GMC 2010 Sierra 1500 Crew Cab Owner's Manual page 258

If the vehicle has an airbag on-off switch, it also has a
passenger airbag status indicator located in the
overhead console.
When the vehicle is started, the passenger airbag
status indicator will light ON and OFF, or the symbol for
on and off, will light for several seconds as a system
check. Then, after several more seconds, the status
indicator ON or OFF, or either the on or off symbol, will
light to let you know the status of the right front
passenger frontal airbag.
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When the right front passenger airbag is manually
turned off using the airbag on-off switch in the glove
box, the indicator light OFF or the off symbol will come
on and stay on as a reminder that the airbag has been
turned off. This light will go off when the airbag has
been turned on. See
for more information, including important safety
information.