GMC Sierra Classic 2007 Owner's Manual page 100

The passenger sensing system will turn off the
right front passenger's frontal airbag under certain
conditions. The driver's airbag is not part of the
passenger sensing system.
The passenger sensing system works with
sensors that are part of the right front passenger's
seat and safety belt. The sensors are designed
to detect the presence of a properly-seated
occupant and determine if the passenger's frontal
airbag should be enabled (may inflate) or not.
Accident statistics show that children are safer if
they are restrained in the rear rather than the front
seat. We recommend that children be secured
in a rear seat, including: an infant or a child riding
in a rear-facing child restraint; a child riding in
a forward-facing child seat; an older child riding in
a booster seat; and children, who are large
enough, using safety belts.
A label on your sun visor says, "Never put a
rear-facing child seat in the front." This is because
the risk to the rear-facing child is so great, if the
airbag deploys.
100
CAUTION:
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A child in a rear-facing child restraint can
be seriously injured or killed if the right
front passenger's airbag inflates. This is
because the back of the rear-facing child
restraint would be very close to the
inflating airbag.
Even though the passenger sensing
system is designed to turn off the right
front passenger's frontal airbag if the
system detects a rear-facing child restraint,
no system is fail-safe, and no one can
guarantee that an airbag will not deploy
under some unusual circumstance, even
though it is turned off. We recommend that
rear-facing child restraints be secured in
the rear seat, even if the airbag is off.
If you need to secure a forward-facing child
restraint in the right front seat, always
move the front passenger seat as far back
as it will go. It is better to secure the child
restraint in a rear seat.