Subaru BRZ 2018 Owner's Manual page 120

1-7. Safety information
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Example of the type of accident in which the SRS side airbag and SRS
curtain airbag will most likely deploy
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Examples of the types of accidents in which the SRS curtain airbag will
most likely deploy
118
A severe side impact near the front seat
activates the SRS side airbag and SRS
curtain airbag.
The vehicle rolls onto its side or the roof.
The side of the vehicle raises above a
certain threshold or the vehicle skids and
its tires hit a curbstone laterally.