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 malfunctions 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)

  • Lane departure warning camera

  • Main body ECU (multiplex network body ECU)

WIRING DIAGRAM

E270527E01

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 DTC.

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

    Click hereClick here

  • When replacing the main body ECU (multiplex network body ECU), make sure to replace it with a new one.

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

    Proceed to

    DTC B124C is not output

    DTC B124C is output
    DTC B124C is not output

    USE SIMULATION METHOD TO CHECK

    Click hereClick hereClick hereClick here

    DTC B124C is output

  2. CHECK FOR DTC (LANE DEPARTURE ALERT SYSTEM)

    1. Clear the DTCs.

      Click here

      Chassis > Lane Departure Alert > Clear DTCs

    2. Check for DTCs.

      Click here

      Chassis > Lane Departure Alert > Trouble Codes

    Result

    Proceed to

    Lane departure alert system DTCs are not output

    Lane departure alert system DTCs are output
    Lane departure alert system DTCs are output

    GO TO LANE DEPARTURE ALERT SYSTEM

    Click here

    Lane departure alert system DTCs are not output

  3. CHECK LANE DEPARTURE WARNING CAMERA

    1. Temporarily replace the lane departure warning camera with a new or normally functioning one.

      Click hereClick here

    2. Check for DTCs.

      Click here

      Body Electrical > Main Body > Trouble Codes

    Result

    Proceed to

    DTC B124C is not output

    DTC B124C is output
    DTC B124C is not output

    END (LANE DEPARTURE WARNING CAMERA WAS DEFECTIVE)

    DTC B124C is output

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

    Click here