AUTOMATIC HIGH BEAM SYSTEM, Diagnostic DTC:B124B

DTC Code DTC Name
B124B Automatic High Beam System

DESCRIPTION

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

  • CAN communication system

  • Lane departure alert system

  • Lane departure warning camera

  • Main body ECU (multiplex network body ECU)

WIRING DIAGRAM

B0059XQE06
*1 Lane Departure Warning Camera
*2 Network Gateway ECU
*3 Main Body ECU (Multiplex Network Body ECU)
*4 CAN Communication Line

CAUTION / NOTICE / HINT

Note


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

    for LHD:

    Click here

    for RHD:

    Click here

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

    Click here

  • As the door control battery is installed between the vehicle battery and main body ECU (multiplex network body ECU), first perform the inspections in On-Vehicle Inspection to confirm that there are no malfunctions in the power source circuit for the main body ECU (multiplex network body ECU) before performing this troubleshooting procedure.*

    *: w/ Door Control Battery

  • When the lane departure warning camera is replaced with a new one, adjustment of the lane departure warning camera beam axis must be performed.

PROCEDURE


  1. CHECK FOR DTC (AUTOMATIC HIGH BEAM SYSTEM)


    1. Clear the DTCs.

      Click here


      Body Electrical > Main Body > Clear DTCs

    2. Check for DTCs.

      Click here


      Body Electrical > Main Body > Trouble Codes
      Result
      Result Proceed to
      DTC B124B is not output A
      DTC B124B is output B

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

  2. CHECK FOR DTC (LANE DEPARTURE ALERT SYSTEM)


    1. Check for DTCs.

      w/o Steering Control:

      Click here

      w/ Steering Control:

      Click here


      Chassis > Lane Departure Alert > Trouble Codes
      Result
      Result Proceed to
      Lane departure alert system DTCs are not output A
      Lane departure alert system DTCs are output B
      Lane departure alert system DTCs are output (w/ Steering Control) C
      CAN communication system DTCs are output (for LHD) D
      CAN communication system DTCs are output (for RHD) E

    B

    GO TO LANE DEPARTURE ALERT SYSTEM Click here

    C

    GO TO LANE DEPARTURE ALERT SYSTEM Click here

    D

    GO TO CAN COMMUNICATION SYSTEM Click here

    E

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  3. CHECK LANE DEPARTURE WARNING CAMERA


    1. Replace the lane departure warning camera with a new one.

      Click here

    2. Check for DTCs.

      Click here


      Body Electrical > Main Body > Trouble Codes
      Result
      Result Proceed to
      DTC B124B is not output A
      DTC B124B is output B

    A

    END (LANE DEPARTURE WARNING CAMERA WAS DEFECTIVE)

    B

    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