Oldsmobile 2002 Aurora - Manual (Page 329)

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To reinstall the rear seat cushion, do the following:
1. Buckle the center passenger position safety belt, and
then route the safety belts through the proper slots in
the seat cushion. Don’t let the safety belt 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.