VEHICLE STABILITY CONTROL SYSTEM Brake Warning Light Remains ON

DESCRIPTION

The brake system warning light (red indicator) comes on when brake fluid is insufficient, the parking brake is applied or the EBD is defective.

WIRING DIAGRAM

B001B5FE12
*1 Skid Control ECU (Master Cylinder Solenoid)
*2 Combination Meter Assembly
*3 CAN Communication System

CAUTION / NOTICE / HINT

Note

After replacing the master cylinder solenoid, perform zero point calibration and store the system information Click here.

PROCEDURE


  1. CHECK DTC


    1. Check for DTCs Click here.

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

    B

    REPAIR CIRCUIT INDICATED BY OUTPUTDTC Click here

    A

  2. INSPECT IF SKID CONTROL ECU CONNECTOR IS SECURELY CONNECTED


    1. Check the skid control ECU (master cylinder solenoid) connector connection.

      OK
      The connector is securely connected.

    NG

    CONNECT CONNECTOR TO ECU CORRECTLY

    OK

  3. INSPECT BATTERY


    1. Check the battery voltage.

      Standard voltage
      11 to 14 V
      Result
      Result Proceed to
      OK A
      NG (for 3UR-FE) B
      NG (for 1VD-FTV) C

    B

    GO TO CHARGING SYSTEM (ON-VEHICLE INSPECTION) Click here

    C

    GO TO CHARGING SYSTEM (ON-VEHICLE INSPECTION) Click here

    A

  4. CHECK CAN COMMUNICATION LINE


    1. Turn the engine switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the engine switch on (IG) and the GTS on.

    4. Select "CAN Bus Check" from the System Selection Menu screen, and follow the prompts on the screen to inspect the CAN Bus.

      OK
      "CAN Bus Check" indicates no malfunctions in CAN communication.
      Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

    B

    GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here

    C

    GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here

    A

  5. CHECK DTC (CAN COMMUNICATION SYSTEM)


    1. Turn the engine switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the engine switch on (IG) and the GTS on.

    4. Check for DTCs (for LHD: See page , for RHD: Click here.

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

    B

    GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here

    C

    GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here

    A

  6. CHECK HARNESS AND CONNECTOR (IG1 TERMINAL)


    1. Disconnect the skid control ECU (master cylinder solenoid) connector.

    2. B0019PXE01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Skid Control ECU (Master Cylinder Solenoid))

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A24-46 (IG1) - Body ground Engine switch on (IG) 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. CHECK HARNESS AND CONNECTOR (GND1, GND2 AND GND3 TERMINAL)


    1. B0018RYE01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Skid Control ECU [Master Cylinder Solenoid])

      Turn the engine switch off.

    2. Disconnect the skid control ECU (master cylinder solenoid) connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A24-1 (GND1) - Body ground Always Below 1 Ω
      A24-32 (GND2) - Body ground Always Below 1 Ω
      A25-4 (GND3) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. PERFORM ACTIVE TEST USING GTS (BRAKE SYSTEM WARNING LIGHT (RED INDICATOR))


    1. Turn the engine switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the engine switch ON.

    4. Turn the GTS on.

    5. Enter the following menus: Chassis / ABS/VSC/TRC / Active Test.

      ABS/VSC/TRC
      Tester Display Test Part Control Range Diagnostic Note
      Brake Warning Light Brake system warning light (red indicator) Warning light ON/OFF Observe the combination meter assembly.

    6. When performing the Brake System Warning Light (Red Indicator) Active Test, check Brake System Warning Light (Red Indicator) in the Data List.

      ABS/VSC/TRC
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Brake Warning Light Brake system warning light (red indicator)/ ON or OFF

      ON: Warning light on

      OFF: Warning light off

      		 -
      Result
      Result Proceed to
      Data List Display Data List Display when Performing Active Test ON/OFF Operation
      ON Changes between ON and OFF A
      Does not change between ON and OFF (for LHD) B
      Does not change between ON and OFF (for RHD) C
      OFF Changes between ON and OFF A
      Does not change between ON and OFF (for LHD) B
      Does not change between ON and OFF (for RHD) C

    A

    REPLACE MAIN BODY ECU (COWL SIDE JUNCTION BLOCK LH)

    B

    REPLACE MASTER CYLINDER SOLENOID Click here

    C

    REPLACE MASTER CYLINDER SOLENOID Click here