Mercedes-Benz A-Class 2021 Operator's Manual page 39

tem warning lamp lights up. It goes out no later
than a few seconds after the vehicle is started.
The components of the restraint system are then
functional.
Malfunctioning restraint system
A malfunction has occurred in the restraint sys‐
tem if:
The 6 restraint system warning lamp
R
does not light up when the ignition is
switched on
The 6 restraint system warning lamp
R
lights 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
planned in an accident.
Have the restraint system checked and
#
repaired immediately at a qualified spe‐
cialist workshop.
Function of the restraint system in an acci‐
dent
How the restraint system works is determined by
the severity of the impact detected and the type
of accident anticipated:
Frontal impact
R
Rear impact
R
Side impact
R
Rollover
R
The activation thresholds for the components of
the restraint system are determined based on
the evaluation of the sensor values measured at
various points in the vehicle. This process is pre-
emptive in nature. The triggering/deployment of
the components of the restraint system must
take place in good time at the start of the colli‐
sion.
Factors which can only be seen and measured
after a collision has occurred do not play a deci‐
sive role in the deployment of an airbag. Nor do
they provide an indication of airbag deployment.
The vehicle may be deformed significantly with‐
out an airbag being deployed. This is the case if
Occupant safety
only parts which are relatively easily deformed
are affected and the rate of vehicle deceleration
is not high. Conversely, an airbag may be
deployed even though the vehicle suffers only
minor deformation. If very rigid vehicle parts
such as longitudinal members are hit, this may
result in sufficiently high levels of vehicle decel‐
eration.
Depending on the detected deployment situa‐
tion, the components of the restraint system can
be activated or deployed independently of each
other:
Emergency Tensioning Device: frontal
R
impact, rear impact, side impact, rollover
Driver's airbag, front passenger airbag: fron‐
R
tal impact
Knee airbag: frontal impact
R
Side airbag: side impact
R
Window curtain airbag: side impact, rollover,
R
frontal impact
The front passenger airbag can only be deployed
in an accident if the PASSENGER AIR BAG OFF
indicator lamp is off. If the front passenger seat
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