Cadillac 2004 DeVille Owner's Manual page 62

In many crashes severe enough to inflate an air bag,
windshields are broken by vehicle deformation.
Additional windshield breakage may also occur from the
right front passenger air bag.
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Air bags are designed to inflate only once. After an
air bag inflates, you'll need some new parts for
your air bag system. If you don't get them, the air
bag system won't be there to help protect you
in another crash. A new system will include air bag
modules and possibly other parts. The service
manual for your vehicle covers the need to replace
other parts.
•
Your vehicle is equipped with an electronic frontal
sensor, which helps the sensing system distinguish
between a moderate frontal impact and a more
severe frontal impact. Your vehicle is also equipped
with a crash sensing and diagnostic module, which
records information about the frontal air bag system.
The module system records information about the
readiness of the system, when the system
commands air bag inflation and driver's safety belt
usage at deployment or near-deployment crash. The
module also records speed, engine rpm, brake and
throttle data.
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Let only qualified technicians work on your air bag
systems. Improper service can mean that an air bag
system won't work properly. See your dealer for
service.
Notice: If you damage the covering for the driver's
or the right front passenger's air bag, or the air
bag covering on the driver's, right front passenger's
or rear seatback, the bag may not work properly.
You may have to replace the air bag module in the
steering wheel, both the air bag module and the
instrument panel for the right front passenger's air
bag, or both the air bag module and seatback
for the side impact air bag. Do not open or break
the air bag coverings.