2011 GMC Acadia Owner's Manual - Page 59

Seats and Restraints 2. Push down on the head restraint after the button is released to make sure that it is locked in place. The vehicle's second‐row seats have head restraints in the outboard seating positions that cannot be adjusted. The vehicle's third‐row seats have headrests in the outboard seating positions that cannot be adjusted. The vehicle's head restraints and headrests are not designed to be removed. 3-3 Front Seats Seat Adjustment { WARNING You can lose control of the vehicle if you try to adjust a manual driver seat while the vehicle is moving. The sudden movement could startle and confuse you, or make you push a pedal when you do not want to. Adjust the driver seat only when the vehicle is not moving. A. Seat Adjustment Handle B. Driver Seat Height Adjustment Lever C. Seatback Lever