Oldsmobile 1999 Alero - Manual (Page 11)

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Reclining Front Seatbacks
To adjust the seatback, lift the lever on the outer 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 and the seat will go to an upright position. But don’t have a seatback reclined if your vehicle
is moving.
CAUTION:
Sitting in a reclined position when your vehicle is
in motion can be dangerous. Even if you buckle
CAUTION: (Continued)