Communication with Anti-Lock Brake System (ABS) Control Module The engine stop and start ECU is unable to receive certain data from the brake actuator assembly (skid control ECU) for 2.2 seconds or more.

      Both conditions are met:


      • 2.1 seconds or more elapse after turning the ignition switch to ON.

      • The engine stop and start ECU power supply voltage is 10.5 V or higher

      		 Turn the ignition switch to ON and wait at least 4.3 seconds. Stop and start indicator light illuminates. The DTC remains stored until it is cleared using the GTS.
      U0126 Lost Communication with Steering Angle Sensor Module The engine stop and start ECU is unable to receive certain data from the spiral with sensor cable sub-assembly (steering angle sensor) for 0.72 seconds or more.

      Both conditions are met:


      • 1 second or more elapse after turning the ignition switch to ON.

      • The engine stop and start ECU power supply voltage is 10.5 V or higher

      		 Turn the ignition switch to ON and wait at least 1.72 seconds. Stop and start indicator light illuminates. The DTC remains stored until it is cleared using the GTS.
      U0151 Lost Communication with SRS Airbag ECU The engine stop and start ECU is unable to receive certain data from the airbag sensor assembly for 10.6 seconds or more.

      Both conditions are met:


      • 1 second or more elapse after turning the ignition switch to ON.

      • The engine stop and start ECU power supply voltage is 10.5 V or higher

      		 Turn the ignition switch to ON and wait at least 11.6 seconds. Stop and start indicator light illuminates. The DTC remains stored until it is cleared using the GTS.
      U0155 Lost Communication with Instrument Panel Cluster Control Module (Combination Meter) The engine stop and start ECU is unable to receive certain data from the combination meter assembly for 3.6 seconds or more.

      Both conditions are met:


      • 1 second or more elapse after turning the ignition switch to ON.

      • The engine stop and start ECU power supply voltage is 10.5 V or higher

      		 Turn the ignition switch to ON and wait at least 4.6 seconds. Stop and start indicator light illuminates. The DTC remains stored until it is cleared using the GTS.
      U0164 Lost Communication with HVAC Control Module The engine stop and start ECU is unable to receive certain data from the air conditioning amplifier assembly for 10.6 seconds or more.

      Both conditions are met:


      • 1 second or more elapse after turning the ignition switch to ON.

      • The engine stop and start ECU power supply voltage is 10.5 V or higher

      		 Turn the ignition switch to ON and wait at least 11.6 seconds. Stop and start indicator light illuminates. The DTC remains stored until it is cleared using the GTS.

    13. FORWARD RECOGNITION CAMERA

      Tech Tips

      DTC communication uses the CAN communication system.


      1. GTS Display "LKA/LDA"


        Chassis > LKA/LDA > Trouble Codes
        DTC No. Detection Item DTC Detection Condition DTC Detection Precondition DTC Check Procedure Warning Indication in Meter DTC Storage Method
        U0123 Lost Communication with Yaw Rate Sensor Module The forward recognition camera is unable to receive certain data from the airbag sensor assembly for 5 seconds or more.

        All conditions are met:


        • 2 seconds or more elapse after turning the ignition switch to ON.

        • The vehicle speed is 5 km/h (approximately 4 mph) or more.

        • The forward recognition camera power supply voltage is 10 V or higher

        		 Drive the vehicle for 7 seconds at a speed of 5 km/h (approximately 4 mph) or more. Warning message is displayed on the multi-information display. The DTC is stored only while the malfunction is present.
        U0126 Lost Communication with Steering Angle Sensor Module The forward recognition camera is unable to receive certain data from the spiral with sensor cable sub-assembly (steering angle sensor) for 5 seconds or more.

        Both conditions are met:


        • 2 seconds or more elapse after turning the ignition switch to ON.

        • The forward recognition camera power supply voltage is 10 V or higher

        		 Turn the ignition switch to ON and wait at least approximately 7 seconds. Warning message is displayed on the multi-information display. The DTC is stored only while the malfunction is present.
        U0129 Lost Communication with Brake System Control Module The forward recognition camera is unable to receive certain data from the brake actuator assembly (skid control ECU) for 5 seconds or more.

        Both conditions are met:


        • 2 seconds or more elapse after turning the ignition switch to ON.

        • The forward recognition camera power supply voltage is 10 V or higher

        		 Turn the ignition switch to ON and wait at least approximately 7 seconds. Warning message is displayed on the multi-information display. The DTC is stored only while the malfunction is present.
        U0142 Lost Communication with Body Control Module "B" The forward recognition camera is unable to receive certain data from the combination meter assembly for 5 seconds or more.

        Both conditions are met:


        • 2 seconds or more elapse after turning the ignition switch to ON.

        • The forward recognition camera power supply voltage is 10 V or higher

        		 Turn the ignition switch to ON and wait at least approximately 7 seconds. Warning message is displayed on the multi-information display. The DTC is stored only while the malfunction is present.
        U0155 Lost Communication with Instrument Panel Cluster (IPC) Control Module (Combination Meter) The forward recognition camera is unable to receive certain data from the combination meter assembly for 50 seconds or more.

        Both conditions are met:


        • 2 seconds or more elapse after turning the ignition switch to ON.

        • The forward recognition camera power supply voltage is 10 V or higher

        		 Turn the ignition switch to ON and wait at least approximately 52 seconds. Warning message is displayed on the multi-information display. The DTC is stored only while the malfunction is present.
        U0235* Lost Communication with Cruise Control Front Distance Range Sensor The forward recognition camera is unable to receive certain data from the millimeter wave radar sensor assembly for 5 seconds or more.

        All conditions are met:


        • 2 seconds or more elapse after turning the ignition switch to ON.

        • The vehicle speed is 5 km/h (approximately 4 mph) or more.

        • The forward recognition camera power supply voltage is 10 V or higher

        		 Drive the vehicle for 7 seconds at a speed of 5 km/h (approximately 4 mph) or more. Warning message is displayed on the multi-information display. The DTC is stored only while the malfunction is present.

        *: Refer to the Lane Departure Alert System.

        Click here

      2. GTS Display "Front Recognition Camera"


        Chassis > Front Recognition Camera > Trouble Codes
        DTC No. Detection Item DTC Detection Condition DTC Detection Precondition DTC Check Procedure Warning Indication in Meter DTC Storage Method
        U0101 Lost Communication with TCM The forward recognition camera is unable to receive certain data from the ECM for 5 seconds or more.

        All conditions are met:


        • 2 seconds or more elapse after turning the ignition switch to ON.

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

        • The forward recognition camera power supply voltage is 10 V or higher

        		 Drive the vehicle for 7 seconds at a speed of 5 km/h (3 mph) or more. - The DTC remains stored until it is cleared using the GTS.
        U0123 Lost Communication with Yaw Rate Sensor Module The forward recognition camera is unable to receive certain data from the airbag sensor assembly for 5 seconds or more.

        All conditions are met:


        • 2 seconds or more elapse after turning the ignition switch to ON.

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

        • The forward recognition camera power supply voltage is 10 V or higher

        		 Drive the vehicle for 7 seconds at a speed of 5 km/h (3 mph) or more. - The DTC remains stored until it is cleared using the GTS.
        U0126 Lost Communication with Steering Angle Sensor Module The forward recognition camera is unable to receive certain data from the spiral with sensor cable sub-assembly (steering angle sensor) for 5 seconds or more.

        All conditions are met:


        • 2 seconds or more elapse after turning the ignition switch to ON.

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

        • The forward recognition camera power supply voltage is 10 V or higher

        		 Drive the vehicle for 7 seconds at a speed of 5 km/h (3 mph) or more. - The DTC remains stored until it is cleared using the GTS.
        U0129 Lost Communication with Brake System Control Module The forward recognition camera is unable to receive certain data from the brake actuator assembly (skid control ECU) for 5 seconds or more.

        All conditions are met:


        • 2 seconds or more elapse after turning the ignition switch to ON.

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

        • The forward recognition camera power supply voltage is 10 V or higher

        		 Drive the vehicle for 7 seconds at a speed of 5 km/h (3 mph) or more. - The DTC remains stored until it is cleared using the GTS.
        U0142 Lost Communication with Body Control Module "B" The forward recognition camera is unable to receive certain data from the combination meter assembly for 5 seconds or more.

        All conditions are met:


        • 2 seconds or more elapse after turning the ignition switch to ON.

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

        • The forward recognition camera power supply voltage is 10 V or higher

        		 Drive the vehicle for 7 seconds at a speed of 5 km/h (3 mph) or more. - The DTC remains stored until it is cleared using the GTS.
        U0155 Lost Communication with Instrument Panel Cluster (IPC) Control Module The forward recognition camera is unable to receive certain data from the combination meter assembly for 50 seconds or more.

        All conditions are met:


        • 2 seconds or more elapse after turning the ignition switch to ON.

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

        • The forward recognition camera power supply voltage is 10 V or higher

        		 Drive the vehicle for 52 seconds at a speed of 5 km/h (3 mph) or more. - The DTC remains stored until it is cleared using the GTS.
        U0235* Lost Communication with Cruise Control Front Distance Range Sensor The forward recognition camera is unable to receive certain data from the millimeter wave radar sensor assembly for 5 seconds or more.

        All conditions are met:


        • 2 seconds or more elapse after turning the ignition switch to ON.

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

        • The forward recognition camera power supply voltage is 10 V or higher

        		 Drive the vehicle for 7 seconds at a speed of 5 km/h (3 mph) or more. - The DTC remains stored until it is cleared using the GTS.

        *: Refer to the Forward Recognition Camera System.

        Click here

      3. GTS Display "Road Sign Assist"


        Body Electrical > Road Sign Assist > Trouble Codes
        DTC No. Detection Item DTC Detection Condition DTC Detection Precondition DTC Check Procedure Warning Indication in Meter DTC Storage Method
        U0123 Lost Communication with Yaw Rate Sensor Module The forward recognition camera is unable to receive certain data from the airbag sensor assembly for approximately 3 seconds or more.

        Both conditions are met:


        • 3 seconds or more elapse after turning the ignition switch to ON.

        • The forward recognition camera power supply voltage is 10 V or higher

        		 Turn the ignition switch to ON and wait at least approximately 6 seconds. Warning message is displayed on the multi-information display. The DTC remains stored until it is cleared using the GTS.
        U0129 Lost Communication with Brake System Control Module The forward recognition camera is unable to receive certain data from the brake actuator assembly (skid control ECU) for approximately 3 seconds or more.

        Both conditions are met:


        • 3 seconds or more elapse after turning the ignition switch to ON.

        • The forward recognition camera power supply voltage is 10 V or higher

        		 Turn the ignition switch to ON and wait at least approximately 6 seconds. Warning message is displayed on the multi-information display. The DTC remains stored until it is cleared using the GTS.

    14. MILLIMETER WAVE RADAR SENSOR ASSEMBLY / GTS Display "Pre-Collision 2"

      Tech Tips

      DTC communication uses the CAN communication system.


      Body Electrical > Pre-Collision 2 > Trouble Codes
      DTC No. Detection Item DTC Detection Condition DTC Detection Precondition DTC Check Procedure Warning Indication in Meter DTC Storage Method
      U0100 Lost Communication with ECM/PCM "A" The millimeter wave radar sensor is unable to receive certain data from the ECM for approximately 4 seconds or more.

      Both conditions are met:


      • 3 seconds or more elapse after turning the ignition switch to ON.

      • The millimeter wave radar sensor power supply voltage is 10 V or higher

      		 Turn the ignition switch to ON and wait at least approximately 7 seconds. Warning message is displayed on the multi-information display. The DTC is stored only while the malfunction is present.
      U0125 Lost Communication with Yaw Rate Sensor Module The millimeter wave radar sensor is unable to receive certain data from the airbag sensor assembly for approximately 1 second or more.

      Both conditions are met:


      • 3 seconds or more elapse after turning the ignition switch to ON.

      • The millimeter wave radar sensor power supply voltage is 10 V or higher

      		 Turn the ignition switch to ON and wait at least approximately 4 seconds. Warning message is displayed on the multi-information display. The DTC is stored only while the malfunction is present.
      U0126 Lost Communication with Steering Angle Sensor Module The millimeter wave radar sensor is unable to receive certain data from the spiral with sensor cable sub-assembly (steering angle sensor) for approximately 1 second or more.

      Both conditions are met:


      • 3 seconds or more elapse after turning the ignition switch to ON.

      • The millimeter wave radar sensor power supply voltage is 10 V or higher

      		 Turn the ignition switch to ON and wait at least approximately 4 seconds. Warning message is displayed on the multi-information display. The DTC is stored only while the malfunction is present.
      U0129 Lost Communication with Brake System Control Module The millimeter wave radar sensor is unable to receive certain data from the brake actuator assembly (skid control ECU) for approximately 4 seconds or more.

      Both conditions are met:


      • 3 seconds or more elapse after turning the ignition switch to ON.

      • The millimeter wave radar sensor power supply voltage is 10 V or higher

      		 Turn the ignition switch to ON and wait at least approximately 7 seconds. Warning message is displayed on the multi-information display. The DTC is stored only while the malfunction is present.
      U0235* Lost Communication with Cruise Control Front Distance Range Sensor The millimeter wave radar sensor is unable to receive certain data from the brake actuator assembly (skid control ECU) for approximately 2 seconds or more.

      Both conditions are met:


      • 2 seconds or more elapse after turning the ignition switch to ON.

      • The millimeter wave radar sensor power supply voltage is 10 V or higher

      		 Turn the ignition switch to ON and wait at least approximately 4 seconds. Warning message is displayed on the multi-information display. The DTC is stored only while the malfunction is present.
      U023A* Lost Communication with Image Processing Module "A" The millimeter wave radar sensor is unable to receive certain data from the forward recognition camera for approximately 1 second or more.

      Both conditions are met:


      • 3 seconds or more elapse after turning the ignition switch to ON.

      • The millimeter wave radar sensor power supply voltage is 10 V or higher

      		 Turn the ignition switch to ON and wait at least approximately 4 seconds. Warning message is displayed on the multi-information display. The DTC is stored only while the malfunction is present.
      U1002* Lost Communication with Gateway Module The millimeter wave radar sensor is unable to receive certain data from the forward recognition camera for approximately 1 second or more.

      Both conditions are met:


      • Approximately 3 seconds or more elapse after turning the ignition switch to ON.

      • The millimeter wave radar sensor power supply voltage is 10 V or higher

      		 Turn the ignition switch to ON and wait at least approximately 4 seconds. Warning message is displayed on the multi-information display. The DTC is stored only while the malfunction is present.

      *: Refer to the Pre-collision System.

      Click here

    15. AIRBAG SENSOR ASSEMBLY

      Tech Tips

      The airbag sensor assembly is connected to the CAN communication system but CAN communication DTCs are not stored.

    16. SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY (STEERING ANGLE SENSOR)

      Tech Tips

      The spiral with sensor cable sub-assembly (steering angle sensor) is connected to the CAN communication system but CAN communication DTCs are not stored.

    17. Regarding the past communication error of ECUs and sensors connected to the V bus (in this case, normal was displayed when performing the CAN bus check, but communication DTCs are output), the probable CAN branch that had a malfunction can be determined based on the following DTC combination table.

  5. CAN BUS WAVEFORMS

    B00267BE03

    Tech Tips


    • This waveform is measured between terminals CANH and GND, and terminals CANL and GND of the DLC3. (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 wire, an open in a CAN branch wire, or a short between a CAN wire (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. B0026YFN04
        *a 1 V/DIV.
        *b 50 μs/DIV.

        Normal waveform

      2. B00253UN03
        *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 output 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. B0024B5N03
        *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. B0024D2N03
        *a 1 V/DIV.
        *b 50 μs/DIV.

        Open in a CAN branch wire (CANH)

        Tech Tips


        • An abnormal waveform is output from an ECU with an open in one of its CAN branch wires. 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 wire is disconnected.

      2. B0024V9N03
        *a 1 V/DIV.
        *b 50 μs/DIV.

        Open in a CAN branch wire (CANL)

        Tech Tips


        • An abnormal waveform is output from an ECU with an open in one of its CAN branch wires. 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 wire is disconnected.

      3. B00291QN03
        *a 1 V/DIV.
        *b 50 μs/DIV.

        Open in a CAN main wire (CANH)

        Tech Tips


        • Waveforms of ECUs or sensors that are closer to the DLC3 than the open part are almost normal.

        • Waveforms of ECUs or sensors that are on the opposite side of the DLC3 from the open part are abnormal.

        • An open in a CAN main wire can be confirmed by measuring the resistance between the CANH and CANL terminals of any CAN branch.

      4. B0024WLN03
        *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 connector(s) from the CAN junction connector(s) 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. B0028W2N03
        *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 connector(s) from the CAN junction connector(s) 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 from

      (Can be Checked in Data List)

      Data Received

      (Cannot be Checked in Data List)

      		 Selected System*2

      Relevant Data List Item

      [Selected System]
      Engine speed ECM

      • Brake actuator assembly (skid control ECU)

      • Combination meter assembly

      • Engine stop and start ECU

      • Air conditioning amplifier assembly

      • 4 wheel drive control ECU

      • Certification ECU (smart key ECU assembly)

      • Airbag sensor assembly

      • Headlight leveling ECU assembly

      • Navigation receiver assembly

      • Radio and display receiver assembly

      		 Engine Engine Speed
      ABS/VSC/TRC Engine Revolutions
      Combination Meter Engine Rpm
      Stop and Start Engine Spd (ECM)
      Engine coolant temperature ECM

      • Air conditioning amplifier assembly

      • Combination meter assembly

      • Engine stop and start ECU

      • Brake actuator assembly (skid control ECU)

      • Certification ECU (smart key ECU assembly)

      		 Engine Coolant Temp
      Combination Meter Coolant Temperature
      Air Conditioner Engine Coolant Temp
      Stop and Start Coolant Temp
      Stop light switch Brake actuator assembly (skid control ECU)

      • Certification ECU (smart key ECU assembly)

      • Engine stop and start ECU

      		 Airbag sensor assembly ABS/VSC/TRC Stop Light SW
      Power Source Control Stop Light Switch1
      Stop and Start Stop Light SW (ECM)
      Wheel speed signal Brake actuator assembly (skid control ECU) 4 wheel drive control ECU

      • ECM

      • Headlight leveling ECU assembly

      • Engine stop and start ECU

      		 ABS/VSC/TRC

      • FR Wheel Speed

      • FL Wheel Speed

      • RR Wheel Speed

      • RL Wheel Speed
      Four Wheel Drive

      • FR Wheel Speed

      • FL Wheel Speed

      • RR Wheel Speed

      • RL Wheel Speed
      Steering angle signal Spiral with sensor cable sub-assembly (steering angle sensor)

      • Brake actuator assembly (skid control ECU)

      • Engine stop and start ECU

      • Airbag sensor assembly

      • Navigation receiver assembly

      • Radio and display receiver assembly

      		 ABS/VSC/TRC Steering Angle Sensor
      Stop and Start Steering Angle
      Vehicle speed Brake actuator assembly (skid control ECU)

      • ECM

      • Combination meter assembly

      • 4 wheel drive control ECU

      • Navigation receiver assembly

      • Radio and display receiver assembly

      • Engine stop and start ECU

      		 Airbag sensor assembly ABS/VSC/TRC Vehicle Speed
      Engine Vehicle Speed
      Combination Meter Vehicle Speed Meter
      Four Wheel Drive Vehicle Speed
      Navigation System Vehicle Speed
      Stop and Start Vehicle Spd1 (ABS/VSC)
      Combination meter assembly*1 -

      • Air conditioning amplifier assembly

      • Certification ECU (smart key ECU assembly)

      • Airbag sensor assembly

      		 Combination Meter Vehicle Speed Meter
      Ambient temperature Combination meter assembly Air conditioning amplifier assembly - Combination Meter Ambient Temperature
      Air Conditioner Ambient Temp Sensor
      Door courtesy Combination meter assembly -

      • Certification ECU (smart key ECU assembly)

      • Engine stop and start ECU

      		 Combination Meter

      • Driver Side Door

      • Passenger Side Door

      • Rear Left Side Door

      • Rear Right Side Door

      • *1: The combination meter assembly receives a vehicle speed signal from the brake actuator assembly (skid control ECU) and sends the signal to other ECUs.

      • *2: According to the display on the GTS, read the Data List.


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

          ECD SYSTEM (w/ DPF):

          Click here

          ECD SYSTEM (w/ Urea SCR System):

          Click here

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

          Click here

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

          Click here

        • Enter the following menus: Powertrain / Stop and Start / Data List

          Click here

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

          for Automatic Air Conditioning System:

          Click here

          for Manual Air Conditioning System:

          Click here

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

          Click here

        • Enter the following menus: Powertrain / Four Wheel Drive / Data List

          Click here

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

          w/ Navigation System:

          Click here

          w/ Audio and Visual System (for Radio and Display Type):

          Click here