VEHICLE STABILITY CONTROL 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 remains on:


WIRING DIAGRAM

A011A26E01

INSPECTION PROCEDURE

Note

When replacing the brake actuator assembly, perform zero point calibration Click here.

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Check if CAN communication system DTCs are output Click here.

      Result
      Result Proceed to
      DTC not output A
      DTC output B

    B

    CHECK 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. INSPECT BATTERY


    1. Check the battery voltage.

      Standard voltage
      11 to 14 V

    NG

    CHECK OR REPLACE CHARGING SYSTEM OR BATTERY Click here

    OK

  4. INSPECT SKID CONTROL ECU (IG1 TERMINAL)


    1. Disconnect the A16 or A17 skid control ECU connector.

    2. Turn the ignition switch to ON.

    3. A01196QE15
      Text in Illustration
      *A for LHD
      *B for RHD
      *1

      Front view of wire harness connector

      (to Skid Control ECU)

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

      Standard Voltage
      for LHD
      Tester Connection Switch Condition Specified Condition
      A16-34 (IG1) - Body ground Ignition switch ON 11 to 14 V
      for RHD
      Tester Connection Switch Condition Specified Condition
      A17-34 (IG1) - Body ground Ignition switch ON 11 to 14 V
      Result
      Result Proceed to
      OK A
      NG (w/ Stop and Start System) B
      NG (w/o Stop and Start System) C

    B

    GO TO STOP AND START SYSTEM Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT)

    A

  5. INSPECT SKID CONTROL ECU (GND TERMINAL)


    1. Turn the ignition switch off.

    2. A01196QE14
      Text in Illustration
      *A for LHD
      *B for RHD
      *1

      Front view of wire harness connector

      (to Skid Control ECU)

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      A16-1 (GND1) - Body ground Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      A17-1 (GND1) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT)

    OK

  6. READ VALUE USING INTELLIGENT TESTER (PARKING BRAKE SWITCH)


    1. Reconnect the skid control ECU connector.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the ignition switch to ON.

    4. Enter the following menus: Chassis / ABS/VSC/TRC / Data List.

      ABS/VSC/TRC (Skid Control ECU)
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Parking Brake SW Parking brake switch / ON or OFF

      ON: Parking brake applied

      OFF: Parking brake released

      		 -

    5. Using the intelligent tester, check the input of the switch operation when the parking brake pedal is operated.

      OK
      When the parking brake is operated, the display changes as shown above.

    NG

    INSPECT PARKING BRAKE SWITCH Click here

    OK

  7. INSPECT BRAKE FLUID LEVEL WARNING SWITCH


    1. A01172WE01
      Text in Illustration
      *1

      Component with out harness connected

      (Brake Fluid Level Warning Switch)

      Turn the ignition switch off.

    2. Remove the reservoir filler cap and strainer.

    3. Disconnect the brake fluid level warning switch connector.

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

      Tech Tips

      A float is located inside the reservoir. Its position can be changed by increasing or decreasing the level of brake fluid.

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      1 - 2 Switch OFF (Float up) 10 kΩ or higher
      1 - 2 Switch ON (Float down) Below 1 Ω

      Tech Tips

      If there is no problem after finishing the above check, adjust the brake fluid level to the MAX level.


    NG

    REPLACE BRAKE MASTER CYLINDER RESERVOIR ASSEMBLY (BRAKE FLUID LEVEL WARNING SWITCH) Click here

    OK

  8. CHECK HARNESS AND CONNECTOR (COMBINATION METER - BRAKE FLUID LEVEL WARNING SWITCH)


    1. Disconnect the D2 combination meter connector.

      A011BUWE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Brake Fluid Level Warning Switch)

      		 *2

      Front view of wire harness connector

      (to Combination Meter)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D2-7 (SW) - A24-1 Always Below 1 Ω
      D2-7 (SW) - Body ground Always 10 kΩ or higher
      A24-2 - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. INSPECT COMBINATION METER ASSEMBLY


    1. Connect the intelligent tester to the DLC3.

    2. Perform Active Test of the combination meter using the intelligent tester Click here.

      OK
      The brake warning light turns ON or OFF in accordance with the intelligent tester.

      Tech Tips

      Reinstall the connectors and restore the vehicle to its prior condition before checking the combination meter.


    NG

    REPLACE COMBINATION METER ASSEMBLY Click here

    OK

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

  10. REPLACE COMBINATION METER ASSEMBLY


    1. Turn the ignition switch off.

    2. Replace the combination meter Click here.


    NEXT

  11. INSPECT COMBINATION METER ASSEMBLY


    1. Connect the intelligent tester to the DLC3.

    2. Perform Active Test of the combination meter using the intelligent tester Click here.

      OK
      The brake warning light turns ON or OFF in accordance with the intelligent tester.

    NG

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    OK

    END

  12. INSPECT PARKING BRAKE SWITCH


    1. A0119JCE01
      Text in Illustration
      *1

      Component without harness connected

      (Parking Brake Switch)

      Turn the ignition switch off.

    2. Disconnect the parking brake switch connector.

    3. 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 switch ON

      (Switch pin free)

      		 Below 1 Ω
      1 - Body ground

      Parking brake switch OFF

      (Switch pin pushed in)

      		 10 kΩ or higher

    NG

    REPLACE PARKING BRAKE SWITCH Click here

    OK

  13. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK - PARKING BRAKE SWITCH)


    1. Disconnect the 3C instrument panel junction block assembly connector.

      A0118QOE02
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Parking Brake Switch)

      		 *2

      Front view of wire harness connector

      (to Instrument Panel Junction Block Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3C-33 (PKB) - D52-1 Always Below 1 Ω
      3C-33 (PKB) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  14. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK - MAIN BODY ECU)


    1. Remove the main body ECU from the instrument panel junction block assembly.

      A01171PE03
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Instrument Panel Junction Block Assembly)

      		 *2

      Front view of wire harness connector

      (to Main Body ECU)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3C-33 - D42-12 (PKB) Always Below 1 Ω
      3C-33 - Body ground Always 10 kΩ or higher

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

    OK

    REPLACE MAIN BODY ECU