GMC 2010 Sierra 1500 Crew Cab Owner's Manual page 260

If the vehicle has one of the indicators pictured in the
following illustrations, then the vehicle has a passenger
sensing system for the right front passenger position
unless there is an airbag off switch located in the glove
box. If there is an airbag off switch, the vehicle does not
have a passenger system system. See
.
The passenger airbag status indicator is on the
overhead console. See
for important safety information.
In addition, if the vehicle has a passenger sensing
system for the right front passenger position, the label
on the vehicle's sun visor refers to ADVANCED
AIRBAGS .
4-36
When the vehicle is started, the passenger airbag
status indicator will light ON and OFF, or the symbol for
on and off, for several seconds as a system check.
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
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 frontal airbag is enabled (may inflate).