LIGHTING SYSTEM(for LED Headlight), Diagnostic DTC:B124B

DTC Code DTC Name
B124B Automatic High Beam System

DESCRIPTION

The main body ECU (multiplex network body ECU) determines the status of the automatic high beam system based on the automatic high beam system signal from the forward recognition camera.

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

  • Forward recognition camera system

  • Pre-collision system

  • SFI system

  • Vehicle stability control system (for Hydraulic Brake Booster)

  • Vehicle stability control system (for Vacuum Brake Booster)

  • CAN communication system

  • Forward recognition camera

  • Main body ECU (multiplex network body ECU)

 Main body ECU (multiplex network body ECU) w/ Automatic High Beam System

WIRING DIAGRAM

B001CVBE65
*1 Forward Recognition Camera
*2 Main Body ECU (Multiplex Network Body ECU)
*3 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

  • Before replacing the main body ECU (multiplex network body ECU), refer to Service Bulletin.

Tech Tips


    If the forward recognition camera stores a DTC for a malfunction of any of the following, this DTC will be stored simultaneously.

  • Speed sensor malfunction

  • Yaw rate sensor malfunction

  • Steering sensor malfunction

  • CAN communication system

PROCEDURE


  1. CHECK FOR DTC (HEALTH CHECK)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

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

    5. 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 OTHER DTC CHART

    A

  2. CHECK FORWARD RECOGNITION CAMERA


    1. Check if a dynamic radar cruise control system, lane departure alert system, road sign assist system and pre-collision system warning message are displayed on the combination meter assembly.

      Click here

      OK
      No dynamic radar cruise control system, road sign assist system, lane departure alert system and pre-collision system warning messages are displayed.
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

    NG

    GO TO FORWARD RECOGNITION CAMERA SYSTEM Click here