Chevrolet 2007 TrailBlazer Owner's Manua page 204

Then, after several more seconds, the status
indicator will light either ON or OFF, or either the
on or off symbol to let you know the status of
the right front passenger's frontal airbag.
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
is enabled (may inflate).
204
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. 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.
If your vehicle has a rear seat that will
accommodate a rear-facing child restraint, a label
on your sun visor says, "Never put a rear-facing
child seat in the front." This is because the risk to
the rear-facing child is so great, if the airbag
deploys.