ELECTRIC PARKING BRAKE SYSTEM Electric Parking Brake does not Operate

WIRING DIAGRAM

A01FVQGE09

INSPECTION PROCEDURE

Note


  • If the parking brake ECU assembly is replaced, perform the "Reset Memory" and "Acquire Tension Sensor Zero Point" procedures Click here.

  • Before disconnecting connectors or fuses, turn the power switch off and wait 20 seconds or more.

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

Tech Tips

The condition may be that the electric parking brake is operating normally but the meter's parking brake indicator light (red) is malfunctioning.

PROCEDURE


  1. VEHICLE OPERATION CHECK


    1. Turn the power switch on (READY) and move the shift lever to D. Then depress the brake pedal and push the electric parking brake switch to the lock side for 1 second. Check the parking brake indicator light (red) condition.

    2. Release the brake pedal and check that the vehicle does not move.

    3. Depress the brake pedal and pull the electric parking brake switch assembly to the release side for 1 second. Check the parking brake indicator light (red) condition.

    4. Release the brake pedal and check that the vehicle moves.

      Result
      Result Proceed to
      Lock and release control is normal; parking brake indicator light (red) is off or is blinking A
      Lock and release control is malfunctioning; parking brake indicator light (red) is illuminated or off depending on switch operation B
      Lock and release control is malfunctioning; parking brake indicator light (red) is off or is blinking C

    B

    INSPECT PARKING BRAKE ASSEMBLY Click here

    C

    CHECK HARNESS AND CONNECTOR (BATTERY - PARKING BRAKE ECU) Click here

    A

  2. PERFORM ACTIVE TEST USING GTS (PKB LIGHT)


    1. Turn the power switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the power switch on (IG) and the GTS on.

    4. Enter the following menus: Chassis / Electric Parking Brake / Active Test.

    5. Check the condition of the parking brake indicator light (red) by operating the GTS.

      Electric Parking Brake
      Tester Display Test Part Control Range Diagnostic Note
      PKB Light Parking brake indicator light (red) ON or OFF Vehicle speed is 0 km/h (0 mph)
      OK
      Indicator light turns on when operating the GTS.

    NG

    CHECK HARNESS AND CONNECTOR (PARKING BRAKE ECU - COMBINATION METER) Click here

    OK

    REPLACE PARKING BRAKE ECU ASSEMBLY Click here

  3. CHECK HARNESS AND CONNECTOR (PARKING BRAKE ECU - COMBINATION METER)


    1. Disconnect the U36 parking brake ECU assembly connector.

    2. Disconnect the N40 combination meter assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      U36-7 (TX) - N40-31 (EPB)* Always Below 1 Ω
      U36-7 (TX) - Body ground Always 10 kΩ or higher

      Tech Tips

      *: Stands for electric parking brake


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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

  4. CHECK HARNESS AND CONNECTOR (BATTERY - PARKING BRAKE ECU)


    1. Disconnect the parking brake ECU assembly connector.

    2. A01FQ2KE10
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Parking Brake ECU Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      U37-2 (BECU) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE PARKING BRAKE ECU ASSEMBLY Click here