Buick 1994 Century Owner's Manual page 20

Folding Second Seat
To Lower the Split Second Seatback:
Each seat has its
own release button. Press the release button and pull the
seatback forward and down.
I
To Raise the Split Second Seatback: Lift the seatback
until it locks in the upright position. Push back and forth
on the seatback to be sure it is locked in place.
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