VEHICLE STABILITY CONTROL SYSTEM 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 here

      for RHD: Click 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.


      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

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


      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