Saturn 2006 Ion Owner's Manual page 64

If your vehicle has a roof-mounted side impact airbag
for the right front passenger and the person seated
directly behind that passenger, it is in the ceiling above
the side windows.
1-58
CAUTION:
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If something is between an occupant and an
airbag, the bag 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. And, if your vehicle
has roof-mounted side impact airbags, never
secure anything to the roof of your vehicle
by routing the rope or tiedown through any
door or window opening. If you do, the path
of an inflating side impact airbag will be
blocked. The path of an inflating airbag
must be kept clear.