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 malfunction in the automatic high beam system.

When DTCs for the following systems are stored, this DTC is stored simultaneously.


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

  • Forward recognition camera system

  • CAN communication system

  • Main body ECU (multiplex network body ECU)

WIRING DIAGRAM


  1. A01QSJJE09
    *1 Main Body ECU (Multiplex Network Body ECU)
    *2 Forward Recognition Camera
    *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 Registration.

  • When replacing the forward recognition camera, always replace it with a new one. If a forward recognition camera which was installed to another vehicle is used, the information stored in the forward recognition camera will not match the information from the vehicle. As a result, a DTC may be stored.

  • If the forward recognition camera has been replaced with a new one, be sure to perform Recognition Camera/Target Position Memory and Recognition Camera Axis Adjust.

    Click here

PROCEDURE


  1. CHECK FOR DTC (ALL)


    1. Connect the Techstream to DLC3.

    2. Turn the ignition switch to ON.

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

    4. Check for DTCs.

      Result
      Result Proceed to
      Only DTC B124B is output A
      DTC B124B is output at the same time B

    B

    GO TO DIAGNOSTIC TROUBLE CODE CHART Click here

    A

  2. CHECK FORWARD RECOGNITION CAMERA SYSTEM


    1. Check that a forward recognition camera system.

      Click here

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) for LHD: REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here
    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) for RHD: REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

    NG

    GO TO FORWARD RECOGNITION CAMERA SYSTEM Click here