Power Liftgate System Controls

WARNING: This page is about a different car, the 2013 GMC Acadia, 2013 Chevrolet Traverse, and 2013 Buick Enclave. However, it is still accessible from the selected car via links, so may be relevant.

The power liftgate can be operated by any one of the following means:

A keyless entry transmitter - open and close
The liftgate handle switch - release only
The liftgate close switch - close only

When approaching the vehicle, the power liftgate can be opened using a keyless entry transmitter. When the liftgate module sees the serial data message that a release is requested, it begins the open sequence. In this open sequence, the liftgate latch is released, allowing the liftgate motor assembly to begin raising the liftgate. Using the exterior liftgate handle to access the vehicle will only cause the liftgate latch to release; the liftgate motor will not open the liftgate in this instance. When open, the liftgate can be closed by either a keyless entry transmitter or the liftgate close switch. When a GMLAN serial data message or switch input is seen, the liftgate module begins the close sequence. The liftgate motor is reversed, lowering the liftgate until it latches into the liftgate latch. Once latched, the latch will cinch the liftgate to a fully closed position.

Power liftgate function will only be allowed if certain operating criteria are met. Any of the following may cause the power liftgate not to function:

Vehicle is not in park.
Engine cranking is present.
Temperature limits have been exceeded.
Liftgate motor overcurrent is detected.
Excessive hall effect counts are seen.
System voltage is out of range.
A DTC is set that disables power liftgate functionality.

The liftgate also receives inputs from 2 object detection sensors. If either of these sensors indicate an object is in the path of the liftgate, liftgate functions will be suspended until the object is removed.