VEHICLE STABILITY CONTROL SYSTEM Brake Warning Light Remains ON

DESCRIPTION

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


WIRING DIAGRAM

A01365ME01

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK BRAKE FLUID LEVEL


    1. Check the amount of brake fluid in the brake reservoir.

      OK
      Brake fluid level is correct.

    NG

    ADD BRAKE FLUID

    OK

  2. CHECK DTC


    1. Turn the ignition switch to ON.

    2. Check if the DTC is recorded Click here.

      Result
      Result Proceed to
      DTC not output A
      DTC output B

    B

    REPAIR CIRCUITS INDICATED BY OUTPUT DTCS Click here

    A

  3. 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

  4. CHECK BATTERY


    1. Check the battery voltage.

      Standard voltage
      11 to 14 V

    NG

    CHECK OR REPLACE CHARGING SYSTEM OR BATTERY

    OK

  5. CHECK BRAKE WARNING LIGHT


    1. Turn the ignition switch to OFF and disconnect the skid control ECU connector.

    2. A0136MKE36

      Ground terminal EBDW of the skid control ECU.

    3. Turn the ignition switch to ON.

    4. Check the brake warning light.

      OK
      EBDW - GND Condition Illumination Condition
      Connecting OFF
      Disconnecting ON

      Tech Tips


      • When the brake warning light goes out, ground failure, the parking brake switch failure or open circuits in the brake actuator should be considered.

      • When the brake warning light remains illuminated, the brake fluid level warning switch failure, opens in the wire harness among the combination meters or abnormalities in the meter circuit should be considered.


    NG

    CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - COMBINATION METER) Click here

    OK

  6. INSPECT SKID CONTROL ECU (IG1 TERMINAL)


    1. A0136MKE32

      Disconnect the skid control ECU connector.

    2. Turn the ignition switch to ON.

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

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      A41-28 (IG1) - Body ground Ignition switch ON 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT)

    OK

  7. INSPECT SKID CONTROL ECU (GND TERMINAL)


    1. A0136MKE30

      Turn the ignition switch to OFF.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      A41-4 (GND1) - Body ground Always Below 1 Ω
      A41-1 (GND2) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT)

    OK

  8. INSPECT PARKING BRAKE SWITCH


    1. A0136ZME01

      Turn the ignition switch to 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

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


    1. Disconnect the skid control ECU connector and the parking brake switch connector.

    2. A0138GNE01

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

      Standard resistance
      Tester Connection Condition Specified Condition
      A41-31 (PKB) - H10-1 Always Below 1 Ω
      A41-32 (PKB) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

  10. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - COMBINATION METER)


    1. Disconnect the skid control ECU connector and the combination meter connector.

    2. Inspect both the connector case and the terminal for deformation and corrosion.

      OK
      No deformation or corrosion.
    3. A0137L3E03

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

      Standard resistance
      Tester Connection Condition Specified Condition
      A41-12 (EBDW) - A22-15 (EBD) Always Below 1 Ω
      A41-12 (EBDW) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  11. INSPECT BRAKE FLUID LEVEL WARNING SWITCH


    1. A0136E9E01

      Turn the ignition switch to 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 (E) Switch OFF (Float up) 10 kΩ or higher
      1 (+) - 2 (E) 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 Click here

    OK

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


    1. Disconnect the combination meter connector and the brake fluid level warning switch connector.

    2. A01377AE01

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

      Standard resistance
      Tester Connection Condition Specified Condition
      A22-13 (SW) - A12-1 (+) Always Below 1 Ω
      A22-13 (SW) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here