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How the air bag system works is deter-
mined by the severity of the accident detec-
ted, especially the vehicle deceleration or
acceleration, and the apparent type of acci-
dent:
R
frontal collision
R
side impact
R
rollover
PRE-SAFE
®
(anticipatory occupant
protection system)
Introduction
In certain hazardous situations, PRE-SAFE
®
takes pre-emptive measures to protect the
vehicle occupants.
Important safety notes
!
Make sure that there are no objects in the
footwell or behind the seats. There is a dan-
ger that the seats and/or objects could be
damaged when PRE-SAFE
®
is activated.
Although your vehicle is equipped with PRE-
SAFE
®
, 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:
R
in emergency braking situations, e.g. when
BAS is activated
R
in critical driving situations, e.g. when phys-
ical limits are exceeded and the vehicle
understeers or oversteers severely
R
on vehicles with the Active Driving Assis-
tance package: if BAS PLUS intervenes
powerfully or the radar sensor system
detects an imminent danger of collision in
certain situations
PRE-SAFE
®
takes the following measures
depending on the hazardous situation detec-
ted:
R
the front seat belts are pre-tensioned.
R
if the vehicle skids, the sliding sunroof and
the side windows are closed so that only a
small gap remains. The panorama roof with
power tilt/sliding panel is completely
closed.
R
vehicles with the memory function: the
front-passenger seat is adjusted if it is in an
unfavorable position.
R
vehicles with a multicontour seat: the air
pressure in the side bolsters of the seat
backrest is increased.
If the hazardous situation passes without
resulting in an accident, PRE-SAFE
®
slackens
the belt pre-tensioning. On vehicles with mul-
ticontour seats, the air pressure in the side
bolsters is reduced again. All settings made
by PRE-SAFE
®
can then be reversed.
If the seat belt pre-tensioning is not reduced:
X
Move the seat backrest or seat back
slightly when the vehicle is stationary.
The seat belt pre-tensioning is reduced and
the locking mechanism is released.
The seat-belt adjustment is an integral part of
the PRE-SAFE
®
convenience function. Infor-
mation about the convenience function can
be found under "Belt adjustment"
(Y page 49).
Automatic measures after an acci-
dent
Immediately after an accident, the following
measures are implemented, depending on
the type and severity of the impact:
R
by activating the hazard warning lamps
R
the emergency lighting is activated
R
the vehicle doors are unlocked
R
the front side windows are lowered
60
Occupant safety
Safety
62


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