ELECTRONICALLY CONTROLLED BRAKE 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 booster with master cylinder assembly) is connected to the combination meter assembly via CAN communication.

CAUTION / NOTICE / HINT

Note:

When replacing the skid control ECU (brake booster with master cylinder assembly), perform initialization and calibration of the linear solenoid valve.

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

    Result

    Proceed to

    DTCs are not output.

    A

    DTCs are output.

    B
    B

    INSPECT CAN COMMUNICATION SYSTEM

    for LHD:Click here

    for RHD:Click here

    A

  2. PERFORM ACTIVE TEST USING GTS (BRAKE WARNING LIGHT / RED (MALFUNCTION))

    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Select the Active Test on the GTS.

      Click here

      Chassis > ABS/VSC/TRC > Active Test

      Tester Display

      Measurement Item

      Control Range

      Diagnostic Note

      Brake Warning Light

      Brake warning light / red (malfunction)

      Warning light ON/OFF

      Observe combination meter assembly

    4. Select the Data List on the GTS.

      Click here

      Chassis > ABS/VSC/TRC > Data List

      Tester Display

      Measurement Item

      Range

      Normal Condition

      Diagnostic Note

      Brake Warning Light

      Brake warning light / red (malfunction)

      ON or OFF

      ON: Warning light on

      OFF: Warning light off

      -

      Chassis > ABS/VSC/TRC > Active Test

      Active Test Display

      Brake Warning Light

      Data List Display

      Brake Warning Light

    5. Check the operating condition of the brake warning light / red (malfunction) when operating it using the GTS.

      Result

      Result

      Proceed to

      Brake warning light / red (malfunction) in the Data List does not change using the Active Test.

      A

      Brake warning light / red (malfunction) in the Data List turns ON/OFF using the Active Test.

      B
    A

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY

    for LHD:Click here

    for RHD:Click here

    B

  3. INSPECT COMBINATION METER ASSEMBLY

    1. Turn the power switch off.

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

      Click here

      Body Electrical > Combination Meter > Active Test

      Tester Display

      Indicat. Lamp Brake

    3. Check the combination meter assembly.

      OK

      The brake warning light / red (malfunction) turns on or off in accordance with the GTS operation.

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY

    for LHD:Click here

    for RHD:Click here

    NG

    INSPECT METER / GAUGE SYSTEM

    Click here