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

  • Lane departure alert system

  • Lane departure warning camera

  • Main body ECU (multiplex network body ECU)

  • CAN communication system

  • Electronically controlled brake system

  • SFI system

WIRING DIAGRAM

A005E99E13
*1 Lane Departure Warning Camera
*2 Main Body ECU (Multiplex Network Body ECU)
*3 CAN Communication Line

CAUTION / NOTICE / HINT

Note

Confirm that the CAN communication system is not malfunctioning before performing the following inspection (See page ) (w/o Central Gateway ECU) Click here (w/ Central Gateway ECU).

PROCEDURE


  1. CHECK FOR DTC (AUTOMATIC HIGH BEAM SYSTEM)


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      OK
      DTC B124B is not output.

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

  2. CHECK FOR DTC (LANE DEPARTURE ALERT SYSTEM)


    1. Check for DTCs Click here.

      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 (w/o Central Gateway ECU) C
      CAN communication system DTCs are output (w/ Central Gateway ECU) D

    B

    GO TO LANE DEPARTURE ALERT SYSTEM Click here

    C

    GO TO CAN COMMUNICATION SYSTEM Click here

    D

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  3. INSPECT LANE DEPARTURE ALERT WARNING


    1. Check if a lane departure alert system warning message is displayed on the multi-information display.

      OK
      No lane departure alert system warning message are displayed.

    OK

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

    NG

    REPLACE LANE DEPARTURE WARNING CAMERA Click here