Ford Mariner Owner's Manual page 151

The Safety Canopy is mounted to roof side-rail sheet metal, behind the
headliner, above the first and second row seats. The Safety Canopy is
designed to inflate between the side window area and occupants to
further enhance protection provided in side impact collisions and rollover
events.
The fact that the Safety Canopy did not activate in a collision does not
mean that something is wrong with the system. Rather, it means the
forces were not of the type sufficient to cause activation. The Safety
Canopy is designed to inflate in certain side impact collisions or rollover
events, not in rear impact, frontal or near-frontal collisions, unless the
collision causes sufficient lateral deceleration or rollover likelihood.
WARNING: Several Safety
Canopy system
components get hot after inflation.
Do not touch them after inflation.
WARNING: If the Safety
Canopy system has
deployed, the Safety Canopy will
not function again unless replaced.
The Safety Canopy system
(including the A, B, C, and D
pillar trim and headliner) must be
inspected and serviced by an
authorized dealer. If the Safety
Canopy is not replaced, it will
not function again, which will
increase the risk of injury in a
future collision.
Determining if the system is operational
The SRS uses a readiness light in the instrument cluster or a tone to
indicate the condition of the system. Refer to Warning lights and
chimes in the Instrument Cluster chapter. Routine maintenance of the
side airbag is not required.
2010 Mariner (mrn)
Owners Guide, 2nd Printing
USA (fus)
Seating and Safety Restraints
151