AUTOMATIC HIGH BEAM SYSTEM, 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
B124B Automatic High Beam System Malfunction in automatic high beam system

  • Forward recognition camera system

  • Dynamic radar cruise control system

  • Lane departure alert system

  • Pre-collision system

  • Hybrid control system

  • Electronically controlled brake system

  • CAN communication system

  • Forward recognition camera

  • Main body ECU (multiplex network body ECU)

WIRING DIAGRAM

B004EDPE65
*1 Forward Recognition Camera
*2 Main Body ECU (Multiplex Network Body ECU)
*3 CAN Communication Line

CAUTION / NOTICE / HINT

Note


  • The lighting system uses the CAN communication system. Inspect the communication functions by following How to Proceed with Troubleshooting. Troubleshoot the automatic high beam system after confirming that the communication systems are functioning properly.

    for Triple Beam Headlight: Click here

    for Single Beam Headlight: Click here

  • 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

  • Yaw rate sensor

  • Steering sensor

  • CAN communication system

PROCEDURE


  1. CHECK FOR DTC (HEALTH CHECK)


    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
      Only DTC B124B is output A
      DTC B124B and other DTCs are output B

    B

    GO TO OTHER DTC CHART

    A

  2. CHECK FORWARD RECOGNITION CAMERA SYSTEM


    1. Check if a dynamic radar cruise control system, lane departure alert system or pre-collision system warning message is displayed on the multi-information display.

      Click here

      OK
      No dynamic radar cruise control 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