Subaru 2004 Impreza Owner's Manual page 98

There are many types of collisions which might not
necessarily require SRS side airbag deployment. In
the event of accidents like those illustrated, the SRS
side airbag may not deploy depending on the level of
accident forces involved.
Seat, seatbelt and SRS airbags
" When will the SRS side airbag not deploy?
1
2
1) The vehicle is involved in a frontal collision with anoth-
er vehicle (moving or stationary).
2) The vehicle is struck from behind.
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