Lexus LS400 Owner's Manual page 105

COMFORT ADJUSTMENT
16L188−2
"Vehicle roll−over
The side airbags are not designed to inflate if the vehicle is rolled
over.
If the impact on the body of the passenger compartment is not strong
as illustrated above, the relevant side airbag may not inflate.
90
16L193−1
" 1 Side airbag module (airbag and inflator)
2 Front passenger airbag module (airbag and inflator)
3 Side airbag sensor assembly
4 Seat belt pretensioner
5 Steering wheel pad assembly (airbag and inflator)
6 SRS warning light
7 Driver and front passenger airbag sensor assembly
The SRS airbag sensor assemblies consist of a safing sensor and
driver and front passenger airbag sensor.
In a severe frontal impact, the driver and front passenger airbag
sensor detects deceleration and the system triggers the front airbag
inflators and seat belt pretensioners. In a severe side impact, the side
airbag sensor triggers the side airbag inflator. Then a chemical
reaction in the inflators momentarily fills the airbags with non−toxic
gas to help restrain the forward or lateral motion of the occupants.
Then the inflators fill the airbags and the seat belts are quickly drawn
back in by the retractors to help restrain forward motion of the
occupants.
When the SRS operates, it produces a fairly loud noise and release