Buick Lucerne 2007 Owner's Manual page 76

The roof-mounted side impact airbag for the right
front passenger and the person seated directly
behind that passenger is in the ceiling above the
side windows.
76
CAUTION:
{
If something is between an occupant and
an airbag, the airbag might not inflate
properly or it might force the object into
that person causing severe injury or even
death. The path of an inflating airbag
must be kept clear. Do not put anything
between an occupant and an airbag, and
do not attach or put anything on the
steering wheel hub or on or near any
other airbag covering. Never secure
anything to the roof of your vehicle by
routing the rope or tie-down through any
door or window opening. If you do, the
path of an inflating airbag will be blocked.
Do not let seat covers block the inflation
path of a side impact airbag. The path of
an inflating airbag must be kept clear.