Subaru IMPREZA 2002 Owner's Manual page 73

Seat, seatbelt and SRS airbags
n When will the SRS frontal airbag not deploy?
1-50
HG1036BA
The SRS frontal airbag is basically not designed to
deploy if the vehicle is struck from side or from
behind, or if it rolls onto its side or roof, or if it is in-
volved in a low-speed frontal collision.
In an accident where the vehicle is impacted more
than once, the SRS frontal airbag deploys only once.
1) First impact 2) Second impact
Example: In the case of a double collision, first with
another vehicle, then against a concrete wall in im-
mediate succession, the SRS frontal airbag is acti-
vated on the first impact but not on the second.
HG1026BB