POWER BACK DOOR SYSTEM

FUNCTION OF MAIN COMPONENTS

The main components of the power back door system have the following functions:

Component		Function
Power Back Door Unit Assembly	Motor	Opens and closes the back door when actuated by the power back door ECU.
Power Back Door Unit Assembly	Hall IC	Detects the operation conditions of the back door and outputs a pulse signal to the power back door ECU.
Power Back Door ECU (Multiplex Network Door ECU)		Controls the power back door system in accordance with the signals received from the switches, sensors and ECUs. Receives the signals from the Hall IC to detect the back door position and the opening and closing speed of the back door. Informs the user by sounding the buzzer and flashing the hazard warning light when each operation switch is pressed.
Back Door with Closer Lock Assembly	Back Door Lock Motor	Latches and unlatches the back door when actuated by the power back door ECU.
	Half-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. This switch turns on when the driven gear is in the neutral position and turns off when the driven gear is in any position other than neutral.
	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.
Door Control Switch Assembly		When the back door is open, the back door closing operation is performed by pressing the door control switch assembly. By pressing the door control switch assembly during the back door opening or closing operation, the back door operates in the opposite direction.
Back Door Opener Switch Assembly		The back door opens when the back door opener switch assembly on the outside of the vehicle is turned on (operated).
PWR DOOR OFF Switch (Power Back Door Main Switch)		Setting this switch prohibits system operation.
Touch Sensor (Power Back Door Sensor Assembly)		Detects if an object is jammed in the back door during the closing operation of the back door.
Back Door Buzzer and Wireless Door Lock Buzzer		When the power back door system starts to operate, the back door buzzer and wireless door lock buzzer sound to inform the user that the system is operating.
Combination Meter Assembly		Receives a hazard warning light blinking signal to blink the hazard warning light.
Door Control Receiver		Receives the power back door button signal and transmits it to the certification ECU1 or main body ECU2.
Main Body ECU (Multiplex Network Body ECU)		Transmits a back door lock/unlock control signal, vehicle speed signal and shift position P signal to the power back door ECU via the Controller Area Network (CAN).
Electrical Key Transmitter Sub-assembly		Transmits the power back door button signal to the door control receiver.

*1: Models with entry and start system
*2: Models without entry and start system

SYSTEM CONTROL

The power back door system has the following functions:

Function	Outline
Opener Function	Upon receiving an on signal from the back door control switch or the power back door button with the back door unlocked, the power back door ECU actuates the back door lock motor and the power back door unit assembly in order to release the latch of the back door and open the back door.
Closer Function	Upon receiving an on signal from the back door control switch, the door control switch assembly with the back door open or the power back door button, the power back door ECU actuates the power back door unit assembly 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 unit assembly, the power back door ECU detects that an object is jammed in the back door, and the door operation is stopped after moving back a certain distance upward during the closing operation and suspended during the opening operation. The back door buzzer sounds twice when a jammed object is detected. After the back door operation is canceled by the jam protection function, the back door can be operated by pressing the back door control switch or the power back door button on the electrical key transmitter sub-assembly.
Back Door Open/Close Speed Control Function	In accordance with the signals received from the Hall ICs, the power back door ECU performs control so as to make the opening and closing speed of the back door even.
Suspending Control Function	By conducting any of the following operations during the opening or closing operation of the power back door, the operation will be canceled: The power door off switch is turned off. The power back door button on the electrical key transmitter sub-assembly is pressed. The back door control switch is pressed. The back door opener switch assembly is pressed. The door control switch is pressed.
Memory Function	By pressing the back door close switch for 2.8 seconds while holding the back door at the desired back door opening angle by the hand, the back door buzzer sounds 4 times as an answer back and the power back door ECU memorizes the angle. From the next time the back door is opened, the back door will stop at the set angle. By pressing the back door close switch for 7 seconds after the set angle is memorized, the memorized position is initialized.
Assist Function	When the back door is stopped and then manually operated in the closing direction, the power back door ECU drives the power back door unit assembly to operate the back door until it is fully closed.
Switch Operation Function	When each operation switch is operated, the following operations are performed in accordance with the back door condition: When the power back door button on the back door control switch or the electrical key transmitter sub-assembly is pressed, opening operation is performed when the back door is closed and the closing operation is performed when the back door is open. When the back door opener switch assembly is pressed, the opening operation of the back door is performed. When the door control switch assembly is pressed, the closing operation of the back door is performed.

Tech Tips

If power supply is stopped such as when the battery terminals are removed, initialization is required. The back door should be fully closed with power being supplied for initialization.

Opener Function 1

When the back door control switch or the power back door button of the electrical key transmitter sub-assembly is operated, the opener function operates as follows:

1	After the back door control switch or the power back door button of the electrical key transmitter sub-assembly is pressed for approximately 0.8 seconds, the back door buzzer sounds for 0.8 seconds and the hazard warning light blinks twice.
2	The back door with closer lock assembly releases the latch.
3	The back door courtesy switch is turned on and the motor in the power back door unit assembly starts to operate.
4	The back door buzzer intermittently sounds while the back door is operating*, the back door lock motor is returned to the initial position and the half-latch switch is turned on.
5	After the power back door ECU detects a back door stop position pulse, the motor in the power back door unit assembly is stopped.

*: Except models for Europe

Opener Function 2

When the back door opener switch assembly is operated, the opener function operates as follows:

1	When the back door opener switch assembly is pressed, the back door buzzer sounds for 0.8 seconds and the hazard warning light blinks twice.
2	After the back door buzzer sounds, the back door with closer lock assembly releases the latch.
3	When the back door opener switch assembly is not input again before the latch begins to be released, the motor in the power back door unit assembly starts to operate when the back door courtesy switch is turned on.
4	The back door buzzer intermittently sounds while the back door is operating*, the back door lock motor is returned to the initial position and the half-latch switch is turned on.
5	After the power back door ECU detects a back door stop position pulse, the motor in the power back door unit assembly is stopped.

*: Except models for Europe

Closer Function 1

When the back door control switch or the power back door button of the electrical key transmitter sub-assembly is operated, the closer function operates as follows:

1	After the back door control switch or the power back door button of the electrical key transmitter sub-assembly is pressed for approximately 0.8 seconds, the back door buzzer sounds for 0.8 seconds and the hazard warning light blinks twice.
2	The motor in the power back door unit assembly begins to operate.
3	When the half-latch switch is turned off, the voltage of the motor is reduced.
4	The back door lock motor performs the closing operation 1.0 second after the half-latch switch is turned off, and stops the operation when the back door courtesy switch is turned off.

Closer Function 2

When the door control switch assembly is operated, the closer function operates as follows:

1	When the door control switch assembly is turned on, the back door buzzer sounds for 0.8 seconds and the hazard warning light blinks twice.
2	The motor in the power back door unit assembly starts to operate.
3	When the half-latch switch is turned off, the voltage of the motor is reduced.
4	The back door lock motor performs the closing operation 1.0 second after the half-latch switch is turned off, and stops the operation when the back door courtesy switch is turned off.