Buick 2001 Century Owner's Manual page 37

The driver's side impact air bag is in the side of the
driver's seatback closest to the door.
CAUTION:
If something is between an occupant and an
air bag, the bag might not inflate properly
or it might force the object into that person.
The path of an inflating air bag must be kept
clear. Don't put anything between an occupant
and an air bag, and don't attach or put anything
on the steering wheel hub or on or near any other
air bag covering and don't let seat covers block
the inflation path of a side impact air bag.
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