BLIND SPOT MONITOR SYSTEM, Diagnostic DTC:U1331

DTC Code DTC Name
U1331 Software Incompatibility with Body Control Module "B"

DESCRIPTION

This DTC is stored when the destination information of the main body ECU (multiplex network body ECU) does not match that of the blind spot monitor sensors.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

U1331

Software Incompatibility with Body Control Module "B"

Destination information of the main body ECU (multiplex network body ECU) and blind spot monitor sensor do not match.

  • Main body ECU (multiplex network body ECU)

  • Blind spot monitor sensor LH

  • Blind spot monitor sensor RH

CAUTION / NOTICE / HINT

Note:

  • When checking for DTCs, make sure that the blind spot monitor main switch (warning cancel switch assembly*1 or telltale light assembly*2) is on.

    • *1: for LHD

    • *2: for RHD

  • When replacing the main body ECU (multiplex network body ECU), make sure to replace it with a new one.

PROCEDURE

  1. CONFIRM PART NUMBER (MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU])

    1. Check the main body ECU (multiplex network body ECU) part number.

      1. Check if the part number of the main body ECU (multiplex network body ECU) installed on the vehicle is correct.

        OK

        The part number is correct.

    Result

    Proceed to

    OK

    NG (for LHD)

    NG (for RHD)
    NG (for LHD)

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

    Click here

    NG (for RHD)

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

    Click here

    OK

  2. CHECK DTC

    1. Clear the DTCs.

      Click here

      Body Electrical > Blind Spot Monitor Master > Clear DTCs

      Body Electrical > Blind Spot Monitor Slave > Clear DTCs

    2. Recheck for DTCs and check if the same DTC is output again.

      Click here

      Body Electrical > Blind Spot Monitor Master > Trouble Codes

      Body Electrical > Blind Spot Monitor Slave > Trouble Codes

      Result

      Proceed to

      No DTC is output

      DTC is output from the blind spot monitor sensor LH (Master)

      DTC is output from the blind spot monitor sensor RH (Slave)
    No DTC is output

    USE SIMULATION METHOD TO CHECK

    Click hereClick hereClick hereClick here

    DTC is output from the blind spot monitor sensor LH (Master)

    REPLACE BLIND SPOT MONITOR SENSOR LH

    Click here

    DTC is output from the blind spot monitor sensor RH (Slave)

    REPLACE BLIND SPOT MONITOR SENSOR RH

    Click here