ELECTRIC PARKING BRAKE SYSTEM Electric Parking Brake does not Operate

WIRING DIAGRAM

A001XNXE03

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 ignition switch is turned off. Before disconnecting connectors or fuses, turn the ignition switch off and wait 20 seconds or more.

  • When replacing the skid control ECU (brake actuator assembly), operate the electric parking brake switch assembly as the parking brake indicator light blinks (red) when the ignition switch is first turned to ON.

Tech Tips

Even if the electric parking brake is operating normally, the parking brake indicator light (red) on the combination meter may be malfunctioning.

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Check if CAN communication system DTCs are output.

      Click here


      Chassis > Electric Parking Brake > Trouble Codes
      Result
      Result Proceed to
      DTCs are not output A
      DTCs are output B

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  2. VEHICLE OPERATION CHECK


    1. When the vehicle's tires are lifted off the ground and the GTS is used to operate the electric parking brake, check the condition of the rear tires.

      Click here

      Result
      Result Proceed to
      Lock and release operation is normal and parking brake indicator light turns off or blinks (red) A
      Lock and release operation is malfunctioning and parking brake indicator light illuminates (red) or turns off according to switch operation B
      Lock and release operation is malfunctioning and parking brake indicator light turns off or blinks (red) C

    B

    INSPECT REAR BRAKE

    C

    CHECK HARNESS AND CONNECTOR (BATTERY - SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY)) Click here

    A

  3. PERFORM ACTIVE TEST USING GTS (PARKING BRAKE LIGHT)


    1. Turn the ignition switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the ignition switch to ON.

    4. Turn the GTS on.

    5. Enter the following menus: Chassis / Electric Parking Brake / Data List.

    6. Read the Data List according to the display on the GTS.

      Click here


      Chassis > ABS/VSC/TRC/EPB > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      PKB Light Parking brake indicator light (red) ON or OFF

      • Vehicle stopped

      • Ignition switch ON

      • Parking brake released

      Chassis > ABS/VSC/TRC/EPB > Active Test
      Tester Display
      PKB Light

    7. Select the Data List on the GTS.

      Click here


      Chassis > ABS/VSC/TRC/EPB > Data List

      Light: Parking brake indicator light (red) illuminates
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Parking Brake Light Parking brake indicator light (red) output signal OFF, Light or Blink

      OFF: Parking brake indicator light (red) turns off

      Light: Parking brake indicator light (red) illuminates

      Blink: Parking brake indicator light (red) flashes

      		 -

      Chassis > ABS/VSC/TRC/EPB > Data List
      Tester Display
      Parking Brake Light

    8. Check the operating condition of the parking brake indicator light (red) when operating it using the GTS.

      Result
      Result Proceed to
      Parking brake indicator light (red) in the Data List does not change using the Active Test. A
      Parking brake indicator light (red) in the Data List turns ON/OFF using the Active Test. B

    A

    REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) Click here

    B

  4. INSPECT COMBINATION METER ASSEMBLY


    1. Perform the Active Test of the combination meter assembly using the GTS.

      Click here


      Body Electrical > Combination Meter > Active Test
      Tester Display
      Indicat. Park

    2. Check the combination meter assembly.

      OK
      Parking brake indicator light (red) turns on or off in accordance with GTS operation.
      Result
      Result Proceed to
      OK (for LHD) A
      OK (for RHD) B
      NG C

    A

    REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) Click here

    B

    REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) Click here

    C

    GO TO METER / GAUGE SYSTEM Click here

  5. CHECK HARNESS AND CONNECTOR (BATTERY - SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY))


    1. Turn the ignition switch off.

    2. A005PMEC01
      *a

      Front view of wire harness connector

      (to Skid Control ECU (Brake Actuator Assembly))

      Disconnect the A42 skid control ECU (brake actuator assembly) connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A42-36 (IG1) - Body ground Ignition switch ON

      11 to 14 V*1

      9.5 to 14 V*2

      • *1: w/o Stop and Start System

      • *2: w/ Stop and Start System

      Result
      Result Proceed to
      OK (for LHD) A
      OK (for RHD) B
      NG (w/o Stop and Start System) C
      NG (w/ Stop and Start System) D

    A

    REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) Click here

    B

    REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    D

    GO TO STOP AND START SYSTEM Click here