AUTOMATIC HIGH BEAM SYSTEM, Diagnostic DTC:B124B

DTC Code DTC Name
B124B Automatic High Beam System

DESCRIPTION

The main body ECU (multiplex network body ECU) determines the status of the automatic high beam system based on the automatic high beam system signal from the inner rear view mirror assembly.

DTC No. Detection Item DTC Detection Condition Trouble Area
B124B Automatic High Beam System Malfunction in automatic high beam system

  • CAN communication system

  • Inner rear view mirror assembly

  • Main body ECU (multiplex network body ECU)

WIRING DIAGRAM

B006KZ0E01
*1 Inner Rear View Mirror Assembly
*2 Main Body ECU (Multiplex Network Body ECU)
*3 CAN Communication Line

CAUTION / NOTICE / HINT

Note


  • Confirm that there are no CAN communication system malfunctions before performing the following inspection.

    Click here

  • If the main body ECU (multiplex network body ECU) is replaced, refer to Service Bulletin.

PROCEDURE


  1. CHECK FOR DTC (AUTOMATIC HIGH BEAM SYSTEM)


    1. Clear the DTCs.

      Click here


      Body Electrical > Main Body > Clear DTCs

    2. Check for DTCs.

      Click here


      Body Electrical > Main Body > Trouble Codes
      Result
      Result Proceed to
      DTC B124B is not output A
      DTC B124B is output B

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

  2. CHECK FOR DTC


    1. Check for DTCs.

      Click here


      Body Electrical > Main Body > Trouble Codes
      Body Electrical > HL AutoLeveling > Trouble Codes
      Body Electrical > Automatic High Beam > Trouble Codes
      Result
      Result Proceed to
      DTC B2461 is output A
      DTC B2415 is output B
      DTC U0101 is output C
      DTCs B2461, B2415 and U0101 are not output D

    A

    GO TO DTC B2461 Click here

    B

    GO TO DTC B2415 Click here

    C

    GO TO DTC U0101 Click here

    D

  3. CHECK INNER REAR VIEW MIRROR ASSEMBLY


    1. Replace the inner rear view mirror assembly with a new one.

      Click here

    2. Clear the DTCs.

      Click here


      Body Electrical > Main Body > Clear DTCs

    3. Check for DTCs.

      Click here


      Body Electrical > Main Body > Trouble Codes
      Result
      Result Proceed to
      DTC B124B is not output A
      DTC B124B is output B

    A

    END (INNER REAR VIEW MIRROR ASSEMBLY WAS DEFECTIVE)

    B

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here