GMC 2007 Acadia Owner's Manual page 219

If the word ON or the on symbol is lit on the
passenger airbag status indicator, it means that
the right front passenger's frontal airbag and
seat-mounted side impact airbag are enabled
(may inflate).
CAUTION:
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If the on indicator comes on when you have
a rear-facing child restraint installed in the
right front passenger's seat, it means that
the passenger sensing system has not
turned off the passenger's frontal airbag
and seat-mounted side impact airbag
(if equipped). 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. Do not use a rear-facing
child restraint in the right front passenger's
seat if the airbag is turned on.
CAUTION:
{
Even though the passenger sensing
system is designed to turn off the right
front passenger's frontal airbag and
seat-mounted side impact airbag
(if equipped) 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 a rear seat,
even if the airbag is or airbags are off.
If the word OFF or the off symbol is lit on the
passenger airbag status indicator, it means that
the passenger sensing system has turned off
the right front passenger's frontal airbag and
seat-mounted side impact airbag. See Passenger
Sensing System on page 85 for more on this,
including important safety information.
219