AUTOMATIC HIGH BEAM SYSTEM, Diagnostic DTC:B124B

DTC Code DTC Name
B124B Automatic High Beam System

DESCRIPTION

This DTC is stored when the main body ECU (multiplex network body ECU) detects malfunctions in the automatic high beam system.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B124B

Automatic High Beam System

Malfunction in automatic high beam system

  • Pre-crash safety system

  • Lane departure alert system

  • SFI system

  • Vehicle stability control system

  • CAN communication system

  • Pre-crash safety city sensor

  • Main body ECU (multiplex network body ECU)

WIRING DIAGRAM

E303800E32

CAUTION / NOTICE / HINT

Note:

The automatic high beam system uses the CAN communication system. Inspect the communication functions by following How to Proceed with Troubleshooting. Troubleshoot the automatic high beam system after confirming that the communication systems are functioning properly.

Click here

Tip:

  • If the pre-crash safety city sensor stores a DTC for a malfunction of any of the following, this DTC will be stored simultaneously.

  • Vehicle speed sensor

  • Yaw rate sensor

  • Steering sensor

  • CAN communication system

PROCEDURE

  1. CHECK FOR DTC (HEALTH CHECK)

    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: System Select / Health Check.

    5. Check for DTCs.

    Result

    Result

    Proceed to

    Only DTC B124B is output

    A

    DTC B124B and other DTCs are output

    B
    B

    GO TO OTHER DTC CHART

    A

  2. CHECK PRE-CRASH SAFETY SYSTEM

    1. Check if a pre-crash safety system warning message is displayed on the combination meter assembly.

      OK

      No pre-crash safety system warning messages are displayed.

      Result

      Proceed to

      OK

      NG
    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

    for LHD:Click here

    for RHD:Click here

    NG

    GO TO PRE-CRASH SAFETY SYSTEM

    Click here