Buick 2008 Lucerne Owner's Manual page 68

Your vehicle also has a dual-depth passenger airbag
that adjusts the restraint according to crash severity,
seat location, and safety belt status using electronic
frontal sensor(s) and other special sensors which enable
the sensing system to monitor the position of the front
passenger seat. The passenger airbag inflates to a
reduced depth when the passenger seat is in a forward
position. For more rearward front seating positions,
the passenger airbag may inflate to an increased depth
(a full deployment), based on safety belt status and
the crash severity measured early in the event. (Always
wear your safety belt, even with frontal airbags.)
Your vehicle has seat-mounted side impact and roof-rail
airbags. See Airbag System on page 1-58.
Seat-mounted side impact and roof-rail airbags are
intended to inflate in moderate to severe side crashes.
Seat-mounted side impact and roof-rail airbags will
inflate if the crash severity is above the system's
designed threshold level. The threshold level can vary
with specific vehicle design.
1-64
Seat-mounted side impact and roof-rail airbags are not
intended to inflate in frontal impacts, near-frontal
impacts, rollovers, or rear impacts. A seat-mounted side
impact airbag is intended to deploy on the side of the
vehicle that is struck. Both roof-rail airbags will
deploy when either side of the vehicle is struck.
In any particular crash, no one can say whether an airbag
should have inflated simply because of the damage to a
vehicle or because of what the repair costs were. For
frontal airbags, inflation is determined by what the vehicle
hits, the angle of the impact, and how quickly the vehicle
slows down. For seat-mounted side impact and roof-rail
airbags, deployment is determined by the location and
severity of the side impact.