Description And Operation: Operation

Battery voltage is supplied to the power sliding door system through a fuse, located in the Power Distribution Center (PDC) assembly. With the push of a power sliding door open/close command switch (key fob, overhead console or B-pillar mounted) a signal is received by the Power Sliding Door Control Module (PSDM). The PSDM receives this signal via the Controller Area Network (CAN) Data Bus circuit. The PSDM then signals the power sliding door cinching latch to release the door to the unlatched and movable position. The power sliding door drive assembly motor then starts an open cycle.

The overhead power sliding door switch is mounted in the front overhead console of the vehicle. The switches are not serviced individually, they are part of a switch pod integral to the overhead console. The switch has resistors in parallel of 1.76K ohms, 3.17K ohms and 15K ohms. When pressed, the switch will have a nominal resistance of 1.76K ohms for the right sliding door button, 3.76K ohms for the left sliding door button and when not pressed, the switch will have a nominal resistance of 15K ohms.

The status of the overhead power sliding door switches is continually monitored by the circuitry within the Body Control Module (BCM). The BCM receives input messages from the overhead power sliding door switches over a Local Interface Network (LIN) line. Whenever the BCM receives an input from the overhead power sliding door switches it sends a function command signal to the selected PSDM. This message from the BCM to the PSDM is delivered via the Controller Area Network (CAN) data bus.

The B-pillar switch is located on the lower B-pillar trim panel and allows the rear occupants to power open or close the sliding doors. The B-pillar switch is an R-Mux switch that has a resistance of 3.6K ohms and 16K ohms depending on switch position. When pressed the B-pillar switch will have a nominal resistance of 3.9K.

The B-pillar switches are hardwired to the BCM. The PSDM receives the message for operation status via the Controller Area Network (CAN) data bus. If all the necessary conditions are met the PSDM will then perform the requested operation. The B-pillar switch lockout feature must be disabled and the sliding door must be unlocked in order for the B-pillar switch to function.

The key fobik switch sends a signal to the Remote Frequency Hub Module (RFHM). The PSDM receives the message from the RFHM for operation status via the Controller Area Network (CAN) data bus. If all the necessary conditions are met the PSDM will then perform the requested operation. The vehicles theft alarm must be disabled and the sliding door must be unlocked in order for the key fob switch to function.

When one of the PSDMs receives a command signal it checks the following:

• PRNDL Status
• Vehicle Speed Status
• Ignition Status
• Vehicle Theft Alarm Armed/Disarmed Status
• Sliding Door Latch Status
• Sliding Door Full Open Status
• Ambient Temperature
• Door Lock Status
• Sliding Door B-Pillar Switch Lockout Status
• Sliding Door Window Up/Down Status

Power close (only) in gear feature. The door can be power closed when the vehicle is out of Park or Neutral.

If the appropriate conditions exist the PSDM will send a command signal to the selected Rear Door Control Module (RDCM) so the sliding door can be latched/unlatched as needed. This command signal is sent via the CAN data bus. Once the PSDM senses the latch function it will power the motor on the power sliding door drive assembly to open/close the sliding door as requested by the overhead power sliding door switches.

During the door cycle, if the PSDM detects sufficient resistance to door travel, such as an obstruction in the door's path, it will immediately stop door movement and reverse door travel to the full open or closed position. The ability for the PSDM to detect resistance to door travel is accomplished by hall effect sensors detecting the door motor speed.

The PSDM has the ability to learn. Anytime a door is opened or closed using the power sliding door system the module learns from its cycle. If a replacement power sliding door component is installed or a door adjustment is made, the module must re-learn the effort required to open or close the door. A learn cycle can be performed with a complete cycle of the door, using any one of the command switches or with the use of a scan tool for detailed instructions. Refer to STANDARD PROCEDURE .

The power sliding door system is designed with a number of system inhibitors. These inhibitors are necessary for safety and/or feasibility of the power sliding door system. The power sliding door system inhibitors are:

• The power sliding door must be in the full  open or closed position in order for the power sliding door system to start a normal cycle. If the door is not in this position (based on the input from the switches integral to the cinching latch assembly) the PSDM will only perform a power open cycle.
• The transmission must be in park or neutral  in order for the power sliding door system to start a power open cycle. For power close cycle, the transmission can be out of park or neutral.
• The front overhead console lockout switch must be in the "UNLOCKED" position in order for the power sliding door systems B-pillar switches to function.
• If multiple obstacles are seen the clutch of the drive unit will stay engaged and the door held in that position until the following:
  • A 3 minute elapsed time and door will automatically try to power open.
  • If handle or other input is done before the 3 minute time elapses door will power open.
• If severe Diagnostic Trouble Codes (DTC) are stored in the PSDM the power sliding door may go into full manual mode.
• Due to the high pressure created in the passenger compartment with the blower motor on high, the power sliding door may not complete a power close cycle unless a window is cracked, allowing the pressure to escape. This situation will only be experienced on some vehicles, or vehicles with brand new side door weather seals installed.