VEHICLE STABILITY CONTROL SYSTEM Brake Warning Light does not Come ON

DTC Code DTC Name
Brake Warning Light does not Come ON

DESCRIPTION

The skid control ECU (brake actuator assembly) is connected to the combination assembly meter via CAN communication.

WIRING DIAGRAM

Refer to Brake Warning Light Remains ON.

Click here

CAUTION / NOTICE / HINT

Note:

When replacing the skid control ECU (brake actuator assembly), perform zero point calibration.

Click here

PROCEDURE

  1. CHECK CAN COMMUNICATION SYSTEM

    1. Check if CAN communication system DTCs are output.

      for LHD:Click hereClick hereClick here

      for RHD:Click hereClick hereClick here

      Result

      Proceed to

      DTC is not output

      DTC is output (for LHD)

      DTC is output (for RHD)
    DTC is output (for LHD)

    CHECK CAN COMMUNICATION SYSTEM

    Click here

    DTC is output (for RHD)

    CHECK CAN COMMUNICATION SYSTEM

    Click here

    DTC is not output

  2. CHECK BRAKE WARNING LIGHT

    1. Disconnect the A64 skid control ECU (brake actuator assembly) connector.

    2. Turn the ignition switch to ON.

    3. Check that the brake warning light comes on.

    OK

    The brake warning light comes on.

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE BRAKE ACTUATOR ASSEMBLY

    Click here

    NG

  3. PERFORM ACTIVE TEST USING GTS (BRAKE WARNING LIGHT)

    1. Turn the ignition switch off.

    2. Reconnect the A64 skid control ECU (brake actuator assembly) connector.

    3. Connect the GTS to the DLC3.

    4. Turn the ignition switch to ON.

    5. Turn the GTS on.

    6. Enter the following menus: Chassis / ABS/VSC/TRC / Data List.

    7. According to the display on the GTS, perform the Active Test.

    8. When performing the Brake Warning Light Active Test, check Brake Warning Light in the Data List.

    Chassis > ABS/VSC/TRC > Active Test

    Tester Display

    Measurement Item

    Control Range

    Diagnostic Note

    Brake Warning Light

    Brake warning light

    Warning light OFF/ON

    Observe combination meter

    Vehicle condition: Vehicle stopped

    Chassis > ABS/VSC/TRC > Data List

    Tester Display

    Measurement Item

    Range

    Normal Condition

    Diagnostic Note

    Brake Warning Light

    Brake warning light

    OFF or ON

    OFF: Warning light off

    ON: Warning light on

    -

    Chassis > ABS/VSC/TRC > Active Test

    Active Test Display

    Brake Warning Light

    Data List Display

    Brake Warning Light

    Result

    Result

    Proceed to

    Brake warning light in the Data List does not change using the Active Test

    A

    Brake warning light in the Data List turns ON/OFF using the Active Test

    B
    A

    REPLACE BRAKE ACTUATOR ASSEMBLY

    Click here

    B

  4. INSPECT COMBINATION METER ASSEMBLY

    1. Turn the ignition switch off.

    2. Perform Active Test of the combination meter assembly using the GTS.

      Body Electrical > Combination Meter > Active Test

      Tester Display

      Indicat. Lamp Brake

    3. Check the combination meter assembly.

    OK

    The brake warning light turns on or off in accordance with the GTS.

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE BRAKE ACTUATOR ASSEMBLY

    Click here

    NG

    INSPECT METER / GAUGE SYSTEM

    Click here