VEHICLE STABILITY CONTROL SYSTEM Brake Warning Light Remains ON

DESCRIPTION

The brake warning light comes on when brake fluid is insufficient, the parking brake is applied or the EBD is defective.

WIRING DIAGRAM

A01EQRPE02

INSPECTION PROCEDURE

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 OUTPUT DTC 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 1UR-FE) B
      NG (for 3UR-FE) 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: Click here, 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. PERFORM ACTIVE TEST USING GTS (INDICAT. LAMP BRAKE)


    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. Enter the following menus: Body Electrical / Combination Meter / Active Test.

    5. Check the condition of the brake warning light by operating the GTS.

      Combination Meter
      Tester Display Test Part Control Range Diagnostic Note
      Indicat. Lamp Brake Brake Warning Light ON or OFF Perform the test with the vehicle stopped and engine idling.
      OK
      The warning light turns on when operating the GTS.

    NG

    GO TO METER / GAUGE SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here

    OK

  7. CHECK HARNESS AND CONNECTOR (IG1 TERMINAL)


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

    2. A01ENMBE68
      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

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


    1. A01ENXME58
      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

  9. INSPECT PARKING BRAKE SWITCH


    1. A01EN5VE01
      Text in Illustration
      *a

      Component without harness connected

      (Parking Brake Switch Assembly)

      Disconnect the E53 parking brake switch connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      1 - Body ground

      Parking brake applied

      (Switch pin free)

      		 Below 1 Ω

      Parking brake released

      (Switch pin pushed in)

      		 10 kΩ or higher

    NG

    REPLACE PARKING BRAKE SWITCH ASSEMBLY Click here

    OK

  10. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - PARKING BRAKE SWITCH)


    1. Turn the engine switch off.

    2. Disconnect the E53 parking brake switch connector.

    3. Disconnect the 2D main body ECU (cowl side junction block LH) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2D-22 - E53-1 Always Below 1 Ω
      2D-22 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  11. PERFORM ACTIVE TEST USING GTS (BRAKE WARNING LIGHT)


    1. Turn the engine switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the engine switch on (IG).

    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 warning light Warning light ON/OFF Observe the combination meter.

    6. When performing the Brake Warning Light Active Test, check Brake Warning Light in the Data List.

      ABS/VSC/TRC
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Brake Warning Light Brake warning light/ 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

    B

    REPLACE MASTER CYLINDER SOLENOID Click here

    C

    REPLACE MASTER CYLINDER SOLENOID Click here

    A

    REPLACE MAIN BODY ECU (COWL SIDE JUNCTION BLOCK LH)