POWER BACK DOOR SYSTEM DETAILS


  1. FUNCTION OF MAIN COMPONENTS

    Component Function
    Power Back Door Unit Assembly Power Back Door ECU

    • Controls the power back door system in accordance with the signals received from the switches, sensors and ECU.

    • Receives the signals from the 2 Hall ICs to detect the back door position and the opening and closing speed of the back door.
    Power Back Door Motor Opens and closes the back door when actuated by the power back door ECU.
    Magnetic Clutch

    (Magnetic Clutch On)


    • Transmits the rotation of the power back door motor to the driven gear to allow power operation of the back door.

    (Magnetic Clutch Off)


    • Disconnects the power back door motor from the driven gear to allow the back door to be opened manually.
    Back Door Lock Assembly Back Door Lock Motor Locks and unlocks the back door (latch) when actuated by the power back door ECU.
    Latch Switch Detects if the back door is ajar.
    Position Switch Detects the initial (neutral) position of the driven gear of the back door lock motor. The switch is on when the back door lock operates to the open side, and off when it operates to the close side.
    Courtesy Switch Detects whether the back door is open or closed. This switch turns on when the back door is open or ajar and turns off when the back door is closed.
    Back Door Control Switch The back door opens or closes when the back door control switch in the vehicle is turned on.
    Power Back Door Closer Switch (Door Control Switch Assembly) The power back door closes when the power back door closer switch (door control switch assembly) is turned on (pressed).
    Power Back Door Main Switch

    • Setting this switch prohibits system operation.

    • In case that this switch has been set, it is possible to open or close the back door manually because the magnetic clutch of the power back door motor is off.
    Back Door Opener Switch Assembly The back door latch opens when the back door opener switch on the outside of the vehicle is turned on (operated).
    Power Back Door Warning Buzzer When the power back door system starts to operate, the power back door warning buzzer and wireless door lock buzzer sound to inform the user that the system is operating. The buzzers also sound if the operating conditions have not been met or if a jam is detected.
    Wireless Door Lock Buzzer
    Power Back Door Sensor Assembly RH/LH Detects if an object is jammed in the back door.
    Main Body ECU (Driver Side Junction Block Assembly)

    • Transmits a back door lock/unlock control signal, vehicle speed signal, and a shift position P signal to the power back door ECU via CAN.

    • Receives a hazard request signal from the power back door ECU via CAN.

    • Operates the turn signal flasher assembly.
    Electrical Key Transmitter Sub-assembly Transmits the power back door button signal to the door control receiver.
    Door Control Receiver Receives the power back door button signal and transmits it to the main body ECU (driver side junction block assembly) or certification ECU (smart key ECU assembly).

  2. OPERATING CONDITION


    1. The power back door system activates when the following conditions are all met:


      1. The power back door main switch is off (the power back door opener has not been disabled using the switch).

      2. Shift lever is in P.

      3. Vehicle speed is 3 km/h (2 mph) or less.

      4. The power back door touch sensor circuit is not open.

  3. SYSTEM CONTROL


    1. This system performs the function listed below.

      Function Outline
      Opener Function Upon receiving an on signal from the power back door opener/closer switch or the power back door button on the electrical key transmitter sub-assembly with the back door unlocked, the power back door ECU actuates the back door lock motor and the power back door motor in order to release the latch of the back door lock and open the back door.
      One-motion Opener Function Upon receiving an on signal from the power back door button on the electrical key transmitter sub-assembly with the back door locked, the power back door ECU actuates the back door lock motor and the power back door motor in order to release the latch of the back door lock and open the back door.
      Closer Function Upon receiving an on signal from the power back door control switch, the power back door closer switch with the back door open, or the power back door button on the electrical key transmitter sub-assembly, the power back door ECU actuates the power back door motor and the back door lock motor in order to close the back door and engage the latch of the back door lock.
      Jam Protection Function Upon receiving the signals from a touch sensor or the Hall ICs of the power back door motor, the power back door ECU detects that an object is jammed in the back door, and reverses the movement of the power back door motor. The power back door warning buzzer sounds for 0.1 seconds when a jammed object is detected.
      Reverse Control Function During a power back door operation, if the power back door ECU detects an on signal from the back door control switch or the power back door button on the electrical key transmitter sub-assembly, the power back door ECU sounds the power back door warning buzzer for approximately 0.1 seconds and reverses the power back door motor in order to reverse the back door to a predetermined position.
      Back Door Open/Close Speed Control Function

      In accordance with the signals received from the Hall ICs, the power back door ECU performs the following controls:


      • It reduces the closing speed from approximately 330 mm (13.0 in.) before the back door is fully closed, in order to reduce the jamming load.

      • It reduces the opening speed from approximately 250 mm (9.8 in.) before the back door is fully open, in order to reduce the shock that occurs when the door reaches the fully open position.

    2. Jam Protection Function


      1. The power back door ECU determines a jam based on the operation of the power back door and reverses the operation of the back door.

        Power Back Door Operation Detection Item Action
        Close

        The back door is reversed when one of the following conditions is met:


        • Jam condition detected through Hall IC signal.

        • Lock condition detected through Hall IC signal.

        • Jam condition detected through a touch sensor.

        		 Depending on detection timing, the close operation is canceled and the power back door warning buzzer sounds. → Back door is reversed (door is opened)
        During Lock

        The back door is reversed when one of the following conditions is met:


        • Lock condition detected through Hall IC signal.

        • Jam condition detected through a touch sensor.

        		 Depending on detection timing, the close operation is canceled and the power back door warning buzzer sounds and the lock is released. → Back door is reversed (door is opened)
        Open

        The back door is reversed when one of the following conditions is met:


        • Jam condition detected through Hall IC signal.

        • Lock condition detected through Hall IC signal.

        		 Depending on detection timing, the open operation is canceled and the power back door warning buzzer sounds. → Back door is reversed (door is closed)

  4. CONSTRUCTION


    1. Power Back Door Sensor Assembly


      1. The power back door sensor assembly consists of conductive rubber and a core wire. When the conductive rubber is compressed its resistance value goes down and electric current flows through the core wire. This signal is input to the power back door ECU, which determines the back door condition.

        A01F0RNE01
        Text in Illustration
        *1 Power Back Door Sensor Assembly LH *2 Power Back Door Sensor Assembly RH
        *a Core Wire *b Conductive Rubber
        *c Normal Condition *d Compressed Condition

  5. OPERATION


    1. Opener Operation


      1. The power back door control switch, the power back door button on the electrical key transmitter sub-assembly or back door opener switch assembly is turned on for 1 second or more with the back door unlocked.

      2. The power back door warning buzzer and wireless door lock buzzer continue to sound while the power back door button is being pressed. The hazard lights will flash twice simultaneously with the start of the operation.

      3. The back door lock motor operates to release the latch.

      4. Through the state of the courtesy switch, the power back door ECU detects that the latch has been released, and actuates the power back door motor to start opening the back door.

      5. Through the state of the latch switch, the power back door ECU detects that the back door is open, and reverses the back door lock motor to its initial position.

      6. Through the state of the sector switch, the power back door ECU detects that the motor has returned to its initial position. Then, it stops the back door lock motor.

      7. Through the Hall ICs of the power back door motor, the power back door ECU detects the back door position, and stops the power back door motor just before the back door reaches the fully open position, and turns off the magnetic clutch.

        A01F0PXE01

    2. One-motion Opener Function


      1. The power back door button on the electrical key transmitter sub-assembly is turned on for 1 second or more with the back door locked.

      2. The power back door warning buzzer and wireless door lock buzzer continue to sound while the power back door button is being pressed. The hazard lights will flash twice simultaneously with the start of the operation.

      3. The back door lock motor operates to release the latch.

      4. Through the state of the courtesy switch, the power back door ECU detects that the latch has been released, and actuates the power back door motor to start opening the back door.

      5. Through the state of the latch switch, the power back door ECU detects that the back door is open, and reverses the back door lock motor to its initial position.

      6. Through the state of the position switch, the power back door ECU detects that the motor has returned to its initial position. Then, it stops the back door lock motor.

      7. Through the Hall ICs of the power back door motor, the power back door ECU detects the back door position, and stops the power back door motor just before the back door reaches the fully open position, and turns off the magnetic clutch.

        A01F0PBE01

    3. Closer Function


      1. The back door control switch, the power back door closer switch (door control switch assembly), or the power back door button on the electrical key transmitter sub-assembly is turned on for 1 second or more with the back door open, or the back door is manually closed to a predetermined position.

      2. The power back door buzzer warning continues to sound while the power back door button is being pressed. The hazard lights will flash twice simultaneously with the start of the operation.

      3. The power back door ECU actuates the power back door motor to start closing the back door.

      4. Upon detecting that the latch is disengaged through the state of the latch switch, the power back door ECU actuates the back door lock motor to engage the latch.

      5. Upon detecting that the back door has closed through the state of the courtesy switch, the power back door ECU stops the magnetic clutch and the power back door motor.

      6. Upon detecting that the latch has been engaged through the state of the latch switch (on R off), the power back door ECU operates the back door lock motor forward in order to fully close the back door.

      7. If the power back door ECU detects that the latch switch has been turned on again after the back door has fully closed, it stops the back door lock motor. Then, it operates the back door lock motor in reverse until the sector switch turns on.

        A01F0VNE01

  6. FAIL-SAFE


    1. If the power back door ECU detects any of the malfunctions listed below during power back door operation, the power back door ECU stops the power back door motor and sounds the power back door warning buzzer simultaneously, then turns OFF the magnetic clutch and stops the system.


      1. Open circuit in the power back door touch sensor.

      2. The power back door motor is operated continuously for 30 seconds or more.

      3. Abnormal back door position signal (Hall IC signal).

      4. Abnormality with switches on the back door lock assembly.

    2. During a power back door operation, if the shift lever is shifted to a position other than P, the power back door ECU performs the aforementioned fail-safe operation.

  7. DIAGNOSIS


    1. If the power back door ECU detects a malfunction in the power back door system, the power back door ECU stores a Diagnostic Trouble Code (DTC) and information related to the fault in the main body ECU (driver side junction block assembly) via the CAN. For details, refer to the Repair Manual.