VEHICLE STABILITY CONTROL SYSTEM Brake Warning Light Remains ON

DESCRIPTION

When one of the following conditions is met, the brake warning light remains on:


WIRING DIAGRAM

A01DXEOE04

INSPECTION PROCEDURE

Note


  • After replacing the brake actuator assembly, perform calibration Click here.

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

  • Before disconnecting the connector, make sure that there are no problems with the connection.

  • After disconnecting the connector, make sure that the connector case and terminals are not deformed or corroded.

PROCEDURE


  1. CHECK FOR DTC


    1. Check for DTCs Click here.

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

    B

    REPAIR CIRCUITS INDICATED BY OUTPUT DTCS Click here

    A

  2. CHECK IF SKID CONTROL ECU 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 ECU CORRECTLY

    OK

  3. CHECK TERMINAL VOLTAGE (IG1 TERMINAL)


    1. Turn the ignition switch off.

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

    3. A01DW3AE58
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Skid Control ECU [Brake Actuator Assembly])

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      S35-34 (IG1) - Body ground Ignition switch ON 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (GND1 TERMINAL)


    1. Turn the ignition switch off.

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      S35-1 (GND1) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK BRAKE BOOSTER ASSEMBLY


    1. Check the brake booster assembly Click here.


    NG

    REPLACE BRAKE BOOSTER ASSEMBLY Click here

    OK

  6. INSPECT BRAKE FLUID LEVEL WARNING SWITCH


    1. Turn the ignition switch to ON.

    2. With the brake fluid at the specified level, disconnect the brake fluid level warning switch (brake master cylinder reservoir sub-assembly) connector and check the brake warning light.

      Result
      Result Proceed to
      Brake warning light turns off A
      Brake warning light does not turn off for 1KD-FTV and 2KD-FTV B
      except for 1KD-FTV and 2KD-FTV C

      Tech Tips

      If the brake warning light turns off, the brake fluid level warning switch (brake master cylinder reservoir sub-assembly) has an internal short circuit.


    B

    CHECK VACUUM WARNING SWITCH ASSEMBLY Click here

    C

    INSPECT PARKING BRAKE SWITCH ASSEMBLY Click here

    A

    REPLACE BRAKE MASTER CYLINDER RESERVOIR SUB-ASSEMBLY Click here

  7. CHECK VACUUM WARNING SWITCH ASSEMBLY


    1. Start the engine.

    2. Idle the engine.

    3. Disconnect the vacuum warning switch connector and check the brake warning light.

      Result
      Result Proceed to
      Brake warning light does not turn off A
      Brake warning light turns off B

      Tech Tips

      If the brake warning light turns off, the vacuum warning switch has an internal short circuit.


    B

    REPLACE VACUUM WARNING SWITCH ASSEMBLY Click here

    A

  8. INSPECT PARKING BRAKE SWITCH ASSEMBLY


    1. Turn the ignition switch off.

    2. Remove the parking brake switch.

    3. A01DWR1E02
      Text in Illustration
      *a

      Component without harness connected

      (Parking Brake Switch Assembly)
      A01E2TX On
      A01DZ8Z Off

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      Switch connector terminal - Switch body On (Shaft is not pressed) Below 1 Ω
      Off (Shaft is pressed) 10 kΩ or higher

    NG

    REPLACE PARKING BRAKE SWITCH ASSEMBLY

    OK

  9. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - COMBINATION METER AND PARKING BRAKE SWITCH)


    1. Turn the ignition switch off.

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

    3. Disconnect the C25 combination meter connector.

    4. Disconnect the parking brake switch connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      S35-8 (BRL) - C25-26 Always Below 1 Ω
      S35-8 (BRL) - Body ground Always 10 kΩ or higher
      S35-29 (PKB) - P2-1 Always Below 1 Ω
      S35-29 (PKB) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. CHECK HARNESS AND CONNECTOR (COMBINATION METER - BODY GROUND)


    1. Turn the ignition switch off.

    2. Disconnect the C25 combination meter connector.

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

    4. Disconnect the brake fluid level warning switch (brake master cylinder reservoir assembly) connector.

    5. Disconnect the vacuum warning switch connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C25-36 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  11. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (BRAKE WARNING LIGHT)


    1. Turn the ignition switch off.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the ignition switch to ON.

    4. Turn the intelligent tester 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: Brake warning light on

      OFF: Brake warning light off

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

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    C

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

    A

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here