GMC Envoy Owner's Manual page 64

In many crashes severe enough to inflate an airbag,
windshields are broken by vehicle deformation.
Additional windshield breakage may also occur from the
right front passenger airbag.
•
Airbags are designed to inflate only once. After an
airbag inflates, you will need some new parts for
your airbag system. If you do not get them,
the airbag system will not be there to help protect
you in another crash. A new system will include
airbag modules and possibly other parts. The
service manual for your vehicle covers the need to
replace other parts.
•
Your vehicle is equipped with a crash sensing and
diagnostic module which records information after
a crash. See Vehicle Data Collection and Event
Data Recorders on page 7-10.
•
Let only qualified technicians work on your airbag
system. Improper service can mean that your
airbag system will not work properly. See your
dealer for service.
Notice: If you damage the covering for the driver's
or the right front passenger's airbag, or the side
impact airbag covering on the ceiling near the side
windows, the airbag may not work properly. You
may have to replace the airbag module in the
steering wheel, both the airbag module and the
instrument panel for the right front passenger's
airbag, or side impact airbag module and ceiling
covering for the roof-mounted side impact airbag.
Do not open or break the airbag coverings.
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