Subaru BRZ 2017 Owner's Manual page 115

1-7. Safety information
The SRS airbag can function only when the ignition switch is in the "ON"
position.
If the front sub sensors located on both the right and left sides at the front of
the vehicle and the impact sensors in the airbag control module detect a cer-
tain predetermined amount of force during a front collision, the control mod-
1
ule sends signals to the front airbag modules instructing them to inflate the
SRS front airbags. Then both airbag modules produce gas, which instantly
inflates driver's and passenger's SRS front airbags. The knee airbag is also
inflated in combination with the SRS front airbags.
After deployment, the SRS airbags immediately start to deflate so that the
driver's vision is not obstructed. The time required from detecting impact to
the deflation of the SRS airbag after deployment is shorter than the blink of
an eye.
Although it is highly unlikely that the SRS airbag would activate in a non-
accident situation, should it occur, the SRS airbag will deflate quickly, not
obscuring vision and will not interfere with the driver's ability to maintain con-
trol of the vehicle.
When the SRS airbag deploys, a sudden, fairly loud inflation noise will be
heard and some smoke will be released. These occurrences are normal
result of the deployment. This smoke does not indicate a fire in the vehicle.
The SRS front airbag (and also the knee airbag) is designed to deploy in the
event of an accident involving a moderate to severe front collision. It is not
designed to deploy in most lesser front impacts because the necessary pro-
tection can be achieved by the seatbelt alone. Also, it is not designed to
deploy in most side or rear impacts or in most roll-over accidents because
deployment of the SRS front airbag would not help the occupant in those sit-
uations.
The SRS airbag is designed to function on a one-time-only basis.
SRS airbag deployment depends on the level of force experienced in the
passenger compartment during a collision. That level differs from one type of
collision to another, and it may have no bearing on the visible damage done
to the vehicle itself.
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