Sliding Door: Description and Operation

POWER SLIDING DOOR

PRINCIPLES OF OPERATION

The left and right power sliding door systems each have their own PSD module and operate independently. Each PSD module has specific outputs to control the appropriate power sliding door operation. The control switches, SJB park input, SJB vehicle speed input and SJB remote keyless entry (RKE) signal inputs are specific for each PSD module. The SJB park input is a ground supplied by the SJB when the vehicle is in PARK. The SJB vehicle speed input is also a ground supplied by the SJB when vehicle speed is below 5 km/h (3 mph). Both the SJB park input and the SJB vehicle speed input are required for power open operation. The overhead console on/off switch disables the B-pillar switches and the power assist operation (operation from the interior and exterior door handles and from manual movement).

Power and Ground Requirements
The power requirements for the PSD are two battery supply circuits to each PSD. The SJB fuse 11 (5A) supplies battery logic power required for the software and internal switching operations for both the PSDs. The LPSD motor, clutch and latch release actuator power is supplied by BEC fuse 16 (30A). The RPSD motor, clutch and latch release actuator power is supplied by BEC fuse 5 (30A).

Ground for the PSD is a separate single connection for each module. Some of the continuous inputs which are at a ground state when ON are also used for logic switching.

The ignition switch source is from the SJB fuse 13 (5A) for both PSDs.The ignition power is used for diagnostic functions.

Power Sliding Door (PSD) Detent Switch
The PSD detent switch identifies the rear power sliding door latch position by sending a momentary ground signal to the PSD. The PSD detent switch circuit is connected through the sliding door contacts. The PSD can only read PSD detent switch status with the sliding door contacts touching. The PSD detent switch input to the PSD is:
- an open circuit with the power sliding door closed.
- momentarily grounded when rear power sliding door latch releases.
- an open circuit when the power sliding door is opening or closing and the sliding door contacts are not touching.
- is grounded just prior to secondary latch position (power sliding door is partially latched), then is open when secondary latch position is reached.
- is grounded just prior to primary latch position (power sliding door is fully latched), then is open when primary latch position is reached.
- an open circuit as power sliding door is pulled to complete close and latch.

Latch Release Actuator
Power is supplied to the release actuator by the PSD when a valid open command is received. The actuator unlatches the PSD similar to manual activation of a door handle. The release actuator is energized to release the latch until the sliding door contacts are separated. The PSD is unable to detect if the PSD is unlocked. If the PSD is activated with the PSD locked, the latch release actuator will operate, but the PSD will not open.

Position Sensor
The PSD supplies a five-volt reference voltage to the position sensor on a valid open command or anytime the PSD is in the open position up to 6 hours. The PSD constantly supplies the ground. The position sensor has two data lines that the PSD reads and tracks to determine the PSD movement and position. The PSD position is tracked so the power sliding door may be powered in the correct direction when a valid operation command is received. The velocity is tracked to identify obstructions and reverse the power sliding door operation if required.

Drive Assembly Actuator Clutch
The drive assembly actuator clutch separates the drive assembly actuator motor from the cable spool. This allows manual opening and closing of the PSD without driving the motor. The PSD supplies power to the drive assembly actuator clutch for any valid operation command. The clutch connects the drive assembly actuator motor to the cable spool, allowing the motor to turn the spool and open or close the PSD.

Drive Assembly Actuator Motor
The drive assembly actuator motor is a reversible pulse width modulated motor. Upon a valid activation, the PSD supplies power and ground to the motor circuits depending on the PSD position and the direction the PSD needs to be moved.

Overhead Console On/Off Switch
The overhead console on/off switch enables or disables the B-pillar switch activation and power assist activation of the PSD. Both functions are enabled when the PSD detects ground on the on/off switch circuit. With the overhead console on/off switch in the ON position:
- a ground signal is supplied to the PSD.
- the B-pillar switches are enabled.
- power assist is enabled.

The overhead switch has an ignition feed through the SJB fuse 16 (5A). With the ignition in RUN and the on/off switch in the ON position, the LED next to the switch will illuminate. With the overhead console on/off switch in the OFF position, the ground is removed and the B-pillar switches and power assist will not operate. The ground for the overhead console switch assembly is shared by the overhead console open/close switches.

Overhead Console Open/Close Switch
Pressing the overhead console PSD open/close switch supplies a momentary ground signal to the SJB which then unlocks the PSD if fully closed and then sends a signal to the corresponding PSD to open or close depending on the conditions. The overhead console on/off switch does not affect the overhead console open/close switch.

B-Pillar Open/Close Switch
Pressing the B-pillar switch supplies a momentary ground signal to the corresponding PSD. Upon receiving the input, the PSD checks the overhead console on/off switch circuit for ground. If the circuit is at ground, the PSD will open or close the power sliding door, if conditions are correct. If the on/off circuit is not at ground, the PSD will ignore the input.

Remote Keyless Entry Operation
The smart junction box (SJB) receives a PSD activation command from the remote keyless entry transmitter. The SJB will unlock the PSD only if the door is closed and then ground the open/close circuit to the appropriate PSD. The remote keyless entry activation supplies a momentary ground signal to the appropriate PSD commanding the PSD to carry out an open or close operation, if conditions are correct. The signal and data transmitted between the SJB and the PSDs is not specific to open or close operation. The PSD will determine which operation to carry out depending on the PSD position when the signal is received.

SJB Interface
PSD open operation requires the vehicle to be in PARK and the vehicle speed to be less than 5 km/h (3 mph). SJB receives information over the J1850 network from the powertrain control module (PCM) for the PRNDL position and the anti-lock brake system/traction control module (ABS/TC) for the vehicle speed.

If the vehicle is in PARK, the SJB will ground the PARK (enable) circuit to the PSDs. If the vehicle speed is less than 5 km/h (3 mph), the SJB will ground the vehicle speed circuit to the PSDs. As long as these two circuits are at ground, normal PSD open operation can be carried out.

The SJB will prevent PSD open operation if either of these inputs are not grounded. These two inputs to the SJB have network DTCs. If either of these DTCs are retrieved and the PSD is not operating, repair these DTCs first.

Power Sliding Door Operation
The following is a brief explanation of a normal power open cycle of the PSD.
- To begin the power open operation, the PSD receives a momentary ground signal from the overhead console switch, RKE or the B-pillar switch. The PSD may also have been manually released with the interior or exterior sliding door handle.
- The PSD checks the PARK and vehicle speed circuits from the SJB for ground.
- For the left PSD only, the PSD checks the fuel filler door switch circuit for ground.
- The PSD supplies power to the latch release actuator through the sliding door contacts which releases the PSD latch. Also, a five-volt reference is supplied to the position sensor.
- The PSD detent switch circuit is monitored for a momentary ground contact signaling the rear latch is released. This circuit is monitored through the sliding door contacts and will open when the contacts separate.
- When the PSD is opening, the position sensor is monitored for the door position and velocity. If an obstruction is detected, the door will stop or reverse depending on the conditions.
- When a momentary PSD detent switch ground is detected by the PSD, power is supplied to the drive assembly actuator clutch and motor, opening the PSD.
- As the PSD is opened, the position sensor is used to track the PSD movement and position.
- The PSD fully open position is learned by the PSD during the PSD initialization. When the PSD reaches the full open position, the PSD removes the power from the drive assembly actuator motor and clutch.

The following is a brief explanation of a normal power close cycle of the PSD.
- When the PSD receives a close signal, power is supplied to the drive assembly actuator clutch and motor.
- As the PSD is powered closed, the position sensor is monitored for door position and velocity. The PSD will react if any obstruction is detected.
- When the PSD contacts make contact, the PSD will then monitor the PSD detent switch position.
- The PSD detent switch circuit is monitored through the sliding door contacts for momentary ground signals.
- Just prior to the secondary latch position (power sliding door is partially latched), the PSD detent switch circuit is grounded. Once the PSD is in the secondary latch position, the PSD detent switch circuit is open.
- When the PSD receives this first detent switch signal, full power is supplied to the drive assembly actuator motor to completely close and latch the PSD.
- Just prior to the primary latch position (power sliding door is fully latched), the PSD detent switch circuit is grounded again. Once the PSD is in the primary latch position, the PSD detent switch circuit is open.
- When the PSD receives this second PSD detent switch signal, power is removed from the drive assembly actuator clutch and motor.