GMC 2007 Sierra 1500 Pickup Owner's Manual page 106

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A right front passenger takes his/her weight off
of the seat for a period of time.
•
The right front passenger seat is occupied by
a smaller person, such as a child who has
outgrown child restraints.
•
Or, if there is a critical problem with the airbag
system or the passenger sensing system.
When the passenger sensing system has turned off
the passenger's frontal airbag, the off indicator will
light and stay lit to remind you that the airbag is off.
If a child restraint has been installed and the on
indicator is lit, turn the vehicle off. Remove
the child restraint from the vehicle and reinstall the
child restraint following the child restraint
manufacturer's directions and refer to Securing a
Child Restraint in the Right Front Seat Position
(Regular and Extended Cab) (With Passenger
Sensing System) in the Index.
If, after reinstalling the child restraint and restarting
the vehicle, the on indicator is still lit, check to
make sure that the vehicle's seatback is not
pressing the child restraint into the seat cushion. If
this happens, slightly recline the vehicle's
seatback and adjust the seat cushion if possible.
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Also make sure the child restraint is not trapped
under the vehicle head restraint. If this happens,
adjust the head restraint.
If the on indicator is still lit, secure the child in the
child restraint in a rear seat position in the vehicle if
one is available and check with your dealer.
The passenger sensing system is designed to
enable (may inflate) the right front passenger's
frontal airbag anytime the system senses
that a person of adult size is sitting properly in the
right front passenger's seat. When the passenger
sensing system has allowed the airbag to be
enabled, the on indicator will light and stay lit to
remind you that the airbag is active.
For some children who have outgrown child
restraints and for very small adults, the passenger
sensing system may or may not turn off the
right front passenger's frontal airbag, depending
upon the person's seating posture and body build.
Everyone in your vehicle who has outgrown
child restraints should wear a safety belt
properly — whether or not there is an airbag for
that person.