Automatic Back Door System

AUTOMATIC BACK DOOR SYSTEM


Schematic










AUTOMATIC BACK DOOR SYSTEM


System Description


NOTE:
The automatic back door system must be initialized by fully closing the back door anytime the battery or the back door control unit has been disconnected.
The automatic back door system consists of a one piece unit that combines the back door control unit along with the back door motor, back door clutch and the back door encoder. The back door latch contains a lock function that can control the two functions of automatic back door latch closure and electrical opener with a single motor when the back door is closed to the halfway state.
- Back door auto closure
When the back door is closed to the half-way state (half-latch) position, the motor drives to rotate the latch lever and pull it in from half latched to full latched and automatically close the door.
- Power back door
With the back door closed, press the automatic door main switch or press the remote keyless entry button, or pull the back door handle with the back door unlocked, the back door latch motor drives the open the locking plate and releases the latch. The back door motor then raises the door to the full open position.
With the back door open, press the automatic door main switch, keyfob button or the back door close switch, the back door motor closes the door to the half-latch state. The back door latch motor then drives the latch to the full close position.
On an open or close signal, the hazard lamps will flash 3 times and the warning chime will sound 3 dings lasting a total of 2 seconds.

OPERATION DESCRIPTION

Automatic Door Main Switch Operation (Fully Closed to Fully Open Operation)
- When the automatic door main switch is pressed, back door control unit terminal 23 receives the signal.
- The back door control unit checks the automatic transaxle select lever (A/T device) position through terminal 18, vehicle speed through terminal 21 and battery voltage.
- When the back door control unit receives the signal, if the auto back door operating enable conditions are met, it sends a signal through terminal 6 and grounds terminal 9 to sound the warning chime, sends a signal to the BCM through terminal 4 to flash the hazard lamps and sends the unlock signal to the back door latch.
- When the back door latch receives the signal, it supplies voltage from terminal 12 to operate the release actuator and releases the door lock.
- The back door control unit supplies power to the magnetic clutch and the back door motor and moves the back door in the open direction. (At this time, it also executes speed control, input reverse, and overload reverse control.)
- When the back door is opened to the full-open position, the full-open position is detected by the encoder, and the back door control unit switches the back door motor OFF and the magnetic clutch is pulsed and then turned OFF.
- The back door is held in the fully open position by the gas stays.

Remote Keyless Entry Operation (Fully Closed to Fully Open Operation)
- When the keyfob button is pressed for at least 0.5 seconds, back door control unit terminal 21 receives the signal.
- The back door control unit checks the automatic transaxle select lever (A/T device) position through terminal 18, vehicle speed through terminal 21 and battery voltage.
- When the back door control unit receives the signal, if the auto back door operating enable conditions are met, it sends a signal through terminal 6 and grounds terminal 9 to sound the warning chime, sends a signal to the BCM through terminal 4 to flash the hazard lamps and sends the unlock signal to the back door latch.
- When the back door latch receives the signal, it supplies voltage from terminal 12 to operate the release actuator and releases the door lock.
- The back door control unit supplies power to the magnetic clutch and the back door motor and moves the back door in the open direction. (At this time, it also executes speed control, input reverse, and overload reverse control.)
- When the back door is opened to the full-open position, the full-open position is detected by the encoder, and the back door control unit switches the back door motor OFF and the magnetic clutch is pulsed and then turned OFF.
- The back door is held in the fully open position by the gas stays.

Back Door Handle Switch Operation (Fully Closed to Fully Open Operation)
- When the back door is unlocked and the back door handle is pulled, back door control unit terminal 26 receives the signal.
- The back door control unit checks the automatic transaxle select lever (A/T device) position through terminal 18, vehicle speed through terminal 21 and battery voltage and automatic door main switch position through terminal 13.
- When the back door control unit receives the signal, if the auto back door operating enable conditions are met, it sends a signal through terminal 6 and grounds terminal 9 to sound the warning chime, sends a signal to the BCM through terminal 4 to flash the hazard lamps and sends the unlock signal to the back door latch.
- When the back door latch receives the signal, it supplies voltage from terminal 12 to operate the release actuator and releases the door lock.
- The back door control unit supplies power to the magnetic clutch and the back door motor and moves the back door in the open direction. (At this time, it also executes speed control, input reverse, and overload reverse control.)
- When the back door is opened to the full-open position, the full-open position is detected by the encoder, and the back door control unit switches the back door motor OFF and the magnetic clutch is pulsed and then turned OFF.
- The back door is held in the fully open position by the gas stays.

Automatic Door Main Switch Operation (Fully Open to Fully Closed Operation)
- When the automatic door main switch is pressed, the back door control unit terminal 23 receives the signal.
- The back door control units checks battery voltage.
- When the back door control unit receives the signal, if the auto back door operating enable conditions are met, it sends a signal through terminal 6 and grounds terminal 9 to sound the warning chime and sends a signal to the BCM through terminal 4 to flash the hazard lamps.
- The back door control unit supplies power to the magnetic clutch and the back door motor and move the back door in the close direction. (At this time, it also executes speed control, input reverse, and overload reverse control.)
- When the back door reaches the half-latch state, the half-latch switch detects this and the signal is sent to the back door control unit terminal 22.
- When the back door control unit receives the signal, it switches OFF the back door motor and the magnetic clutch.
- When the cinch latch motor operates and the close switch detects this, the back door control unit terminal 14 receives the signal from back door latch terminal 5.
- When the back door latch operates and full close is detected through terminal 14 of the back door control unit, the back door auto closure operation ends and the door is fully closed.

Remote Keyless Entry Operation (Fully Open to Fully Closed Operation)
- When the keyfob button is pressed for at least 0.5 seconds, the back door control unit terminal 21 receives the signal.
- The back door control units checks battery voltage.
- When the back door control unit receives the signal, if the auto back door operating enable conditions are met, it sends a signal through terminal 6 and grounds terminal 9 to sound the warning chime and sends a signal to the BCM through terminal 4 to flash the hazard lamps.
- The back door control unit supplies power to the magnetic clutch and the back door motor and move the back door in the close direction. (At this time, it also executes speed control, input reverse, and overload reverse control.)
- When the back door reaches the half-latch state, the half-latch switch detects this and the signal is sent to the back door control unit terminal 22.
- When the back door control unit receives the signal, it switches OFF the back door motor and the magnetic clutch.
- When the cinch latch motor operates and the close switch detects this, the back door control unit terminal 14 receives the signal from back door latch terminal 5.
- When the back door latch operates and full close is detected through terminal 14 of the back door control unit, the back door auto closure operation ends and the door is fully closed.

Back Door Close Switch Operation (Fully Open to Fully Closed Operation)
- When the back door close switch is pressed with the automatic main door switch ON, the back door control unit terminal 8 receives the signal.
- The back door control units checks battery voltage.
- When the back door control unit receives the signal, if the auto back door operating enable conditions are met, it sends a signal through terminal 6 and grounds terminal 9 to sound the warning chime and sends a signal to the BCM through terminal 4 to flash the hazard lamps.
- The back door control unit supplies power to the magnetic clutch and the back door motor and move the back door in the close direction. (At this time, it also executes speed control, input reverse, and overload reverse control.)
- When the back door reaches the half-latch state, the half-latch switch detects this and the signal is sent to the back door control unit terminal 22.
- When the back door control unit receives the signal, it switches OFF the back door motor and the magnetic clutch.
- When the cinch latch motor operates and the close switch detects this, the back door control unit terminal 14 receives the signal from back door latch terminal 5.
- When the back door latch operates and full close is detected through terminal 14 of the back door control unit, the back door auto closure operation ends and the door is fully closed.

Reverse Function
The door will reverse direction during power open or close operation if the automatic door main switch, keyfob or back door close switch is operated. A chime will sound to announce the reversal.

Anti-Pinch Function
- During auto operation, if an object is detected in the door's path, a warning chime sounds and the back door operates in the reverse direction to prevent pinching.
- During auto close operation, if an object is detected by the pinch strips in the door's path, a warning chime sounds and the back door operates in the open direction until it is fully open.

Gas Stay Check
- During each power open operation, the back door control unit monitors motor current draw to determine if the gas stays are functioning properly.
- If a malfunction of the gas stays is detected, the back door control unit will close the back door while sounding the warning chime. The back door cannot be opened using the switches until the gas malfunction is repaired.

Warning Functions
- The hazard warning lamps flash and a warning chime is sounded according to the back door operating state, operations, and conditions.

Auto Back Door Operation Enable Conditions






Control When Handle Pulled When Operating Enable Conditions Not Yet Met






Control When Operating Enable Conditions No Longer Met






Warning Chime Active Conditions
The warning chime uses two types of audio warnings, a friendly chime and a warning chime. The friendly chime consists of dings lasting 0.66 seconds each immediately followed by the next ding. The warning chime consists of beeps lasting 0.33 seconds with a pause of 0.33 seconds between each beep.






Reverse Conditions