GMC Sierra Denali 2014 Owner's Manual page 70

3-20 Seats and Restraints
The front outboard passenger
frontal airbag is in the passenger
side instrument panel.
Driver Side Shown, Passenger
Side Similar
The seat-mounted side impact
airbags for the driver and front
outboard passenger are in the side
of the seatbacks closest to the door.
Driver Side Shown, Passenger
Side Similar
The roof-rail airbags for the driver,
front outboard passenger, and
second row outboard passengers
are in the ceiling above the side
windows.