VEHICLE STABILITY CONTROL SYSTEM Brake Warning Light Remains ON

DESCRIPTION

The skid control ECU (brake actuator assembly) is connected to the combination meter assembly via CAN communication.

If any of the following is detected, the brake warning light remains on:


WIRING DIAGRAM

A003CWYE01

INSPECTION PROCEDURE

Note


  • When replacing the skid control ECU (brake actuator assembly), perform zero point calibration and store system information Click here.

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

PROCEDURE


  1. CHECK CAN COMMUNICATION LINE


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

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

    B

    CHECK CAN COMMUNICATION SYSTEM Click here

    A

  2. CHECK IF BRAKE ACTUATOR ASSEMBLY CONNECTOR IS SECURELY CONNECTED


    1. Check if the skid control ECU (brake actuator assembly) connector is securely connected.

      OK
      The connector is securely connected.

    NG

    CONNECT CONNECTOR TO BRAKE ACTUATOR ASSEMBLY CORRECTLY

    OK

  3. INSPECT BATTERY


    1. Check the battery voltage.

      Standard voltage
      11 to 14 V

      Tech Tips

      Refer to the inspection procedures:
      Item See page
      1KD-FTV

      Click here

      2KD-FTV

      Click here

      1TR-FE

      Click here

      2TR-FE (except Dual VVT-i)

      Click here

      2TR-FE (w/ Dual VVT-i)

      Click here


    NG

    CHECK OR REPLACE CHARGING SYSTEM OR BATTERY

    OK

  4. CHECK TERMINAL VOLTAGE (IG1 TERMINAL)


    1. Turn the ignition switch off.

    2. A003DRZE08
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Skid Control ECU (Brake Actuator Assembly))

      Disconnect the B92 skid control ECU (brake actuator assembly) connector.

    3. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      B92-12 (IG1) - Body ground Ignition switch ON 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT)

    OK

  5. CHECK HARNESS AND CONNECTOR (GND1 TERMINAL)


    1. A003DRZE03
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Skid Control ECU (Brake Actuator Assembly))

      Turn the ignition switch off.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B92-25 (GND1) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (GND1 CIRCUIT)

    OK

  6. CHECK ENGINE TYPE


    1. Check the engine type.

      Result
      Result Proceed to
      1KD-FTV or 2KD-FTV A
      1TR-FE or 2TR-FE B

    B

    INSPECT BRAKE MASTER CYLINDER RESERVOIR SUB-ASSEMBLY Click here

    A

  7. INSPECT VACUUM WARNING SWITCH ASSEMBLY


    1. Turn the ignition switch off.

    2. Disconnect the A43 vacuum warning switch assembly connector.

    3. Inspect the vacuum warning switch assembly Click here.

      OK
      The vacuum warning switch assembly is normal.

    NG

    REPLACE VACUUM WARNING SWITCH ASSEMBLY Click here

    OK

  8. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - VACUUM WARNING SWITCH ASSEMBLY)


    1. Disconnect the H20 combination meter assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H20-32 (BRL) or A43-2 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. INSPECT BRAKE MASTER CYLINDER RESERVOIR SUB-ASSEMBLY


    1. Turn the ignition switch off.

    2. A003BMOE06
      Text in Illustration
      *a

      Component without harness connected

      (Brake Fluid Level Warning Switch (Brake Master Cylinder Sub-assembly))

      Remove the reservoir filler cap and strainer.

    3. Disconnect the A10 brake fluid level warning switch (brake master cylinder sub-assembly) 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 (E) Switch off (Float up) Below 1 Ω
      Switch on (Float down) 10 kΩ or higher

      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 SUB-ASSEMBLY Click here

    OK

  10. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - BRAKE MASTER CYLINDER RESERVOIR SUB-ASSEMBLY)


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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H20-31 (B/LE) or A10-1 (+) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  11. INSPECT PARKING BRAKE SWITCH ASSEMBLY


    1. Disconnect the B3 parking brake switch assembly connector.

    2. Inspect the parking brake switch assembly Click here.

      OK
      The parking brake switch assembly is normal.

    NG

    REPLACE PARKING BRAKE SWITCH ASSEMBLY Click here

    OK

  12. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - PARKING BRAKE SWITCH ASSEMBLY AND BRAKE ACTUATOR ASSEMBLY)


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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H20-11 (PKBI) or B3-1 or B92-3 (PKB) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  13. READ VALUE USING GTS (BRAKE WARNING LIGHT)


    1. Reinstall the reservoir filler cap and strainer.

    2. Reconnect the H20 combination meter assembly connector, A43 vacuum warning switch assembly connector*, A10 brake fluid level warning switch (brake master cylinder sub-assembly) connector, B3 parking brake switch assembly connector and B92 skid control ECU (brake actuator assembly) connector.


      • *: for 1KD and 2KD-FTV

    3. Connect the GTS to the DLC3.

    4. Turn the ignition switch to ON.

    5. Turn the GTS on.

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

    7. According to the display on the GTS, read 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

      		 -

    8. Check the GTS display condition of the brake warning light.

      Result
      Result Proceed to
      Display of the Data List remains OFF A
      Display of the Data List remains ON B

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    A

    INSPECT METER / GAUGE SYSTEM Click here