2003 Buick Park Avenue Owner's Manual - Page 350

1. Buckle the center passenger position safety belt, then route the safety belts through the proper slots in the seat cushion. Don't let the safety belts get twisted. 2. Slide the rear of the cushion up and under the seatback so the rear locating guides hook into the wire loops on the back frame. 3. With the seat cushion lowered, push rearward and then press down on the seat cushion until the spring locks on both ends engage. 4. Check to make sure the safety belts are properly routed and that no portion of any safety belt is trapped under the seat. Also make sure the seat cushion is secured. 5-101