Reclining Seatbacks - Buick 2005 Century Owner's Manual

Reclining Seatbacks

To adjust the seatback, lift the lever located on the
outboard side of the seat and move the seatback
to where you want it. Release the lever to lock the
seatback. Pull up on the lever without pushing on the
seatback and the seatback will go to an upright position.
1-4
But don't have a seatback reclined if your vehicle
is moving.