Cadillac 2004 CTS Owner's Manual page 59

The side impact air bag for the right front passenger
and the person seated directly behind that passenger is
in the ceiling above the side windows.
{
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 causing
severe injury or even death. 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, because your vehicle has side
impact air bags, 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 air
bag will be blocked. The path of an inflating air
bag must be kept clear.
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