Subaru Impreza 2016 Manual page 88

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Seat, seatbelt and SRS airbags/*SRS airbag (Supplemental Restraint System airbag)
! At what other times might the
SRS frontal airbag deploy?
The SRS frontal airbag may be activated
when the vehicle sustains a hard impact in
the undercarriage area from the road
surface (such as when the vehicle
plunges into a deep ditch, is severely
impacted or knocked hard against an
obstacle on the road such as a curb).