Subaru BRZ 2017 Owner's Manual page 120

1-7. Safety information
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SRS airbag operation
The SRS side airbag and SRS curtain airbag can function only when the
ignition switch is in the "ON" position.
The driver's and front passenger's SRS side airbags and SRS curtain air-
bags deploy independently of each other since each has its own impact sen-
sor. Therefore, they may not both deploy in the same accident. Also, the
SRS side airbag and SRS curtain airbag deploy independently of the driver's
and front passenger's SRS front airbags in the steering wheel and instru-
ment panel.
An impact sensor, which senses impact force, is located in each of the left
and right center pillars, doors and rear wheel houses. Another impact sen-
sor, which also senses impact force, is located under the center of the rear
seats.
If one of the center pillar impact sensors and the impact sensor that is
located under the center of the rear seats together sense an impact force
above a predetermined level in a side collision, the control module causes
both the SRS side airbag and SRS curtain airbag on the impacted side to
inflate regardless of whether the rear wheel house impact sensor on the
same side senses an impact.
If one of the rear wheel house impact sensors and the impact sensor that is
located under the center of the rear seats together sense an impact force
above a predetermined level in a side collision, the control module causes
only the SRS curtain airbag on the impacted side to inflate.
After the deployment, the SRS side airbag immediately starts to deflate. The
time required from detection of an impact to deflation of an SRS side airbag
after deployment is shorter than the blink of an eye. The SRS curtain airbag
remains inflated for a while following deployment then slowly deflates.
The SRS side airbag and SRS curtain airbag deploy even when no one
occupies the seat on the side on which an impact is applied.
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