Mercedes-Benz S-Class Saloon W223 2021 Owner's Manual page 44

42 Occupant safety
warning lamp lights up. It goes out no later than a
few seconds after the vehicle is started. The com-
ponents of the restraint system are then func-
tional.
Malfunctioning restraint system
A malfunction has occurred in the restraint sys-
tem if:
the 6 restraint system warning lamp does
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not light up when the ignition is switched on
the 6 restraint system warning lamp lights
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up continuously or repeatedly during a journey
& WARNING Risk of injury due to malfunc-
tions in the restraint system
Components in the restraint system may be
activated unintentionally or not deploy as
intended in an accident.
Have the restraint system checked and
#
repaired immediately at a qualified spe-
cialist workshop.
Function of the restraint system in an accident
How the restraint system works depends on the
severity of the impact detected and the apparent
type of accident:
Frontal impact
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Rear impact
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Side impact
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Rollover
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The activation thresholds for the components of
the restraint system are determined based on the
evaluation of the sensor values measured at vari-
ous points in the vehicle. This process is pre-emp-
tive in nature. The triggering/deployment of the
components of the restraint system must take
place in good time at the start of the collision.
Factors which can only be seen and measured
after a collision has occurred cannot play a deci-
sive role in airbag deployment. Nor do they pro-
vide an indication of airbag deployment.
The vehicle may be deformed significantly without
an airbag being deployed. This is the case if only
parts which are relatively easily deformed are
affected and the rate of vehicle deceleration is
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not high. Conversely, an airbag may be deployed
even though the vehicle suffers only minor defor-
mation. If very rigid vehicle parts such as longitu-
dinal members are hit, this may result in suffi-
ciently high levels of vehicle deceleration.
Depending on the detected deployment situation,
the components of the restraint system can be
activated or deployed independently of each
other:
Seat belt tensioner: frontal impact, rear
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impact, side impact, rollover
Driver's airbag, front passenger airbag: frontal
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impact
Knee airbag: frontal impact
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Side airbag: side impact
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Centre airbag: side impact, rollover
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Window airbag: side impact, rollover, frontal
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impact
Belt airbag: frontal impact
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®
PRE-SAFE Impulse Side: side impact
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The front passenger airbag can only be deployed
in an accident if the PASSENGER AIR BAG OFF