Power Sliding Door
Power Sliding Door
Description
Some vehicles are equipped with a power sliding door system. The components of the power sliding door system are:
• Power sliding door drive assembly.
• Power sliding door control module.
• Totally integrated power module.
• Electromechanical instrument cluster, also known as the cabin compartment node.
• Read door control modules.
• Wireless communication module.
• Next generation controller.
• Sliding door wire harness and chain link track (contains the wiring harness that connects the door electrical to the body electrical).
• Controller area network data bus.
• B-pillar switches.
• Overhead console switches.
• Key fob switches.
• Power sliding door cinching latches (includes the latch ratchet primary (ajar) switch, sector gear switch, pawl switch, handle switch and cinch/release motor).
Each power sliding door is equipped with a power sliding door drive with PSDM. The drive is mounted to the body in the lower sliding door sill area with the use of five nuts. The PSDM is mounted directly to the inboard side of the drive with two screws. The power sliding door motor is also located on the inboard side of the drive. Unlike the PSDM which can be serviced separately, the motor is not available as a service item and must be replaced with the drive, should it become damaged or inoperative. The wire harness and chain link track and the power sliding door drive are visible with the door open in the lower door sill area.
The cinching latchy is located in the rear of the power sliding door, near the body line. The latch has integral components (latch ratchet primary (ajar) switch, sector gear switch pawl switch, handle switch and cinch/release motor) that are responsible for the cinching and latching of the sliding door to the body striker. In addition the latch components also send status messages back to the PSDM via the RDCM and CAN data bus circuit.
The B-pillar switch is located on the lower B-pillar trim panel and allows the rear occupants to 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 overhead power sliding door switch is mounted in the front overhead console of the vehicle. 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.
Software technology has enabled the PSDM to detect resistance to door travel. This allows the power sliding door to stop and reverse direction any time an obstruction is felt or any of the command switches are operated. Battery voltage is supplied to the power sliding door system through a 40 amp fuse, located in the TIPM. The power sliding door lockout switch located in the front overhead console prevents opening or actuation of the power sliding door system when activated. In the unlikely event that the power sliding door system develops a fault, the power sliding door can still be operated manually from the interior or exterior door handle similar to a standard manual sliding door.
The PSDM communicates on the CAN data bus circuit. Therefore, the PSDM can generate and store its own diagnostic trouble codes. The hard wired circuits for the power sliding door system may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information. However, conventional diagnostic methods will not prove conclusive in the diagnosis of the electronic controls and communication between other modules and devices that provide some features of the power sliding door system. The most reliable, efficient, and accurate means to diagnose the switches, modules, data bus or the electronic controls and communication related to the power sliding door system operation requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic information.
• It may be possible to generate sliding door diagnostic trouble codes during normal power sliding door operation. Refer to the appropriate power sliding door diagnostic information for a complete list of diagnostic routines.
Be certain to read all warnings and cautions in power sliding door operation before attempting any service of the power sliding door system or components.
Operation
Battery voltage is supplied to the power sliding door system through a 40 amp fuse, located in the TIPM. 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 PSDM. The PSDM receives this signal via the 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 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 EMIC, also known as the CCN. The instrument cluster receives input messages from the overhead power sliding door switches over a hard wired connection. Whenever the instrument cluster receives an input from the overhead power sliding door switches it sends a function command signal to the selected PSDM. This message from the cluster to the PSDM is delivered via the 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 hard wired to the TIPM. The PSDM receives the message for operation status via the 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 fob switch sends a signal to the WCM. The PSDM receives the message from the WCM for operation status via the 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.
When the doors are unlocked, pull on the handle once to engage the power door. Pull on the handle again during power door travel, and the door stops and goes into manual mode. The switch for this operation is part of the latch.
If the appropriate conditions exist the PSDM will send a command signal to the selected 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 relearn 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. Refer to => [ Power Sliding Door Learn Cycle ] Testing and Inspection.
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 cycle.
• 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 detected during the same power open or close cycle the power sliding door may go into full manual mode.
• If severe DTC's 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.
The hard wired circuits for the power sliding door switches may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information. However, conventional diagnostic methods will not prove conclusive in the diagnosis of the electronic controls and communication between other modules and devices that provide some features of the power sliding door system. The most reliable, efficient, and accurate means to diagnose the power sliding door switches or the electronic controls and communication related to the power sliding door system operation requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic information.