Buick 1994 Century Owner's Manual page 22

4. Push the seatback all the way up until it locks in the
upright position. Push back and forth on the seatback
to be sure it is locked in place.
To Lower the Rear-Facing Third Seatback:
1.
Open the liftgate and lift the seat release lever
located at the lower corner of the storage
compartment on the passenger side.
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