AUTOMATIC HIGH BEAM SYSTEM, Diagnostic DTC:B124C

DTC Code DTC Name
B124C Automatic High Beam Camera

DESCRIPTION

This DTC is stored when the main body ECU (multiplex network body ECU) detects a malfunction in the lane departure warning camera.

DTC No. Detection Item DTC Detection Condition Trouble Area
B124C Automatic High Beam Camera

Malfunction in lane departure warning camera (automatic high beam camera)

(Detected for 2 seconds or more)

  • Lane departure warning camera

  • Main body ECU (multiplex network body ECU)

WIRING DIAGRAM

A018KGLE12
*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.*


    • *: w/ Smart Entry and Start System

  • 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.*

    Click here


    • *: for LHD

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 B124C is not output A
      DTC B124C 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
      OK
      Lane departure alert system DTCs are not output.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO LANE DEPARTURE ALERT SYSTEM Click here

    OK

  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 B124C 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