POWER BACK DOOR SYSTEM


  1. FUNCTION OF MAIN CONPNENTS

    Component Function
    Back Door Motor Unit Power Back Door ECU

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

    • The ECU receives signals from the pulse sensor and detects the position and opening and closing speed of the back door.

    • When operation switches are pressed, the ECU informs the user by sounding the power back door warning buzzer and flashing the hazard warning lights.
    Back Door Motor

    • The motor operates to open and close the back door.

    • The operating condition of the back door is detected by a built-in pulse sensor and pulse signals are sent to the power back door ECU.
    Back Door Lock Assembly Back Door Closer Motor When the back door becomes ajar, this motor operates to automatically fully close the back door.
    Sector Switch This switch detects the neutral position (initial position) of the back door closer motor and sector gear and outputs it to the power back door ECU.
    Pawl Switch This switch detects that the latch is opened and then closed and outputs a signal to the power back door ECU.
    Latch Switch This switch detects the ajar position of the latch and the fully closed position of the latch due to the closer operation and outputs a signal to the power back door ECU.
    Courtesy Switch This switch detects that the latch is fully closed and outputs a signal to the power back door ECU.
    Main Body ECU (Multiplex Network Body ECU) This ECU sends signals from the switches and ECUs to the power back door ECU.
    Combination Meter Assembly

    • The combination meter assembly receives hazard warning light flash request signals and flashes the hazard warning lights.

    • The combination meter assembly sends the vehicle speed signal to the main body ECU (multiplex network body ECU).
    Certification ECU (Smart Key ECU Assembly) This ECU sends power back door button signals from the power back door button (electrical key transmitter sub-assembly) to the power back door ECU.
    Power Slide Door Main Switch Power back door system on and off signals are output to the main body ECU (multiplex network body ECU).

    Door Control Switch Assembly


    • Power Back Door Control Switch

    • The back door opens or closes when the interior power back door control switch is turned on.

    • Switch signals are output to the main body ECU (multiplex network body ECU).
    Power Back Door Switch

    • The back door opens or closes when the back door switch positioned on the back door frame is turned on.

    • Switch signals are output to the power back door ECU.
    Back Door Opener Switch Assembly

    • The back door opens when the back door opener switch positioned on the exterior of the vehicle is turned on.

    • The switch signal is output to the certification ECU (smart key ECU assembly).
    Power Back Door Warning Buzzer This buzzer sounds when the system operates or malfunctions.
    Power Back Door Sensor Assembly This sensor detects jams during back door close operations.

  2. OPERATING CONDITION


    1. Power Back Door System Operating Conditions


      1. The engine switch is turned on (IG) and all of the following conditions are met:


        • The power slide door main switch is on

        • The back door is unlocked*

        • The shift position is P*

        • Vehicle Speed is less than approximately 3 km/h

      2. The engine switch is turned off or on (ACC) and all of the following conditions are met:


        • The power slide door main switch is on

        • The back door is unlocked

          Tech Tips

          *: Only an operating condition when an open operation is starting.

  3. SYSTEM CONTROL


    1. Open Function Operation

      B006KB5E01
      Timing Chart
      [T] Component Operation Outline
      Power back door switch or power back door button (electrical key transmitter sub-assembly) is pressed for approximately 0.8 seconds or more.
      (a) Power Back Door Control Switch or Power Back Door Button (Electrical Key Transmitter Sub-assembly) Turned on (Pressed for approximately 0.8 seconds) User operation is detected.
      (b) Power Back Door Warning Buzzer Intermittent sounding starts

      • When user operation is detected, sounds for approximately 0.8 seconds.

      • Sounds intermittently during an open operation (buzzer turns on for 0.4 seconds with a cycle of approximately 0.8 seconds).
      Back Door Closer Motor Changes from off to reverse When user operation is detected, the reverse rotation relay turns on and a reverse rotation operation starts.
      Hazard Warning Light Changes from off to on

      1. Power slide door main switch is on.

      2. Power back door is not operating.

      3. User operation is detected.

      When conditions 1, 2 and 3 listed above are met, a flash request signal is sent to the main body ECU (multiplex network body ECU).
      (c) Magnet Clutch Changes from off to on A connection to the power back door motor is made when the courtesy switch is detected to be on.
      Back Door Motor Changes from off to open operation

      1. Courtesy switch is detected to be on.

      2. Courtesy switch and latch switch are detected to be on.

      3. 1 or 2 listed above is not detected for approximately 1 second or more

      When any one of the 3 conditions listed above is met while the back door closer motor is performing a release operation, the open relay turns on and the back door motor operates in the open direction.
      (d) Back Door Closer Motor Changes from reverse to off When the latch switch is detected to be on, the reverse rotation relay turns off and the reverse rotation operation stops.
      (e) Back Door Closer Motor Changes from off to normal rotation

      1. After the latch switch is detected to be on, the pulse sensor detects a movement of 20 edges*1 in the open direction.

      2. Approximately 3 seconds or more have elapsed since the back door closer motor was detected to be off.

      When condition 1 or 2 listed above is met, the open relay turns off and operation stops.*2
      (f) Back Door Closer Motor Changes from normal rotation to off When the sector switch is detected to be on, the normal rotation relay turns off and the normal rotation operation stops.
      (g) Back Door Motor Changes from open operation to off

      1. The pulse sensor detects a movement of 15 edges*1 in the close direction from the fully open position.

      2. Back door motor open output is detected continuously for approximately 30 seconds or more.

      When condition 1 or 2 listed above is met, the open relay turns off and operation stops.*2
      Back Door Warning Buzzer Intermittent sounding stops When the back door motor is detected to be off, intermittent sounding stops.
      Magnet Clutch Changes from on to off The connection to the back door motor is released.

      *1: Pulse unit

      *2: After the back door motor stops, the back door is fully opened by the damper force of the back door stay assembly.


      1. Back Door Rapid Closing Prevention Control


        • Immediately after being fully opened by an open operation, if the back door cannot stay open and begins to close because of its own weight or other reasons, the door brake will be applied, reducing the door speed.

        • Approximately 3 seconds after the back door rapid closing prevention control starts, the power back door warning buzzer sounds continuously.

        • When any one of the following conditions is met (1 to 4), the power back door warning buzzer will stop sounding.


          • 1. Latch switch is off

          • 2. It is detected that the back door operation moving in the close direction has stopped.

          • 3. It is detected that the back door operation moving in the open direction has stopped.

          • 4. Approximately 30 seconds elapse after control starts.

    2. Close Function Operation

      B006KAJE01
      Timing Chart
      [T] Component Operation Outline
      Power back door control switch, power back door switch or power back door button (electrical key transmitter sub-assembly) is pressed.
      (a) Power Back Door Control Switch, Power Back Door Switch or Power Back Door Button (Electrical Key Transmitter Sub-assembly) Changes from off to on User operation is detected.
      (b) Power Back Door Warning Buzzer Intermittent sounding starts

      • When user operation is detected, sounds for approximately 0.8 seconds.

      • Sounds intermittently during an close operation (buzzer turns on for 0.4 seconds with a cycle of approximately 0.8 seconds).
      Magnet Clutch Changes from off to on A connection to the power back door motor is made.
      Back Door Motor Changes from off to close operation The close relay turns on and the back door motor starts operating in the close direction.
      Back Door Motor Changes from off to close operation

      1. Power slide door main switch is on.

      2. Power back door is not operating.

      3. User operation is detected.

      When conditions 1, 2 and 3 listed above are met, a flash request signal is sent to the main body ECU (multiplex network body ECU).

      The hazard warning lights flash 2 times under control from the main body ECU (multiplex network body ECU).
      (c) Power Back Door Warning Buzzer Intermittent sounding stops When the back door closer motor is detected to be performing a normal rotation operation, intermittent sounding stops.
      Back Door Closer Motor Changes from off to normal rotation Approximately 1 second after the latch switch is detected to be off, the normal rotation relay turns on and a normal rotation operation starts.
      (d) Back Door Closer Motor Changes from close operation to off

      Condition A: Courtesy switch is detected to be on.

      Condition B: Back door motor open output is detected continuously for approximately 30 seconds or more.

      Condition C: After the latch switch is detected to be off, the pulse sensor detects a movement of 2 edges* in the close direction.

      When any one of the conditions listed above from A to C is met, the close relay turns off and the operation stops.

      When condition C listed above is met and the close operation changes to off, output is reduced to secure the power needed to maintain the door position, and then after approximately 0.3 seconds, the output turns off.
      Magnet Clutch Changes from on to off

      1. Condition A or B of the back door motor (close operation changes to off) is met.

      2. Approximately 4 seconds have elapsed since condition C of the back door motor (close operation changes to off) was met.

      When condition 1 or 2 listed above is met, the connection to the back door motor is released.
      (e) Back Door Closer Motor Changes from normal rotation to off When the latch switch is detected to be on (the latch is within the overstroke range after fully closing), the normal rotation relay turns off and the normal rotation operation stops.
      (f) Back Door Closer Motor Changes from off to reverse rotation Approximately 0.1 seconds after the back door closer motor is detected to be off, the reverse rotation relay turns on and a reverse rotation operation starts in order to return the back door closer motor and sector gear to the initial position.
      (g) Back Door Closer Motor Changes from reverse rotation to off When the sector switch is detected to be on, the reverse rotation relay turns off and the reverse rotation operation stops.

      *: Pulse unit

    3. Reverse Function Operation


      • When the power back door ECU detects user operation during power back door operation, the ECU sounds the power back door warning buzzer for approximately 0.2 seconds and operates the back door motor in reverse until the back door reaches the fully open or fully closed position. Furthermore, when the back door opener switch assembly is pressed during power back door operation, the power back door warning buzzer sounds for approximately 2 seconds and operation switches to manual after the back door motor operation stops.


      1. Reverse operation immediately after open operation starts (reverse close operation prohibition range)

        B006K8ZE01
        Timing Chart
        [T] Component Operation Outline
        (a) Power Back Door Control Switch Changes from off to on User operation is detected.
        Power Back Door Button (Electrical Key Transmitter Sub-assembly) Changes from off to on
        Back Door Motor Open operation continues The open operation continues until the back door leaves the reverse close operation prohibition range.
        (b) Back Door Motor Changes from open operation to off When the back door leaves the reverse operation prohibition range with user operation detected, the open operation stops.
        Power Back Door Warning Buzzer Changes from off to on When the back door motor is detected to be off, the power back door warning buzzer sounds for approximately 0.2 seconds.
        (c) Back Door Motor Changes from off to close operation Approximately 0.1 seconds after the back door motor turns off, it starts operating in the close direction.

      2. Reverse operation during or directly before completion of open operation

        B006K0JE01
        Timing Chart
        [T] Component Operation Outline
        (a) Power Back Door Control Switch Changes from off to on User operation is detected.
        Power Back Door Button (Electrical Key Transmitter Sub-assembly) Changes from off to on
        Power Back Door Button (Electrical Key Transmitter Sub-assembly) Changes from off to on
        Back Door Motor Changes from open operation to off When user operation is detected, the open operation stops.
        Power Back Door Warning Buzzer Changes from off to on When the back door motor is detected to be off, the power back door warning buzzer sounds for approximately 0.2 seconds.
        (b) Back Door Motor Changes from off to close operation Approximately 0.1 seconds after the back door motor turns off, it starts operating in the close direction.

      3. Reverse operation immediately after close operation starts

        B006K0YE01
        Timing Chart
        [T] Component Operation Outline
        (a) Power Back Door Control Switch Changes from off to on User operation is detected.
        Power Back Door Switch Changes from off to on
        Power Back Door Button (Electrical Key Transmitter Sub-assembly) Changes from off to on
        Back Door Motor Changes from open operation to off When user operation is detected, the open operation stops.
        Power Back Door Warning Buzzer Changes from off to on When the back door motor is detected to be off, the power back door warning buzzer sounds for approximately 0.2 seconds.
        (b) Back Door Motor Changes from off to open operation Approximately 0.1 seconds after the back door motor turns off, it starts operating in the open direction.

      4. Reverse operation during close operation

        B006KBME01
        Timing Chart
        [T] Component Operation Outline
        (a) Power Back Door Control Switch Changes from off to on User operation is detected.
        Power Back Door Button (Electrical Key Transmitter Sub-assembly) Changes from off to on
        Back Door Motor Changes from close operation to off When user operation is detected, the close operation stops.
        Power Back Door Warning Buzzer Changes from off to on When the back door motor is detected to be off, the power back door warning buzzer sounds for approximately 0.2 seconds.
        Back Door Closer Motor Changes from off to reverse operation When user operation is detected, the reverse rotation relay turns on and a reverse rotation operation starts.
        (b) Back Door Motor Changes from off to open operation Approximately 0.1 seconds after the back door motor turns off, it starts operating in the open direction.

      5. Operation when back door opener switch assembly is pressed during open or close operation

        B006KD7E01
        Timing Chart
        [T] Component Operation Outline
        (a) Back Door Opener Switch Changes from off to on User operation is detected.
        Power Back Door Warning Buzzer Changes from off to on When user operation is detected, the power back door warning buzzer starts sounding.
        Magnet Clutch Changes from on to off The connection to the back door motor is released.
        Back Door Motor Changes from close operation to off When user operation is detected, the back door motor stops operating.*
        (b) Power Back Door Warning Buzzer Changes from on to off After approximately 2 seconds, the back door warning buzzer stops sounding.

        CAUTION:

        *: Switches to manual operation after the back door motor stops operating.

    4. Power Back Door Jam Protection Function Operation


      • When the power back door ECU detects that the back door is overloaded through the pulse sensor in the back door motor, or detects a jam through the power back door sensor assembly (only detected during a close operation), the power back door ECU reverses the operating direction.

      • When a jam is detected during an operation of the power back door in the close direction due to the power back door jam protection function, the power back door warning buzzer sounds for approximately 2 seconds, the power back door stops operating and the back door is completely released.


      1. Operation when a jam is detected during an open operation

        B006K6NE01
        Timing Chart
        [T] Component Operation Outline
        (a) Pulse Sensor Pulse width changes Detects a jam (overload).
        Back Door Motor Changes from open operation to off When a jam (overload) is detected, stops the open operation.
        Power Back Door Warning Buzzer Changes from off to on When a jam (overload) is detected, sounds 2 times for approximately 0.13 seconds each.
        (b) Back Door Motor Changes from off to close operation Starts operating in the close direction.

      2. Operation when a jam is detected and the power back door system is operated to perform a close operation

        B006JVKE01
        Timing Chart
        [T] Component Operation Outline
        (a) Power Back Door Sensor Changes from off to on Detects a jam.
        Power Back Door Warning Buzzer Changes from off to on When a jam is detected, sounds 2 times for approximately 0.13 seconds each.
        Back Door Motor Off Since a jam is detected, the back door motor does not operate.

      3. Operation when a jam is detected immediately after a close operation starts

        B006K62E01
        Timing Chart
        [T] Component Operation Outline
        (a) Pulse Sensor Pulse width changes Detects a jam (overload).
        Power Back Door Sensor Changes from off to on
        Power Back Door Warning Buzzer Changes from off to on When a jam is detected, sounds 2 times for approximately 0.13 seconds each.
        Back Door Motor Changes from close operation to off When a jam (overload) is detected, stops the close operation.
        (b) Back Door Motor Changes from off to close operation Approximately 0.1 seconds after a jam is detected, starts open operating.

      4. Operation when a jam is detected during a close operation

        B006K0TE01
        Timing Chart
        [T] Component Operation Outline
        (a) Pulse Sensor Pulse width changes Detects a jam (overload).
        Power Back Door Sensor Changes from off to on
        Power Back Door Warning Buzzer Changes from off to on When a jam is detected, sounds 2 times for approximately 0.13 seconds each.
        Back Door Motor Changes from close operation to off When a jam (overload) is detected, stops the close operation.
        Back Door Close Motor Changes from off to reverse rotation operation When a jam is detected, the back door closer motor performs a reverse rotation operation
        (b) Back Door Motor Changes from off to open operation Approximately 0.1 seconds after a jam is detected, starts open operating.

      5. Operation when a jam is detected directly before a close operation completes

        B006K2LE01
        Timing Chart
        [T] Component Operation Outline
        (a) Pulse Sensor Pulse width changes Detects a jam (overload).
        Power Back Door Sensor Changes from off to on
        Power Back Door Warning Buzzer Changes from off to on When a jam is detected, sounds 2 times for approximately 0.13 seconds each.
        Back Door Motor Changes from close operation to off When a jam (overload) is detected, stops the close operation.
        Back Door Close Motor Changes from off to normal rotation operation When a jam is detected, the back door closer motor performs a reverse rotation operation.
        (b) Back Door Close Motor Changes from off to reverse rotation operation Approximately 0.1 seconds after a jam is detected, starts reverse rotation operating.
        Back Door Motor Changes from off to open operation Approximately 0.1 seconds after a jam is detected, starts open operating.

      6. Operation when a jam is continuously detected in the close direction


        • When the power back door system is operated to perform a close operation


          1. A jam is detected during the close operation, and then an open operation is performed by the jam protection function.

          2. A jam is detected during the open operation performed by the jam protection function, and then a close operation is performed by the jam protection function.

          3. A jam is detected during the close operation performed by the jam protection function (2nd time), and then operation stops (fully released).

        • When the power back door system is operated to perform an open operation


          1. A jam is detected during the open operation, and then a close operation is performed by the jam protection function.

          2. A jam is detected during the close operation performed by the jam protection function, and then operation stops (fully released).

            B006JWZE01
            Timing Chart
            [T] Component Operation Outline
            (a) Pulse Sensor Pulse width changes A jam is detected during a close operation performed by the jam protection function.
            Power Back Door Sensor Changes from off to on
            Power Back Door Warning Buzzer Changes from off to on When a jam is detected during the close operation performed by the jam detection protection function, the power back door warning buzzer sounds for approximately 2 seconds.
            Back Door Motor Changes from close operation to off When a jam is detected during a close operation performed by the jam detection protection function, the back door motor stops operating.
            (b) Magnet Clutch Changes from on to off The connection to the back door motor is released.

        • When the power back door stops operating, the user can perform any one of the following procedures to restore operation.

          Component Manual Operation Back Door Operation
          Power Back Door Control Switch Changes from off to on After the back door is automatically operated to the fully open or fully closed position, operation is restored.*
          Power Back Door Switch Changes from off to on After the back door is automatically operated to the fully closed position, operation is restored.
          Power Back Door Button (Electrical Key Transmitter Sub-assembly) Changes from off to on After the back door is automatically operated to the fully open or fully closed position, operation is restored.*
          - The back door is manually operated until it reaches the fully open or fully closed position. After the back door is moved to the fully open or fully closed position, operation is restored.

          Tech Tips

          *: The operating direction will vary depending on the stopped position of the back door.

  4. FUNCTION

    Function Outline
    Open Function When the power back door ECU receives an on signal from the power back door switch, back door opener switch assembly or power back door button (electrical key transmitter sub-assembly)with the back door unlocked, the power back door ECU operates the back door closer motor and back door motor to release the back door latch and open the back door.
    Close Function When the power back door ECU receives an on signal from the power back door switch, the back door control switch with the back door open or the power back door button (electrical key transmitter sub-assembly), the power back door ECU operates the back door drive unit and back door closer motor to close the back door and back door lock latch.
    Reverse Function By operating either the power back door switch , back door control switch or power back door button (electrical key transmitter sub-assembly) during opener or closer function operation, this function reverses the operating direction of the door.
    Power Back Door Jam Protection Function When an overload occurs in the back door or a jam is detected during an automatic open or close operation, this function reverses the operating direction of the door.

  5. FAIL-SAFE


    1. When the power back door ECU detects a malfunction in parts such as a motor or sensor, the system enters fail-safe mode. Refer to the Repair Manual for details.