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Home >> Toyota >> 2017 >> Mirai >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Headlights >> Lighting System (Ext) - Diagnostic Codes & Circuit Tests >> Lighting System >> DTC U0073: Control Module Communication Bus OFF; DTC U0100: Lost Communication with EV ECU; 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 U0293: Lost Communication with Hybrid Vehicle Control System [06/2015 - ] >> Procedure
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DTC U0073: Control Module Communication Bus OFF; DTC U0100: Lost Communication with EV ECU; 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 U0293: Lost Communication with Hybrid Vehicle Control System [06/2015 - ]: Procedure

  1. CHECK FOR DTC 
    1. Turn the power switch on (IG).
    2. Turn on the headlights using the headlight dimmer switch.
    3. Check for DTCs.

      Refer to DTC CHECK / CLEAR [06/2015 - 11/2018] , or refer to DTC CHECK / CLEAR [11/2018 - ]

      Body Electrical > HL AutoLeveling > Trouble Codes 

      Result

      Result Proceed to
      DTCs U0073, U0100, U0101, U0126, U0129, U0142, U0155 and U0293 are not output. A
      DTCs U0073, U0100, U0101, U0126, U0129, U0142, U0155 or U0293 and output. B

    Result: 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [06/2015 - 11/2018]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2018 - ] 

    Result: 

    GO TO CAN COMMUNICATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [06/2015 - 11/2018]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2018 - ]