See also:

Unfastening the rear seatbelts seatbelt
Push the button on the buckle. Before closing the door, make sure that the belts are retracted properly to avoid catching the belt webbing in the door. ...

Examples of the types of accidents in which it is possible that the SRS side airbag and the SRS curtain airbag will deploy (Outback).
1) Hitting a curb, edge of pavement or hard surface 2) Falling into or jumping over a deep hole 3) Landing hard or vehicle falling It is possible that the SRS side and curtain airbags will deploy ...

System monitors
A diagnostic system continually monitors the readiness of the seatbelt pretensioner while the vehicle is being driven. The seatbelt pretensioners share the control module with the SRS airbag s ...