1997 GMC Suburban Owner's Manual - Page 23

To create a load floor. release the panels from the seatback by pushing rearward on the latch and fold them out to cover the rear seat footwell. Then lift the rear seatback up and push rearward until it latches. Return the head restraints to their original positions and lower the seat cushion until it latches into position. After returning the seat to the passenger position, pull forward on the seatback and up on the cushion to make sure the seat is locked into place. If the latch plate portion of the center safety belt was put in the center armrest when the seat was folded, take the latch plate portion out and place it on the seat. That way, the center position safety belt will be available forthe center rear seat passenger to use. To return the seat to the passenger position,lift the load floor panels and latch them into the seatback. 1-13