Power Liftgate System

POWER LIFTGATE
Anyone of the following will activate the power liftgate (PLG) system: remote keyless entry (RKE), overhead console switches, outside liftgate handle switch, or the DRBIII(R). These inputs are hard-wired 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 Lift-gate Module (PLGM). The liftgate must be in the full open or full closed position to operate. Once the BCM sends a button activation message to the PLGM, the module shall read all inputs, outputs, and vehicle conditions to determine whether it shall open, close, or inhibit the PLG operation. Once the PLGM determines the vehicle conditions are safe for operation, the PLGM will initiate a chime for 2 seconds prior to the liftgate activation and 2 seconds during the open or close cycle.

During an opening or closing cycle, the PLG system's optical sensors, which are integrated into the drive unit, will detect the presence of obstacles. During an open cycle, multiple liftgate activations (RKE or overhead console switch) will reverse the liftgate to the full closed position. However, during a close cycle, a 2nd liftgate activation (RKE or overhead console switch) will reverse the liftgate to the full open position.

If the engine is cranked during a power open/ close, the PLG will pause, then resume after engine cranking. In addition, if the vehicle is placed in gear during an open cycle, the PLG shall reverse direction and begin closing. If the vehicle is placed in gear during a closing cycle, the PLG shall continue closing until fully closed. If the outside handle is activated during an open cycle, the PLG will become a full manual liftgate. If the outside handle is activated during a close cycle, the PLG shall reverse direction of travel to the full open position.

In the event of a complete power failure with the liftgate, it can be opened by removing the 25mm plug at the lower trim of the liftgate near the latch and using a screwdriver, trip the latch. See Service Information for a detailed explanation. This will work for the non-power liftgate also.

DIAGNOSTIC FEATURES
The PLGM can be flashed on vehicle via PCI Bus with a DRBIII(R) diagnostic tool. The DRBIII(R) 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 PLG operation.

SYSTEM INHIBITORS
1. Battery voltage too high or too low (above 16V, below 9.5V)
2. Vehicle in gear
3. Vehicle speed > 0 mph (0 km/h)
4. Outside temperature too high, above 179.6° F(82° C) or too low, below -22° F(-30° C).
5. Liftgate locked will inhibit the interior switch from opening (overhead console). A locked lift-gate can be power closed.
6. Pinch Sensor switch stuck shall inhibit the power close feature.