AUTOMATIC HIGH BEAM SYSTEM, Diagnostic DTC:B124B

Info Added 2017-08-02

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. DTC Detection Condition Trouble Area
B124B Malfunction in automatic high beam system

  • Front recognition camera system

  • Dynamic radar cruise control system

  • Lane departure alert system

  • Pre-crash safety system

  • Hybrid control system

  • Electronically controlled brake system

  • CAN communication system

  • Forward recognition camera

  • Main body ECU (multiplex network body ECU)

WIRING DIAGRAM

B001VJZE96
*1 Forward Recognition Camera
*2 Main Body ECU (Multiplex Network Body ECU)
*3 CAN Communication Line

CAUTION / NOTICE / HINT

Note


  • Confirm that there are no CAN communication malfunctions before performing the following inspection Click here.

  • If the main body ECU (multiplex network body ECU) is replaced, 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.

  • Vehicle speed sensor

  • Yaw rate and acceleration sensor

  • Steering angle sensor

  • CAN communication system

PROCEDURE


  1. CHECK FOR DTC (HEALTH CHECK)


    1. Connect the Techstream to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the Techstream 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 FRONT RECOGNITION CAMERA SYSTEM


    1. Check if a dynamic radar cruise control system, lane departure alert system or pre-crash safety 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-crash safety system warning messages are displayed.

    OK

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

    NG

    GO TO FORWARD RECOGNITION CAMERA Click here