Mercedes-Benz C-Class 2014 Owner's Manual page 87

Driving safety systems
84
Detection by the radar sensor system is also
impaired in the event of:
dirt on the sensors or obscured sensors
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interference by other radar sources
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strong radar reflections, for example, in
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multi-storey car parks
a narrow vehicle travelling in front, e.g. a
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motorcycle
a vehicle travelling in front on a different
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line
Detection by the camera system is also
impaired in the event of:
dirt on the camera or if the camera is cov-
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ered
glare on the camera system, e.g. from the
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sun being low in the sky
darkness
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if:
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pedestrians move quickly, e.g. into the
-
path of the vehicle
the camera system no longer detects a
-
pedestrian as a person due to special
clothing or other objects
a pedestrian is concealed by other
-
objects
the typical outline of a person is not dis-
-
tinguishable from the background
Following damage to the front end of the vehi-
cle, have the radar sensor settings and oper-
ation checked at a qualified specialist work-
shop. This also applies to collisions at slow
speeds where there is no visible damage to
the front of the vehicle.
Following damage to the windscreen, have
the configuration and operation of the cam-
era system checked at a qualified specialist
workshop.
Function
To activate/deactivate: activate or deac-
X
®
tivate PRE-SAFE Brake in the on-board
computer ( page 309).
Y
®
If the PRE-SAFE Brake is not activated, the
æ symbol appears in the multifunction
display.
This function will issue a warning if:
at a speed of around 30 km/h or more, the
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distance maintained to the vehicle travel-
ling in front is insufficient for several sec-
onds.
The · distance warning lamp then lights
up in the instrument cluster.
at a speed of approximately 7 km/h or
R
higher, you very quickly approach a vehicle
in front or a pedestrian.
An intermittent warning tone will then
sound and the · distance warning lamp
lights up in the instrument cluster.
Brake immediately to defuse the situation.
X
or
Take evasive action provided it is safe to do
X
so.
If there is an increased risk of collision, pre-
ventive passenger protection measures (PRE-
®
SAFE ) are activated.
If the risk of collision with the vehicle in front
remains and you do not brake, take evasive
action or accelerate significantly, the vehicle
may perform automatic emergency braking,
up to the point of full brake application. Auto-
matic emergency braking is not performed
until immediately prior to an imminent acci-
dent.
You can prevent the intervention of PRE-
®
SAFE Brake at any time by:
depressing the accelerator pedal further
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activating kickdown
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releasing the brake pedal
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