AUTOMATIC HIGH BEAM SYSTEM, Diagnostic DTC:B124B

DTC Code DTC Name
B124B Automatic High Beam System

DESCRIPTION

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

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

  • Brake control system

  • Airbag sensor assembly (yaw rate and acceleration sensor)

  • CAN communication system

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

  • AFS ECU (headlight swivel ECU assembly)

WIRING DIAGRAM

A01D5FUE02

CAUTION / NOTICE / HINT

Note


  • First perform the communication function inspections in Diagnosis System to confirm that there are no CAN communication malfunctions before performing the following inspection.

    Click here

  • Inspect the inner rear view mirror assembly before performing the following procedure.

    Click here

  • If the AFS ECU (headlight swivel ECU assembly) has been replaced, it is necessary to synchronize the vehicle information and initialize the AFS ECU (headlight swivel ECU assembly).

    Click here

PROCEDURE


  1. CHECK FOR DTC


    1. Clear the DTCs.

      Click here


      Body Electrical > Main Body > Clear DTCs

    2. Check for DTCs.

      Click here


      Body Electrical > Main Body > Trouble Codes
      OK
      DTC B124B is not output.
      Result
      Proceed to
      OK
      NG

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

  2. CHECK FOR DTC


    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
      Only DTC B124B is output A
      DTC B2414 or B2415 is output B
      CAN communication system DTCs are output C

    B

    GO TO DIAGNOSTIC TROUBLE CODE CHART (AFS (ADAPTIVE FRONT-LIGHTING SYSTEM)) Click here

    C

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  3. CHECK INNER REAR VIEW MIRROR ASSEMBLY


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

      Click here

    2. Check for DTCs.

      Click here


      Body Electrical > Main Body > Trouble Codes
      OK
      DTC B124B is not output.
      Result
      Proceed to
      OK
      NG

    OK

    END (INNER REAR VIEW MIRROR ASSEMBLY (AUTOMATIC HIGH BEAM SENSOR) WAS DEFECTIVE)

    NG

    REPLACE AFS ECU (HEADLIGHT SWIVEL ECU ASSEMBLY) Click here