System Description

Fig.1 Power Sliding Door Introduction:

Fig.2 Key Fob:

POWER SLIDING DOOR SYSTEM
Some vehicles are equipped with a power opening and closing sliding door system. Depending on how the vehicle is ordered it may be equipped with only a right side power door or right and left side power doors. This power sliding door system is a complex system consisting of many components. Some of these components are the door motor, latch assembly, sliding door control module, lower drive unit, flex drive assembly, wire harness and track, lower drive unit track and rack assembly full open switch, B-pillar switch, overhead console switch, key fob switches, pawl switch, ratchet switch and child lockout and handle switches.

Each power side door has its own door control module, located in the center of the door behind the door trim panel. (Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/DOOR CONTROL MODULE - DESCRIPTION) The power side door motor is located in the front portion of the door, on the inner door panel sheet metal. The latch assembly is located in the rear of the power side door, near the body line. The lower drive unit is attached to the lower door hinge. The flex drive assembly connects the door motor to the lower drive unit. The wire harness and track and the lower drive unit track are visible with the door open in the lower door sill area. The power side door full open switch is located under the lower drive unit and is part of the hold open latch assembly. The pawl, ratchet, handle and child lockout switches are all located on the power side door latch assembly. The B-pillar switch, as it will be referred to, is an open and close command switch located on the vehicles interior body side B-pillar trim. The overhead console switch, is an open and close command switch located in the vehicle's overhead console. More detailed information can be found on these components later in this section.

Fig.3 Power Side Door Fuse Location:

Safety is of the utmost concern with the power sliding door system. Software technology has enabled the power sliding door control module 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 (while closing only). Battery voltage is supplied to the power sliding door system through a 40 amp fuse, located in the Intelligent Power Module (IPM) assembly. The child lockout switch prevents children from opening or actuating the power sliding door system when desired. 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, just like a standard manual sliding door.

The Power Sliding Door Control Module communicates on the J1850 PCI Data Bus Circuit. Therefore, the Power Sliding Door Control Module can generate and store its own diagnostic trouble codes (DTC). A diagnostic scan tool, such as the DRB III is used to read and diagnose these trouble codes. Refer to the Body Diagnostic Manual for a complete list of diagnostic routines.

NOTE: It may be possible to generate Sliding Door Diagnostic Trouble Codes during normal power sliding door operation. Refer to the Body Diagnostic Manual for a complete list of diagnostic routines.

For additional information, (Refer to ELECTRICAL/POWER DOORS - OPERATION). For a complete power sliding door system wiring schematic, refer to Wiring Diagrams. For power sliding door system operation instructions, refer to the vehicle owner manual.

WARNING: BE CERTAIN TO READ ALL WARNINGS AND CAUTIONS IN POWER SLIDING DOOR OPERATION BEFORE ATTEMPTING ANY SERVICE OF POWER SLIDING DOOR SYSTEM OR COMPONENTS.

With the push of a power sliding door open/close command switch (key fob, overhead console or B-pillar mounted) a signal is sent out to the Body Control Module (BCM). The BCM then sends a signal out on the PCI Data Bus circuit (J1850) to the power sliding door module. The power sliding door module then signals the power sliding door latch to release the door to the unlatched and movable position. The motor then starts an open cycle.

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

The power sliding door control module 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 Diagnostic Scan Tool, such as the DRB III, or with a complete cycle of the door, using any one of the command switches. Refer to Standard Procedures in this section for detailed instructions.

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. See the power sliding door system inhibitors noted below:

Power Sliding Door
The Power Sliding Door (PSD) system is activated through the use of the following:
- Remote Keyless Entry (RKE)
- overhead console switches
- B pillar switches
- DRB III scan tool

These inputs are hardwired to the Body Control Module (BCM) and can be monitored with a diagnostic tool. The BCM will send the message via PCI bus to the power sliding door module (PSDM). The sliding door must be in the full open or full closed position to operate. Once the BCM sends a button activation message to the PSDM, the module shall read all inputs, outputs and vehicle conditions to determine whether it shall open, close or inhibit the PSD operation. During an opening or closing cycle, the PSDM can detect an obstacle present should it meet sufficient resistance by the hall effect sensors (integrated in the drive motor).

During an open cycle, multiple door activations (RKE, overhead console, B pillar) are ignored until the door reaches the full open position. However, during a close cycle, a 2nd door activation (RKE, overhead console, B pillar) will reverse the door to the full open position.

If the engine is cranked during a power open/close the PSD will pause then resume after engine cranking. In addition, if the vehicle is placed in gear during an open cycle, the PSD shall reverse direction and begin closing. If the vehicle is placed in gear during a closing cycle, the PSD shall continue closing until fully closed.

If the inside or outside handle is activated during an open or close cycle, the PSD will become a full manual sliding door. When the child lockout switch is on or 'enabled", the B pillar switches are inhibited from opening a fully closed power sliding door. However, the B pillar switches are allowed to close a fully opened power sliding door.

There is only one part number for the power sliding door module (PSDM). The driver sliding door harness has an additional ground circuit which will identify it as the driver side. This eliminates the need for a left and a right side module.

Diagnostic Features
The PSDM can be flashed on vehicle via PCI bus with a DRB III diagnostic tool. The DRB III can read all inputs, actuate all outputs, read module information, and read diagnostic trouble codes. As a reminder, some DTC's can be set during normal PSD operation.

Power Sliding Door System Inhibitors
1. The power sliding door must be in the full open or closed position in order for the power sliding door system to start a cycle. If the door is not in this position (based on the input from the full open, pawl or ratchet switches), the Door Control Module will not respond to command switch inputs.
2. The vehicles transmission must be in Park or Neutral in order for the power sliding door system to start a cycle.
3. The vehicles child lockout switch must be in the "UNLOCKED" position in order for the power sliding door systems B-pillar switches to function.
4. If multiple obstacles are detected during the same power open or close cycle the power sliding door may go into full manual mode.
5. If severe Diagnostic Trouble Codes (DTC) are stored in the power sliding door control module the power sliding door may go into full manual mode.
6. 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. Refer to the Side Door Adjustment procedure in the Standard Procedures section of this group.
7. The vehicles fuel tank filler door must be in the closed position. Due to the sliding door interference with the open fuel tank filler door, mechanical linkage prevents the side door from opening and striking the fuel door.
8. The Power Sliding Door System will not function if battery voltage is too low (below 9.5 volts) or too high (above 16 volts).
9. The Power Sliding Door System will not function if vehicle speed is above 0 mph (0 km/h).