GMC 2004 Canyon - Manual (Page 71)

If your vehicle has a roof-mounted side impact air bag
for the right front passenger and the person seated
directly behind that passenger, it is located 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. Do not put
anything between an occupant and an air bag,
and do not attach or put anything on the
steering wheel hub or on or near any other air
bag covering. If 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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