Pontiac 2003 Montana Owner's Manual page 101

The right front passenger's frontal air bag is in the
instrument panel on the passenger's side.
If your vehicle has one, the driver's side impact air bag is
in the side of the driver's seatback closest to the door.
If your vehicle has one, the right front passenger's side
impact air bag is in the side of the passenger's
seatback closest to the door.
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