ELECTRIC PARKING BRAKE SYSTEM Electric Parking Brake does not Operate

WIRING DIAGRAM

A003BTOE01

INSPECTION PROCEDURE

Note


  • Before performing work, turn the ignition switch off and wait approximately 20 seconds to make sure that the parking brake cannot operate.

  • When replacing the parking brake with bracket actuator assembly, perform zero point calibration Click here.

  • 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 PARK warning light in the combination meter is malfunctioning.

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (FULL RELEASE MODE)


    1. Turn the ignition switch off.

    2. Connect the intelligent tester to the DLC3.

    3. Select the Data List mode on the intelligent tester Click here.

      Electric Parking Brake
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Full Release Mode

      Full release mode/

      Not full or Full

      		 Not full

      Full: Full release mode

      Not full: Normal mode
      Result
      Result Proceed to
      Full A
      Not full B

    B

    PERFORM ACTIVE TEST USING INTELLIGENT TESTER (PKB RELEASE1, PKB LOCK1) Click here

    A

  2. CANCEL FULL RELEASE MODE


    1. Turn the ignition switch to ON.

    2. Press and hold the electric parking brake switch for 5 seconds to cancel full release mode.


    NEXT

    END

  3. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (PKB RELEASE1, PKB LOCK1)


    1. Perform the Active Test of the electric parking brake ECU using the intelligent tester Click here.

      Electric Parking Brake
      Tester Display Test Part Control Range
      PKB Lock1 Electric parking brake lock ON (Lock)
      PKB Release1 Electric parking brake release ON (Release)

    2. Check if the parking brake actuator operates with the intelligent tester.

    3. Check the PARK warning light condition.

      Result
      Result Proceed to
      Lock and release control is normal and PARK warning light is off or is blinking A
      Lock and release control is malfunctioning and PARK warning light is off or is blinking B

    B

    CHECK HARNESS AND CONNECTOR (+B TERMINAL) Click here

    A

  4. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (PKB LIGHT)


    1. Perform the Active Test of the electric parking brake ECU using the intelligent tester Click here.

    2. Check the condition of the PARK warning light by operating the tester.

      Electric Parking Brake
      Tester Display Test Part Control Range
      PKB Light PARK warning light ON or OFF
      OK
      PARK warning light turns on and off when operating it with the intelligent tester.

    NG

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

    OK

    REPLACE PARKING BRAKE WITH BRACKET ACTUATOR ASSEMBLY Click here

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

    A003AIGE01
    Text in Illustration
    *1

    Front view of wire harness connector

    (to Electric Parking Brake ECU)
    *2

    Front view of wire harness connector

    (to Combination Meter)

    1. Disconnect the electric parking brake ECU connector.

    2. Disconnect the combination meter connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I1-21 (TX) - D66-12 (TX+) Always Below 1 Ω
      I1-21 (TX) - Body ground Always 100 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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

  6. CHECK HARNESS AND CONNECTOR (+B TERMINAL)


    1. Disconnect the electric parking brake ECU connector.

    2. A003DINE02
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Electric Parking Brake ECU)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      I1-13 (+B) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE PARKING BRAKE WITH BRACKET ACTUATOR ASSEMBLY Click here