Power Liftgate System

POWER LIFTGATE SYSTEM
The power liftgate (PLG) system is activated through the use of the following: remote keyless entry (RKE), overhead console switches, outside liftgate handle switch or the DRBIII(R). 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 liftgate 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 PLGM can detect an obstacle present should it meet sufficient resistance by the hall effect sensors (integrated in the gear motor assembly GMA).

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

DIAGNOSTIC FEATURES
The PLG an 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 9.5 V
2. Vehicle in gear
3. Vehicle speed > 0 mph/km/h
4. Outside temperature too high, above 143 °F (62 °C) or too low, below -12 °F (-24 °C).
5. O/H console lockout will inhibit the B pillar switches only.
6. Liftgate locked will inhibit all interior switches from opeing (overhead console). A locked liftgate can e power closed.
7. Pinch Sensor switch stuck shall inhibit the power do e feature.