ELECTRIC PARKING BRAKE SYSTEM Electric Parking Brake does not Operate

WIRING DIAGRAM

A01GXEQE04

INSPECTION PROCEDURE

Note


  • If the electric parking brake ECU or parking brake with bracket actuator assembly is replaced, perform the "RESET MEMORY" and "ACQUIRE TENSION SENSOR ZERO POINT" procedures Click here.

  • Even after the power switch is turned OFF, the electric parking brake ECU may store a DTC as a result of removing a connector or fuse, as the ECU is still operating. Therefore, during inspection or replacement, turn the power switch OFF and wait for 20 seconds before removing the following: 1) connectors of the electric parking brake ECU, and 2) fuses of the electric parking brake system circuit.

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 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

    GO TO PARKING BRAKE ASSEMBLY (INSPECTION) Click here

    C

    INSPECT FUSE (RR ECU-B) Click here

    A

  2. CHECK PARKING BRAKE INDICATOR LIGHT (RED) (ACTIVE TEST)


    1. Turn the power switch OFF.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the power switch ON (IG) and the tester 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 tester.

      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 tester.

    NG

    CHECK HARNESS AND CONNECTOR (ECU - METER) Click here

    OK

    REPLACE ELECTRIC PARKING BRAKE ECU Click here

  3. CHECK HARNESS AND CONNECTOR (ECU - METER)

    A01GZZ1E03

    1. Disconnect the S46 ECU connector.

    2. Disconnect the L124 meter connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      S46-7 (TX) - L124-24 (EPB)* Always Below 1 Ω
      S46-7 (TX) - Body ground Always 10 kΩ or higher

      Tech Tips

      *: EPB 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. INSPECT FUSE (RR ECU-B)


    1. Remove the RR ECU-B fuse from the luggage room junction block.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      RR ECU-B fuse Always Below 1 Ω
      Result
      Result Proceed to
      Outside of the specified condition A
      Within the specified condition B

    B

    CHECK HARNESS AND CONNECTOR (ECU - AUXILIARY BATTERY) Click here

    A

  5. CHECK HARNESS AND CONNECTOR (ECU - FUSE)


    1. Disconnect the S48 ECU connector.

    2. A01GZJFE03

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

      Standard resistance
      Tester Connection Condition Specified Condition
      S48-2 (BECU) - Body ground Always 10 kΩ or higher

    NG

    CHECK FOR SHORT IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE

    OK

    REPLACE FUSE

  6. CHECK HARNESS AND CONNECTOR (ECU - AUXILIARY BATTERY)


    1. Disconnect the S48 ECU connector.

    2. A01GZJFE03

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

      Standard voltage
      Tester Connection Condition Specified Condition
      S48-2 (BECU) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ELECTRIC PARKING BRAKE ECU Click here