GMC 2006 Yukon XL Owner's Manual page 84

If your vehicle has one, the right front passenger's
side impact airbag is in the side of the passenger's
seatback closest to the door.
1-78
CAUTION:
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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. Do not let seat covers
block the inflation path of a side impact airbag.