GMC 2010 Yukon XL Denali Owner's Manual page 108

Here are the most important things to know about the
airbag system:
WARNING:
You can be severely injured or killed in a crash if
you are not wearing your safety belt
you have airbags. Airbags are designed to work
with safety belts, but do not replace them. Also,
airbags are not designed to deploy in every crash.
In some crashes safety belts are your only
restraint. See When Should an Airbag Inflate? on
page 2 81.
Wearing your safety belt during a crash helps
reduce your chance of hitting things inside the
vehicle or being ejected from it. Airbags are
supplemental restraints to the safety belts.
Everyone in your vehicle should wear a safety
belt properly whether or not there is an airbag
for that person.
2-76
Airbags inflate with great force, faster than the
blink of an eye. Anyone who is up against, or
very close to, any airbag when it inflates can be
seriously injured or killed. Do not sit unnecessarily
even if
close to the airbag, as you would be if you were
sitting on the edge of your seat or leaning forward.
Safety belts help keep you in position before and
during a crash. Always wear your safety belt,
even with airbags. The driver should sit as far
back as possible while still maintaining control of
the vehicle.
Occupants should not lean on or sleep against the
door or side windows in seating positions with
seat-mounted side impact airbags and/or roof-rail
airbags.
WARNING: