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)

INSPECTION PROCEDURE

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 DTC.

PROCEDURE


  1. CLEAR DTC


    1. Clear the DTCs Click here.


    NEXT

  2. CHECK FOR DTC


    1. Check for DTCs Click here.

      OK
      DTC B124B output does not occur.

    NG

    CHECK FOR DTC Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here

  3. CHECK FOR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: System Select / Health Check.

    5. Check for DTCs.

      Result
      Result Proceed to
      DTC B2414 or B2415 is output A
      DTC U0125, U0126, U0129 or U0101 is output (for LHD) B
      DTC U0125, U0126, U0129 or U0101 is output (for RHD) C
      DTC B124B is output D

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    C

    GO TO CAN COMMUNICATION SYSTEM Click here

    D

    REPLACE INNER REAR VIEW MIRROR ASSEMBLY (AUTOMATIC HIGH BEAM SENSOR) Click here

    A

    GO TO DIAGNOSTIC TROUBLE CODE CHART Click here