1997 GMC Suburban Owner's Manual - Page 20

After returning the seat to the passenger position, pull forward on the seatback to make sure it is locked into place. Also, return the safety belts and head restraints to their original positions, so they will be available for rear seat passengers to use. Folding the Rear Seat(4-DOOr Utility Model) If your vehicle has a 60/40 rear seat, either side may be folded down to give you more cargo space. Before folding, place the latch portion of the center safety belt in the center armrest.That way, the center safety belt will be out of the way when the seat is folded and also will be easily available forpassengers to use when the seat is returned to the passenger position. Also, make sure that nothing is under or in front of the seat. When the seat is folded, it will lay flat on the floor. When folding the seat, first remove the head restraints. Push the release buttons at the bottom of each head restraint height adjust post and slide the head restraint out of the height-adjust tubes. Set the head restraints aside for now. You will stow them in their proper position after you are done folding the seat. 1-10