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

  • Pre-collision system

  • SFI system

  • Vehicle stability control system

  • CAN communication system

  • Forward recognition camera

  • Main body ECU (multiplex network body ECU)

WIRING DIAGRAM

B005963E65
*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

Click here

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 engine 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 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 (w/ Steering Control) and pre-collision system warning message are displayed on the combination meter assembly.

      Click here

      OK
      No dynamic radar cruise control system, lane departure alert system (w/ Steering Control) 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