ELECTRONICALLY CONTROLLED BRAKE SYSTEM Brake Control 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.


      Result
      Result Proceed to
      DTCs are not output. A
      DTCs are output (for RHD). B
      DTCs are output (for LHD). C

    B

    INSPECT CAN COMMUNICATION SYSTEM Click here

    C

    INSPECT CAN COMMUNICATION SYSTEM Click here

    A

  2. PERFORM ACTIVE TEST USING GTS (BRAKE WARNING LIGHT / YELLOW (MINOR 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
      ECB Warning Light Brake warning light / yellow (minor malfunction) Warning light ON/OFF

      • Observe combination meter assembly

      • ECB: Electronically Controlled Brake System

    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
      ECB Warning Light Brake warning light / yellow (minor malfunction) ON or OFF

      ON: Warning light on

      OFF: Warning light off

      		 ECB: Electronically Controlled Brake System

      Chassis > ABS/VSC/TRC > Active Test
      Active Test Display
      ECB Warning Light
      Data List Display
      ECB Warning Light

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

      Result
      Result Proceed to
      Brake warning light / yellow (minor malfunction) in the Data List does not change using the Active Test (for RHD). A
      Brake warning light / yellow (minor malfunction) in the Data List does not change using the Active Test (for LHD). B
      Brake warning light / yellow (minor malfunction) in the Data List turns ON/OFF using the Active Test. C

    A

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY Click here

    B

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY Click here

    C

  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 ECB

    3. Check the combination meter assembly.

      OK
      The brake warning light / yellow (minor malfunction) turns on or off in accordance with the GTS operation.
      Result
      Result Proceed to
      OK (for RHD) A
      OK (for LHD) B
      NG C

    A

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY Click here

    B

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY Click here

    C

    INSPECT METER / GAUGE SYSTEM Click here