Diagnosis System

1. Select "CAN Bus Check" from "System Select".

1. Systems (ECUs and sensors) that use CAN communication vary depending on the optional settings of the vehicle. Check which systems (ECUs and sensors) are installed on the vehicle.

HINT:

• In the CAN communication system, CAN communication system DTCs stored by the ECU can be output by using the Techstream.
• 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".

1. MASTER CYLINDER SOLENOID (SKID CONTROL ECU)

   HINT:

   DTC communication uses the CAN communication system.

   DTC CODE CHART
   
   

   DTC Code	Detection Item
   U0073	Control Module Communication Bus OFF
   U0100	Lost Communication with ECM/PCM "A"
   U0114/38	Lost Communication with 4WD Control ECU
   U0123	Lost Communication with Yaw Rate Sensor Module
   U0124	Lost Communication with Lateral Acceleration Sensor Module
   U0126	Lost Communication with Steering Angle Sensor Module
   U0130	Lost Communication with Steering Effort Control Module

2. ECM/ECT

   HINT:

   DTC communication uses the CAN communication system.

   DTC CODE CHART
   
   

   DTC Code	Detection Item
   U0100	Lost Communication with ECM/PCM "A"
   U0101	Lost Communication with TCM
   U0122	Lost Communication with Distance Control Module
   U0123	Lost Communication with Yaw Rate Sensor Module
   U0126	Lost Communication with Steering Angle Sensor Module
   U0235	Lost Communication with Cruise Control Front Distance Range Sensor
   U1101	Lost Communication with Distance Control ECU
   U1102	Lost Communication with Radar Sensor

3. MAIN BODY ECU (COWL SIDE JUNCTION BLOCK LH)

   HINT:

   DTC communication uses the CAN communication system.

   DTC CODE CHART
   
   

   DTC Code	Detection Item
   U0127	Lost Communication with Tire Pressure Monitor Module
   U0141	Lost Communication with Body Control Module "A"
   U0148	Lost Communication with Gateway "C"
   U0199	Lost Communication with "Door Control Module A"
   U0208	Lost Communication with "Seat Control Module A"
   U0230	Lost Communication with Rear Gate Module
   U0327	Software Incompatibility with Vehicle Security Control Module
   U1002 (CAN MS BUS)	Lost Communication with Gateway Module (Main Body ECU)
   U1111	Lost Communication with Front Controller Module
   U1115	Lost Communication with Tilt and Telescopic Module

4. COMBINATION METER

   HINT:

   DTC communication uses the CAN communication system.

   DTC CODE CHART
   
   

   DTC Code	Detection Item
   U0100	Lost Communication with ECM/PCM "A"
   U0129	Lost Communication with Brake System Control Module

5. SEAT BELT CONTROL ECU

   For vehicles with the dynamic radar cruise control system only.

   HINT:

   DTC communication uses the CAN communication system.

   DTC CODE CHART
   
   

   DTC Code	Detection Item
   U0122	Lost Communication with Vehicle Dynamics Control Module
   U0151	Lost Communication with Airbag ECU
   U1101	Lost Communication with Distance Control ECU

6. MULTIPLEX TILT AND TELESCOPIC ECU

   HINT:

   DTC communication uses the CAN communication system.

   DTC CODE CHART
   
   

   DTC Code	Detection Item
   B2621	Communication Interruption
   B2624*	Vehicle Speed Malfunction
   HINT: *: Refer to the Power Tilt and Power Telescopic Steering Column System (See DIAGNOSTIC TROUBLE CODE CHART ).

7. DISPLAY AND NAVIGATION MODULE DISPLAY For vehicles with the navigation system only.

   HINT:

   The display and navigation module display is connected to the CAN communication system but CAN communication DTCs are not stored.

8. MULTI-DISPLAY

   For vehicles without the navigation system only.

   HINT:

   The multi-display is connected to the CAN communication system but CAN communication DTCs are not stored.

9. OUTER MIRROR CONTROL ECU

   HINT:

   The outer mirror control ECU is connected to the CAN communication system but CAN communication DTCs are not stored.

10. CENTER AIRBAG SENSOR

    HINT:

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

11. CERTIFICATION ECU (SMART KEY ECU)

    HINT:

    The certification ECU (smart key ECU) is connected to the CAN communication system but CAN communication DTCs are not stored.

12. AIR CONDITIONING AMPLIFIER

    HINT:

    DTC communication uses the CAN communication system.

    DTC CODE CHART
    
    

    DTC Code	Detection Item
    B1499	Multiplex Communication Circuit

13. POSITION CONTROL ECU AND SWITCH

    HINT:

    The position control ECU and switch is connected to the CAN communication system but CAN communication DTCs are not stored.

14. TIRE PRESSURE WARNING ECU

    HINT:

    DTC communication uses the CAN communication system.

    DTC CODE CHART
    
    

    DTC Code	Detection Item
    C2179	Multiplex Communication Circuit

15. NETWORK GATEWAY ECU

    HINT:

    DTC communication uses the CAN communication system.

    DTC CODE CHART
    
    

    DTC Code	Detection Item
    U0114/38	Lost Communication with 4WD Control ECU
    U0122	Lost Communication with Vehicle Dynamics Control Module
    U0123	Lost Communication with Yaw Rate Sensor Module
    U0126	Lost Communication with Steering Angle Sensor Module
    U0130	Lost Communication with Steering Effort Control Module
    U0132	Lost Communication with Ride Level Control Module
    U1002 (CAN No. 2 BUS)	Lost Communication with Gateway Module (Network Gateway ECU)
    U1100	Lost Communication with Seat Belt Control Module
    U1101	Lost Communication with Distance Control ECU
    U1126	Lost Communication with Parking Assist ECU

16. PARKING ASSIST ECU

    For vehicles with the wide view front and side monitor system only.

    HINT:

    The parking assist ECU is connected to the CAN communication system but CAN communication DTCs are not stored.

17. 4WD CONTROL ECU

    HINT:

    The 4WD control ECU is connected to the CAN communication system but CAN communication DTCs are not stored.

18. NO. 2 MAIN BODY ECU

    HINT:

    The No. 2 main body ECU is connected to the CAN communication system but CAN communication DTCs are not stored.

19. WINDSHIELD WIPER ECU

    HINT:

    The windshield wiper ECU is connected to the CAN communication system but CAN communication DTCs are not stored.

20. POWER BACK DOOR UNIT (POWER BACK DOOR ECU)

    For vehicles with the power back door system only.

    HINT:

    The power back door unit (power back door ECU) is connected to the CAN communication system but CAN communication DTCs are not stored.

21. SUSPENSION CONTROL ECU

    HINT:

    DTC communication use the CAN communication system.

    DTC CODE CHART
    
    

    DTC Code	Detection Item
    U0100	Lost Communication with ECM/PCM "A"
    U0101	Lost Communication with TCM
    U0114/38	Lost Communication with 4WD Control ECU
    U0122	Lost Communication with Vehicle Dynamics Control Module
    U0124	Lost Communication with Lateral Acceleration Sensor Module
    U0126	Lost Communication with Steering Angle Sensor Module
    U0130	Lost Communication with Steering Effort Control Module
    U0140	Lost Communication with Main Body ECU

22. DISTANCE CONTROL ECU

    For vehicles with the dynamic radar cruise control system only.

    HINT:

    The distance control ECU is connected to the CAN communication system but CAN communication DTCs are not stored.

23. AFS ECU (HEADLIGHT SWIVEL ECU)

    HINT:

    DTC communication uses the CAN communication system.

    DTC CODE CHART
    
    

    DTC Code	Detection Item
    B2427	CAN Communication Malfunction

24. STEERING CONTROL ECU

    HINT:

    DTC communication uses the CAN communication system.

    DTC CODE CHART
    
    

    DTC Code	Detection Item
    U0100	Lost Communication with ECM/PCM "A"
    U0122	Lost Communication with Vehicle Dynamics Control Module
    U0126	Lost Communication with Steering Angle Sensor Module

25. BUS BUFFER ECU

    For vehicles with the LEXUS link system only.

    HINT:

    The bus buffer ECU is connected to the CAN communication system but CAN communication DTCs are not stored.