ELECTRONICALLY CONTROLLED BRAKE SYSTEM(w/o Vacuum Brake Booster) Brake Warning Light Remains ON

DESCRIPTION

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

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


WIRING DIAGRAM

B006CAWE01

CAUTION / NOTICE / HINT

Note


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

    Click here

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

PROCEDURE


  1. CHECK DTC


    1. Check if ABS, VSC and/or electronically controlled brake system DTCs are output.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes
      Result
      Result Proceed to
      DTCs are not output. A
      DTCs are output. B

    B

    REPAIR CIRCUITS INDICATED BY OUTPUT DTCS Click here

    A

  2. CHECK CAN COMMUNICATION SYSTEM


    1. Check if CAN communication system DTCs are output.

      Click here

      Result
      Result Proceed to
      DTCs are not output. A
      DTCs are output. B

    B

    INSPECT CAN COMMUNICATION SYSTEM Click here

    A

  3. CHECK IF SKID CONTROL ECU ASSEMBLY CONNECTOR IS SECURELY CONNECTED


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

      OK
      The connector is securely connected.
      Result
      Proceed to
      OK
      NG

    NG

    CONNECT CONNECTOR TO SKID CONTROL ECU ASSEMBLY CORRECTLY

    OK

  4. CHECK BATTERY


    1. Check the battery voltage.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      Battery Engine switch off 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    CHARGE OR REPLACE BATTERY

    OK

  5. CHECK HARNESS AND CONNECTOR (IG1 TERMINAL)


    1. Disconnect the A11 skid control ECU assembly connector.

    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
      A11-2 (IG1) - Body ground Engine switch on (IG) 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT)

    OK

  6. CHECK HARNESS AND CONNECTOR (GND TERMINAL)


    1. Turn the engine switch off.

    2. Disconnect the A13, A10 and A12 skid control ECU assembly connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A10-1 (GND) - Body ground Always Below 1 Ω
      A11-3 (GND2) - Body ground Always Below 1 Ω
      A11-1 (GND3) - Body ground Always Below 1 Ω
      A12-3 (GND4) - Body ground Always Below 1 Ω
      A12-1 (GND5) - Body ground Always Below 1 Ω
      A13-3 (GND6) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT)

    OK

  7. READ VALUE USING GTS (BRAKE WARNING LIGHT / RED (MALFUNCTION))


    1. Reconnect the A11, A13, A10 and A12 skid control ECU assembly connectors.

    2. Connect the GTS to the DLC3.

    3. Turn the engine switch on (IG).

    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 > Data List
      Tester Display
      Brake Warning Light

    5. Check the GTS display condition of the brake warning light / red (malfunction).

      Result
      Result Proceed to
      OFF is displayed A
      ON is displayed B

    A

    INSPECT METER / GAUGE SYSTEM Click here

    B

    REPLACE SKID CONTROL ECU ASSEMBLY Click here