Power Liftgate System: Description: Notes

Some vehicles are equipped with an automatic opening and closing power liftgate. The power liftgate system is a complex system consisting of many components. Refer to the following list for component reference:

Drive Unit Components

Liftgate Motor
Clutch
Channel, Bracket, Rack and Yoke Assembly
Full Open Switch
Optical Sensor
Link Rod

Power Liftgate System Components

Power Latch and Actuator
Liftgate Power Module
Pinch Sensor
Overhead Console and Key Fob Command Switches
Chime/Thermistor Assembly

The power liftgate system utilizes its own liftgate control module. This power liftgate module contains all the solid state hardware and software used to control the power liftgate system. For specific component information refer to the individual component descriptions later in this article.

Safety is of the utmost concern with the power liftgate system. Software technology has enabled the power liftgate module to detect resistance to liftgate travel. This allows the power liftgate module to control liftgate direction anytime an obstruction is detected. The power liftgate can be operated manually using the liftgate outside handle switch.

The power liftgate module communicates on the Programmable Communication Interface (PCI) Bus Circuit. Therefore, the power liftgate module can generate and store its own Diagnostic Trouble Codes (DTC's). The Body Control Module (BCM) sends and receives messages to the power liftgate control module via the PCI bus circuit. A diagnostic scan tool, such as the DRB III® is used to read and troubleshoot these Diagnostic Trouble Codes. Refer to BODY DIAGNOSTIC PROCEDURES for a list of diagnostic procedures.

For a complete wiring schematic of the power liftgate system, refer to SYSTEM WIRING DIAGRAMS . For system operation instructions refer to the vehicles owner manual. Refer to INTERIOR/EXTERIOR for additional information on liftgate components such as the prop rods, hinges, door alignment and striker alignment.

The power liftgate system is designed with a number of system inhibitors. These inhibitors are necessary for safety and/or feasibility of the power liftgate system. Refer to POWER LIFTGATE SYSTEM INHIBITORS noted below: