Buick 2001 Regal Owner's Manual page 38

The driver's side impact air bag is in the side of the
driver's seatback closest to the door.
1-26
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.
When should an air bag inflate?
The driver's and right front passenger's frontal air bags
are designed to inflate in moderate to severe frontal or
-
near frontal crashes. But they are designed to inflate
only if the impact speed is above the system's
designed "threshold level."