GMC 2007 Acadia Owner's Manual page 89

Safety belts help keep the passenger in position
on the seat during vehicle maneuvers and braking,
which helps the passenger sensing system
maintain the passenger airbag status. See "Safety
Belts" and "Child Restraints" in the Index for
additional information about the importance of
proper restraint use.
CAUTION:
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If the airbag readiness light in the
instrument panel cluster ever comes on
and stays on, it means that something
may be wrong with the airbag system. If
this ever happens, have the vehicle
serviced promptly, because an adult-size
person sitting in the right front
passenger's seat may not have the
protection of the airbag(s). See Airbag
Readiness Light on page 217 for more on
this, including important safety
information.
A thick layer of additional material, such as a
blanket or cushion, or aftermarket equipment such
as seat covers, seat heaters, and seat massagers
can affect how well the passenger sensing
system operates.
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