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

(Detected for 2 seconds or more)

  • Lane departure alert system

  • CAN communication system

  • Lane departure warning camera

  • Main body ECU (multiplex network body ECU)

WIRING DIAGRAM

A01MTJLE07
*1 Lane Departure Warning Camera
*2 Main Body ECU (Multiplex Network Body ECU)
*3 Network Gateway ECU
*4 CAN Communication Line

CAUTION / NOTICE / HINT

Note


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

    Click here

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

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
      OK
      DTC B124B is not output.
      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.

      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
      CAN communication system DTCs are output C

    B

    GO TO LANE DEPARTURE ALERT SYSTEM Click here

    C

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  3. CHECK LANE DEPARTURE WARNING CAMERA


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

      Click here

    2. Check for DTCs.

      Click here


      Body Electrical > Main Body > Trouble Codes
      OK
      DTC B124B is not output.
      Result
      Proceed to
      OK
      NG

    OK

    END (LANE DEPARTURE WARNING CAMERA WAS DEFECTIVE)

    NG

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