ELECTRONICALLY CONTROLLED BRAKE SYSTEM Brake Warning Light Remains ON

DESCRIPTION

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

If any of the following is detected, the brake warning light / red (malfunction) remains on:


Tech Tips

If the brake warning light / yellow (minor malfunction) or ABS warning light remains illuminated, return its condition to normal Click here or Click here.

WIRING DIAGRAM

A01GKWRE02

INSPECTION PROCEDURE

Note


  • When replacing the skid control ECU, perform initialization of linear solenoid valve and calibration Click here.

  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE


  1. CHECK DTC


    1. Check if the ABS, VSC and/or electronically controlled brake system DTC is output Click here.

      Result
      Result Proceed to
      DTC is not output A
      DTC is output B

    B

    REPAIR CIRCUIT INDICATED BY OUTPUT CODE Click here

    A

  2. INSPECT CAN COMMUNICATION SYSTEM


    1. for LHD:

      Check if the CAN communication system DTC is output Click here.

      for RHD:

      Check if the CAN communication system DTC is output Click here.

      Result
      Result Proceed to
      DTC is not output A
      DTC is output (for LHD) B
      DTC is output (for RHD) C

    B

    GO TO CAN COMMUNICATION SYSTEM (for LHD) Click here

    C

    GO TO CAN COMMUNICATION SYSTEM (for RHD) Click here

    A

  3. INSPECT IF SKID CONTROL ECU CONNECTOR IS SECURELY CONNECTED


    1. Check the skid control ECU connector's connection.

      OK
      The connector is securely connected.

    NG

    CONNECT CONNECTOR TO ECU CORRECTLY

    OK

  4. INSPECT BATTERY


    1. Check the battery voltage.

      Result
      Result Proceed to

      OK

      (Standard voltage: 11 to 14 V)

      		 A

      for 1UR-FSE:

      NG

      		 B

      for 1UR-FE:

      NG

      		 C

    B

    INSPECT CHARGING SYSTEM (for 1UR-FSE) Click here

    C

    INSPECT CHARGING SYSTEM (for 1UR-FE) Click here

    A

  5. CHECK TERMINAL VOLTAGE (IG1, IG2)


    1. A01GM7IE22

      Disconnect the A19 and A21 ECU connectors.

    2. Turn the engine switch on (IG).

    3. Measure the voltage according to the value(s) in the table below.

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      A19-46 (IG1) - A19-1 (GND) Engine switch on (IG) 11 to 14 V
      A21-46 (IG2) - A21-1 (GND4) Engine switch on (IG) 11 to 14 V

    4. Measure the resistance according to the value(s) in the table below.

      Standard resistance
      Tester Connection Condition Specified Condition
      A19-1 (GND) - Body ground Always Below 1 Ω
      A21-1 (GND4) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT)

    OK

  6. INSPECT COMBINATION METER ASSEMBLY


    1. Check the combination meter Click here.

      Tech Tips

      If troubleshooting has been carried out according to the PROBLEM SYMPTOMS TABLE, refer back to the table and proceed to the next step before replacing the part Click here.

      Result
      Result Proceed to
      OK (for LHD) A
      OK (for RHD) B
      NG C

    B

    REPLACE SKID CONTROL ECU (for RHD) Click here

    C

    REPLACE NO. 1 METER ECU SUB-ASSEMBLY Click here

    A

    REPLACE SKID CONTROL ECU (for LHD) Click here