ELECTRONICALLY CONTROLLED BRAKE SYSTEM Brake Control Warning Light does not Come ON

DESCRIPTION

The skid control ECU is connected to the combination meter sub-assembly via CAN communication.

CAUTION / NOTICE / HINT

Note

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

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Check if a CAN communication system DTC is output (See page for with Central Gateway ECU or Click here for without Central Gateway ECU).

      Result
      Result Proceed to
      DTC is not output A
      DTC is output (w/ Central Gateway ECU) B
      DTC is output (w/o Central Gateway ECU) 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.

      ABS/VSC/TRC
      Tester Display Test Part Control Range Diagnostic Note
      ECB* Warning Light Brake warning light / yellow (minor malfunction) Warning light ON/OFF Observe combination meter sub-assembly

      *: Electronically Controlled Brake System

    4. Check that the brake warning light / yellow (minor malfunction) on the combination meter sub-assembly turns on or off in accordance with the GTS operation.

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

      Tech Tips

      If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step before replacing the part Click here.


    A

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER Click here

    B

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER Click here

    C

  3. INSPECT COMBINATION METER SUB-ASSEMBLY


    1. Turn the power switch off (lock).

    2. Perform the Active Test of the combination meter sub-assembly (meter CPU) using the GTS Click here.

    3. Check the combination meter sub-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 LHD) A
      OK (for RHD) B
      NG (w/ Multi-information Display) C
      NG (w/o Multi-information Display) D

      Tech Tips

      If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step before replacing the part Click here.


    A

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER Click here

    B

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER Click here

    C

    REPLACE COMBINATION METER SUB-ASSEMBLY Click here

    D

    REPLACE METER CIRCUIT PLATE Click here