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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 U0101: Lost Communication with TCM; DTC U0120: Lost Communication With Starter / Generator Control Module; DTC U0126: Lost Communication with Steering Angle Sensor Module; DTC U0129: Lost Communication with Brake System Control Module; DTC U0151: Lost Communication with Restraints Control Module; DTC U0155: Lost Communication with Instrument Panel Cluster (IPC) Control Module; DTC U0163: Lost Communication with Navigation Control Module; DTC U0164: Lost Communication with HVAC Control Module; DTC U0208: Lost Communication with "Seat Control Module A"; DTC U0230: Lost Communication with Rear Gate Module; DTC U023A: Lost Communication With Image Processing Module "A"; DTC U0293: Lost Communication With Hybrid Powertrain Control Module; DTC U0327: Software Incompatibility with Vehicle Security Control Module; DTC U1106: Lost Communication with Electric Parking Brake Module [11/2020 - 11/2021] >> Procedure

DTC U0101: Lost Communication with TCM; DTC U0120: Lost Communication With Starter / Generator Control Module; DTC U0126: Lost Communication with Steering Angle Sensor Module; DTC U0129: Lost Communication with Brake System Control Module; DTC U0151: Lost Communication with Restraints Control Module; DTC U0155: Lost Communication with Instrument Panel Cluster (IPC) Control Module; DTC U0163: Lost Communication with Navigation Control Module; DTC U0164: Lost Communication with HVAC Control Module; DTC U0208: Lost Communication with "Seat Control Module A"; DTC U0230: Lost Communication with Rear Gate Module; DTC U023A: Lost Communication With Image Processing Module "A"; DTC U0293: Lost Communication With Hybrid Powertrain Control Module; DTC U0327: Software Incompatibility with Vehicle Security Control Module; DTC U1106: Lost Communication with Electric Parking Brake Module [11/2020 - 11/2021]: Procedure

  1. CLEAR DTC 
    1. Clear the DTCs.

      Body Electrical > Main Body > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  2

  2. CHECK FOR DTC 
    1. Check for DTCs.

      Body Electrical > Main Body > 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 [11/2020 - 11/2021]