LIGHTING SYSTEM, Diagnostic DTC:B124B

DTC Code DTC Name
B124B Automatic High Beam System

DESCRIPTION

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

DTC No. DTC Detection Condition Trouble Area
B124B Malfunction in automatic high beam system

  • Steering angle sensor

  • VSC system

  • CAN communication system

  • Inner rear view mirror assembly

  • AFS ECU (headlight swivel ECU assembly)

WIRING DIAGRAM

A01CFJWE02

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      OK
      DTC B124B is not output.

    NG

    CHECK FOR DTC Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here

  2. CHECK FOR DTC


    1. Check for DTCs Click here.

      Result
      Result Proceed to
      Other DTC is not output A
      DTC B2414 is output B
      DTC B2415 is output C
      DTC B2427 is output D

    B

    GO TO DTC (B2414) Click here

    C

    GO TO DTC (B2415) Click here

    D

    GO TO DTC (B2427) Click here

    A

  3. CHECK INNER REAR VIEW MIRROR ASSEMBLY


    1. Replace the inner rear view mirror assembly with a new or normally functioning one Click here.

    2. Check for DTCs Click here.

      OK
      DTC B124B is not output.

    NG

    REPLACE AFS ECU (HEADLIGHT SWIVEL ECU ASSEMBLY) Click here

    OK

    END (INNER REAR VIEW MIRROR ASSEMBLY WAS DEFECTIVE)