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Occupant safety
52
gering/deployment process should take place
in good time at the start of the collision.
The rate of vehicle deceleration or acceleration
and the direction of the force are essentially
determined by:
the distribution of forces during the collision
R
the collision angle
R
the deformation characteristics of the vehicle
R
the characteristics of the object with which
R
the vehicle has collided
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
only parts which are relatively easily deformed
are affected and the rate of deceleration is not
high. Conversely, an airbag may be deployed
even though the vehicle suffers only minor
deformation. This is the case if, for example,
very rigid vehicle parts such as longitudinal body
members are hit, and sufficient deceleration
occurs as a result.
If the restraint system control unit detects a side
impact or if the vehicle overturns, the applicable
components of the restraint system are activa-
ted independently of each other depending on
the apparent type of accident.
Sidebags on the side on which an impact
R
occurs, independent from the seat belt ten-
sioner and seat belt usage
Vehicles with the automatic front-passenger
airbag deactivation system: the sidebag on
the front-passenger side deploys under the
following conditions:
an occupant is detected on the front-
-
passenger seat or
the belt tongue is engaged in the belt
-
buckle of the front-passenger seat
Windowbag on the side on which an impact
R
occurs, independent of seat belt usage and
regardless of whether the front-passenger
seat is occupied
Seat belt tensioners, if the system determines
R
that deployment can offer additional protec-
tion for the vehicle occupants in this situation
Windowbags on the driver's and front-
R
passenger side in certain situations if the
vehicle overturns and if the system deter-
mines that deployment can offer additional
protection to that provided by the seat belt
i
Not all airbags are deployed in an accident.
The different airbag systems work independ-
ently of each other.
How the airbag system works is determined
by the severity of the accident detected,
especially the vehicle deceleration or accel-
eration, and the apparent type of accident:
frontal collision
R
side impact
R
overturn
R
®
PRE-SAFE
(anticipatory occupant
protection)
Introduction
In certain hazardous situations, PRE-SAFE
takes pre-emptive measures to protect the vehi-
cle occupants.
Important safety notes
!
Make sure that there are no objects in the
footwell or behind the seats. There is a risk
that the seats and/or the objects could be
damaged when PRE-SAFE
Although your vehicle is equipped with a PRE-
®
SAFE
system, the possibility of injury in the
event of an accident cannot be ruled out. Always
adapt your driving style to suit the prevailing
road and weather conditions and maintain a
safe distance from the vehicle in front. Drive
carefully.
Function
®
PRE-SAFE
intervenes:
in emergency braking situations, e.g. when
R
BAS is activated
in critical driving situations, e.g. when physi-
R
cal limits are exceeded and the vehicle under-
steers or oversteers severely
vehicles with the Driving Assistance package:
R
when a driver assistance system intervenes
powerfully or the radar sensor system detects
an imminent danger of collision in certain sit-
uations
®
®
is activated.
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