ELECTRONICALLY CONTROLLED BRAKE SYSTEM Brake Control Warning Light Remains ON

DESCRIPTION

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

If the skid control ECU stores a DTC, the brake warning light / yellow (minor malfunction) comes on in the combination meter sub-assembly.

WIRING DIAGRAM

B005YHHE09
*1 Combination Meter Sub-assembly
*2 Brake Booster with Master Cylinder

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. CHECK IF SKID CONTROL ECU CONNECTOR IS SECURELY CONNECTED


    1. Check if the skid control ECU connector is securely connected.

      OK
      The connector is securely connected.

    NG

    CONNECT CONNECTOR TO ECU CORRECTLY

    OK

  3. CHECK AUXILIARY BATTERY


    1. Check the auxiliary battery voltage.

      Standard Voltage
      11 to 14 V

    NG

    CHARGE OR REPLACE AUXILIARY BATTERY

    OK

  4. INSPECT COMBINATION METER SUB-ASSEMBLY


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

    2. 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