2012 GMC Acadia Owner's Manual - Page 41

Keys, Doors, and Windows Power Liftgate On vehicles with a power liftgate, the vehicle must be in P (Park) to operate. The taillamps flash and a chime sounds when the power liftgate moves. 2-11 { WARNING You or others could be injured if caught in the path of the power liftgate. Make sure there is no one in the way of the liftgate as it is opening and closing. The power liftgate can be power opened and closed in the following ways: ... Press O. Power Liftgate Touch Pad The liftgate can also be closed by pressing l next to the liftgate latch. Press l a second time during the liftgate operation to reverse the operation. The power liftgate may be temporarily disabled under extreme temperatures or under low battery conditions. If this occurs, the liftgate can be operated manually. If the vehicle is shifted out of P (Park) while the liftgate power function is in progress, it will Press the touch pad on the outside liftgate handle. Pressing the buttons or touch pad a second time while the liftgate is moving reverses the direction. Press and hold 8 on the RKE transmitter. See Remote Keyless Entry (RKE) System Operation on page 2‑3.