ELECTRIC PARKING BRAKE SYSTEM Electric Parking Brake does not Operate

WIRING DIAGRAM

B004XIOE11

CAUTION / NOTICE / HINT

Note


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

  • The electric parking brake may still operate up to 20 seconds after the power switch is turned off. Before disconnecting connectors or fuses, turn the power switch off and wait 20 seconds or more.

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

    Click here

  • If the parking brake with bracket actuator assembly is replaced, perform the "Reset Memory" and "Acquire Tension Sensor Zero Point" procedures.

    Click here

Tech Tips

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

PROCEDURE


  1. VEHICLE OPERATION CHECK


    1. Turn the power switch on (READY) and change the shift state to D. Then depress the brake pedal and push the electric parking brake switch assembly 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

    READ VALUE USING GTS (TENSION1 VOLTAGE, TENSION2 VOLTAGE) Click here

    C

    CHECK HARNESS AND CONNECTOR (BECU CIRCUIT) Click here

    A

  2. PERFORM 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.


      Chassis > Electric Parking Brake > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      PKB Light Parking brake indicator light (red) ON or OFF

      • Vehicle stopped

      • Power switch on (IG)

      • Parking brake released

      Chassis > Electric Parking Brake > Active Test
      Tester Display
      PKB Light
      OK
      Indicator light turns on when operating the GTS.
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE PARKING BRAKE ECU ASSEMBLY Click here

    NG

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


    1. Turn the power switch off.

    2. Disconnect the L76 parking brake ECU assembly connector.

    3. Disconnect the G34 combination meter assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L76-7 (TX) - G34-5 (EPB)* Always Below 1 Ω
      L76-7 (TX) or G34-5 (EPB)* - Body ground Always 10 kΩ or higher

      Tech Tips

      *: EPB stands for electric parking brake

      Result
      Proceed to
      OK
      NG

    OK

    GO TO METER / GAUGE SYSTEM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  4. READ VALUE USING GTS (TENSION1 VOLTAGE, TENSION2 VOLTAGE)


    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 / Data List.

    5. Check the values by referring to the table below.


      Chassis > Electric Parking Brake > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Tension1 Voltage Tension sensor 1 voltage display

      min.: 0.000 V

      max.: 5.000 V

      		 0.5 to 4.5 V When not normal, tension sensor system may be malfunctioning.
      Tension2 Voltage Tension sensor 2 voltage display

      min.: 0.000 V

      max.: 5.000 V

      		 0.5 to 4.5 V When not normal, tension sensor system may be malfunctioning.

      Chassis > Electric Parking Brake > Data List
      Tester Display
      Tension1 Voltage
      Tension2 Voltage
      OK
      Display changes according to operation of the electric parking brake switch assembly.
      Result
      Proceed to
      OK
      NG

    OK

    CHECK PARKING BRAKE ASSEMBLY Click here

    NG

    REPLACE PARKING BRAKE WITH BRACKET ACTUATOR ASSEMBLY Click here

  5. CHECK HARNESS AND CONNECTOR (BECU CIRCUIT)


    1. Turn the power switch off.

    2. Disconnect the parking brake ECU assembly connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      L77-2 (BECU) - Body ground Power switch off 11 to 14 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE PARKING BRAKE ECU ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR