GMC 2007 Acadia Owner's Manual page 88

Also make sure the child restraint is not trapped
under the vehicle head restraint. If this happens,
adjust the head restraint. See Head Restraints
on page 17.
Remove any additional material from the seat
cushion before reinstalling or securing the
child restraint.
If the on indicator is still lit, secure the child in the
child restraint in a rear seat position in the vehicle,
and check with your dealer/retailer.
The passenger sensing system is designed to
enable (may inflate) the right front passenger's
frontal airbag and seat-mounted side impact 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 airbags to be enabled, the
on indicator will light and stay lit to remind you
that the airbags are active.
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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 and
seat-mounted side impact 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. Restart the
vehicle and have the person remain in this position
for two to three minutes. This will allow the
system to detect that person and then enable the
right front passenger's frontal airbag and
seat-mounted side impact airbag.