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Home >> Toyota >> 2021 >> Mirai XLE >> Repair and Diagnosis >> Accessories & Equipment >> Exterior Lights >> Lighting System (W/ Headlight Ecu) - Diagnostic Codes (2 Of 2) & Circuit Tests >> LIGHTING SYSTEM (w/ Headlight ECU) >> DTC U0073: Control Module Communication Bus Off; DTC U0101: Lost Communication with TCM; DTC U0126: Lost Communication with Steering Angle Sensor Module; DTC U0129: Lost Communication with Brake System Control Module; DTC U0142: Lost Communication with Body Control Module "B"; DTC U0155: Lost Communication with Instrument Panel Cluster (IPC) Control Module; DTC U0242: Lost Communication With Headlamp Control Module "B"; DTC U0293: Lost Communication with Hybrid Vehicle Control System [11/2021 - 12/2023] >> Procedure

DTC U0073: Control Module Communication Bus Off; DTC U0101: Lost Communication with TCM; DTC U0126: Lost Communication with Steering Angle Sensor Module; DTC U0129: Lost Communication with Brake System Control Module; DTC U0142: Lost Communication with Body Control Module "B"; DTC U0155: Lost Communication with Instrument Panel Cluster (IPC) Control Module; DTC U0242: Lost Communication With Headlamp Control Module "B"; DTC U0293: Lost Communication with Hybrid Vehicle Control System [11/2021 - 12/2023]: Procedure

  1. CLEAR DTC 
    1. Clear the DTCs.

      for Mono Camera Type:

      Body Electrical > HL AutoLeveling > Clear DTCs 

      for Stereo Camera Type:

      Body Electrical > AFS > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  2

  2. CHECK FOR DTC 
    1. Check for DTCs.

      for Mono Camera Type:

      Body Electrical > HL AutoLeveling > Trouble Codes 

      for Stereo Camera Type:

      Body Electrical > AFS > Trouble Codes 

      Result

      Result Proceed to
      DTCs are not output A
      DTCs are output B

    Result: 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2020 - ] 

    Result: 

    GO TO CAN COMMUNICATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2021 - 12/2022]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2022 - 12/2023]