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ELECTRIC PARKING BRAKE SYSTEM Electric Parking Brake does not Operate

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DTC Code DTC Name
  Electric Parking Brake does not Operate
Table 1. *1 ECU-IG1 NO. 2 *2 Combination Meter Assembly *3 Skid Control ECU (Brake Actuator Assembly) *4 CAN Communication Line
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WIRING DIAGRAM

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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 ON.

Tip:

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

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PROCEDURE


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    CHECK CAN COMMUNICATION SYSTEM


    1. Check if CAN communication system DTCs are output.


      1. Chassis > ABS/VSC/TRC > Trouble Codes


      Result
      Result Proceed to
      DTCs are not output A
      DTCs are output B

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    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.

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      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

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    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 / ABS/VSC/TRC/EPB / Data List.

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


      1. Chassis > ABS/VSC/TRC > 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



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




    7. Select the Data List on the GTS.


      1. Chassis > ABS/VSC/TRC > Data List
        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

        		 -



      1. Chassis > ABS/VSC/TRC > 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
      The value of the Data List item does not change in accordance with the Active Test. A
      The value of the Data List item changes in accordance with the Active Test. B

    • A

      REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) for LHD:Click here

      REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) for RHD:Click here

    • BClick here
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    INSPECT COMBINATION METER ASSEMBLY


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


      1. Body Electrical > Combination Meter > Active Test
        Tester Display
        Park Warning




    2. Check the combination meter assembly.

      OK
      Parking brake indicator light (red) turns on or off in accordance with GTS operation.
      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) for LHD:Click here

      REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) for RHD:Click here

    • NG

      GO TO METER / GAUGE SYSTEMClick here

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


    1. Turn the ignition switch off.

    2. B0071RIC79
      *a

      Front view of wire harness connector

      (to Skid Control ECU (Brake Actuator Assembly))

      Disconnect the A34 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
      A34-36 (IG1) - Body ground Ignition switch ON 11 to 14 V
      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) for LHD:Click here

      REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) for RHD:Click here

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR