LIGHTING SYSTEM, Diagnostic DTC:B124B

DTC Code DTC Name
B124B Automatic High Beam System

DESCRIPTION

This DTC is stored when the main body ECU detects malfunctions in the automatic high beam system.

DTC Code DTC Detection Condition Trouble Area
B124B Malfunction in automatic high beam system

  • CAN communication system

  • Inner rear view mirror assembly (automatic high beam sensor)

WIRING DIAGRAM

A000XH5E06
*a Inner Rear View Mirror Assembly (Automatic High Beam Sensor)
*b Main Body ECU
*c LIN Communication Line
*d CAN Communication Line

CAUTION / NOTICE / HINT

Note

First perform the communication function inspections in How to Proceed with Troubleshooting to confirm that there are no CAN communication malfunctions before troubleshooting this symptom.

PROCEDURE


  1. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      OK
      DTC B124B is not output.

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

  2. CHECK FOR DTC


    1. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC B2414 is output A
      DTC B2415 is output B
      CAN communication system DTC is output (for LHD) C
      CAN communication system DTC is output (for RHD) D
      Other DTC is not output E

    A

    GO TO DTC B2414 Click here

    B

    GO TO DTC B2415 Click here

    C

    GO TO CAN COMMUNICATION SYSTEM (for LHD) Click here

    D

    GO TO CAN COMMUNICATION SYSTEM (for RHD) Click here

    E

    REPLACE INNER REAR VIEW MIRROR ASSEMBLY Click here