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DTC B1003: ECU Malfunction [12/2019 - 11/2023]: Procedure

  1. RECONFIRM DTC OUTPUT 

    Body Electrical > Central Gateway > Trouble Codes 

    Result

    Result Proceed to
    DTC B1003 is not output from the central gateway ECU (network gateway ECU) A
    DTC B1003 is output from the central gateway ECU (network gateway ECU) B

    Result: 

    A 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - ] 

    Result: 

    B 

    REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU). Refer to  REMOVAL [12/2019 - 11/2023] 

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