Subaru 2004 Baja Owner's Manual page 82

The SRS frontal airbag may be activated when the ve-
hicle sustains a hard impact in the undercarriage area
from the road surface (such as when the vehicle
plunges into a deep ditch, is severely bumped or
knocked hard against an obstacle on the road such as
a curb).
Seat, seatbelt and SRS airbags
" Examples of the types of accidents in which the
SRS frontal airbag is unlikely to deploy.
There are many types of collisions which might not
necessarily require SRS frontal airbag deployment. If
the vehicle strikes an object, such as a telephone pole
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