Subaru 2003 Legacy - Manual (Page 78)

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n Examples of the types of accidents in which the SRS frontal
airbag will basically not deploy.
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 involved in a low-speed frontal collision.
HB1044AB
The vehicle is struck from
the side.
HB0313 HB1043BB
In an accident where the vehicle is impacted more than once, the
SRS frontal airbag deploys only once.
Example: In the case of a double collision, first with another vehicle,
then against a concrete wall in immediate succession, once the SRS
frontal airbag is activated on the first impact, it will not be activated on
the second.
HB1070BB