2010 GMC Sierra 1500 Crew Cab Owner's Manual - Page 54

Manual Reclining Seatbacks On seats with manual reclining seatbacks, the lever used to operate them is located on the outboard side of the seat(s). To return the seatback to an upright position, do the following: 1. Lift the lever fully without applying pressure to the seatback and the seatback will return to the upright position. 2. Push and pull on the seatback to make sure it is locked. To recline the seatback: 1. Lift the recline lever. 2. Move the seatback to the desired position, then release the lever to lock the seatback in place. 3. Push and pull on the seatback to make sure it is locked. 2-12