2010 GMC Canyon Extended Cab Owner's Manual - Page 36

Head Restraints The front seats may have adjustable head restraints. If the vehicle has rear seats, they may have adjustable head restraints. Pull up on the head restraint to raise it. To lower the head restraint, press the button located on top of the seatback and push down on the head restraint. Adjust the head restraint so that the top of the restraint is at the same height as the top of the occupant's head. This position reduces the chance of a neck injury in a crash. 2-8