Srs Warning Light; If The Srs Airbags Deploy (Inflate); Operating Conditions (Front Airbags) - Lexus IS250 2009 Service Manual

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1-7. Safety information
In certain types of severe frontal or side impacts, the SRS airbag system
triggers the airbag inflators. A chemical reaction in the inflators quickly
fills the airbags with non-toxic gas to help restrain the motion of the occu-
pants.

SRS warning light

n
This warning light system monitors the airbag sensor assembly, front airbag sensors,
side and curtain shield airbag sensor assemblies, curtain shield airbag sensor
assemblies, driver's seat position sensor, driver's seat belt buckle switch, seat belt
pretensioner assemblies, inflators, interconnecting wiring and power sources.
( P. 384)

If the SRS airbags deploy (inflate)

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Bruising and slight abrasions may result from contact with a deploying (inflating)
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SRS airbag.
A loud noise and white powder will be emitted.
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Parts of the airbag module (steering wheel, airbag cover and inflator) as well as
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the front seats, and parts of the front pillar, rear pillar and roof side rail, may be
hot for several minutes. The airbag itself may also be hot.
The windshield may crack.
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Operating conditions (front airbags)

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The SRS front airbags will deploy if the severity of the frontal impact is above the
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designed threshold level, comparable to an approximate 15 mph (25 km/h) col-
lision when the vehicle impacts straight into a fixed barrier that does not move
or deform.
However, this threshold velocity will be considerably higher if the vehicle strikes
an object, such as a parked vehicle or sign pole, which can move or deform on
impact, or if the vehicle is involved in an underride collision (e.g. a collision in
which the front of the vehicle "underrides", or goes under, the bed of a truck, etc.).
It is possible that in some collisions where the forward deceleration of the vehi-
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cle is very close to the designed threshold level, the SRS front airbags and the
seat belt pretensioners may not activate together.
The SRS front passenger airbag will not activate if there is no passenger sitting
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in the front passenger seat. However, the front passenger airbag may deploy if
luggage is put in the seat, or the seat belt is fastened, even if the seat is unoccu-
pied. ( P. 95)
86

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