GMC Sierra 2015 Owner's Manual page 84

The front outboard passenger
frontal airbag is in the passenger
side instrument panel.
Driver Side Shown, Passenger
Side Similar
If the vehicle has seat-mounted side
impact airbags for the driver and
front outboard passenger, they are
in the side of the seatbacks closest
to the door.
Seats and Restraints
Driver Side Crew Cab Shown,
Passenger Side Double and
Regular Cabs Similar
If the vehicle has roof-rail airbags
for the driver, front outboard
passenger, and second row
outboard passengers, they are in
the ceiling above the side windows.
Warning
If something is between an
occupant and an airbag, the
airbag might not inflate properly
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(Continued)