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

  • Electronically controlled brake system

  • CAN communication system

  • Pre-crash safety city sensor

  • Main body ECU (multiplex network body ECU)

WIRING DIAGRAM

E303800E32

CAUTION / NOTICE / HINT

Note:

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

    Click here

  • If the pre-crash safety city sensor has been replaced, or the windshield glass has been replaced or removed/installed, be sure to perform Recognition Camera/Target Position Memory and Recognition Camera Axis Adjust. If not performed, DTC will be stored when the system is turned on.

    Click here

  • When replacing the pre-crash safety city sensor, replace it with a new one. If a pre-crash safety city sensor which was installed to another vehicle is used, the information stored in the pre-crash safety city sensor will not match the information from the vehicle and, as a result, a DTC may be stored.

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.

  • Speed sensor malfunction

  • Yaw rate sensor malfunction

  • Steering angle sensor malfunction

  • Lost communication with Main body ECU (multiplex network body ECU)

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. INSPECT 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

    REPLACE PRE-CRASH SAFETY CITY SENSOR

    Click here