Chevrolet 2007 Avalanche Owner's Manual page 84

The passenger sensing system is designed to
enable (may inflate) the right front passenger's
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 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.
If a person of adult-size is sitting in the right
front passenger's seat, but the off indicator is lit,
it could be because that person is not sitting
properly in the seat. If this happens, turn
the vehicle off and ask the person to place the
seatback in the fully upright position, then sit
upright in the seat, centered on the seat cushion,
with the person's legs comfortably extended.
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Restart the vehicle and have the person remain
in this position for about two minutes. This
will allow the system to detect that person and
then enable the passenger's airbag.
I n f o r ma t i o n P r o v i d e d b y :