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04 Comfort and driving pleasure
Collision Warning with Auto Brake*
04
``
*Option/accessory, for more information, see Introduction. 169
for Car settings Collision warning
settings, see page 118.
Limitations
The visual warning signal may be difficult to
notice in the event of strong sunlight, reflec-
tions, when sunglasses are being worn or if the
driver is not looking straight ahead. The warn-
ing sound should therefore always be acti-
vated.
NOTE
The visual warning signal can be temporarily
disengaged in the event of high passenger
compartment temperature caused by
strong sunlight for example. If this occurs
then the warning sound is activated even if
it is deactivated in the menu system.
Warnings may not appear if the dis-
tance to the vehicle in front is small or if
steering wheel and pedal movements
are large, e.g. a very active driving style.
WARNING
Warnings and braking action could be
implemented late or not at all if the traffic
situation or external influences mean that
the radar or camera sensor cannot detect a
vehicle in front correctly.
The sensor system has a limited range for
stationary or slow vehicles so the system
provides less effective warnings or no warn-
ings at all at a higher vehicle speed (above
70 km/h) for such vehicles.
Warnings for stationary or slow vehicles
could be disengaged due to darkness.
The collision warning system uses the same
radar sensors as adaptive cruise control. For
more information on the radar sensor and its
limitations, see page 161.
An absent or late warning could mean that
there is no brake support or it comes late.
If warnings are perceived as being too frequent
or disturbing then the warning distance can be
reduced. This would lead to the system warn-
ing at a later stage, which reduces the total
number of warnings.
Camera sensor limitations
The car's camera sensor is used by the three
functions - Collision Warning with Auto Brake,
Driver Alert Control, see page 172 and Lane
Departure Warning, see page 175.
NOTE
Keep the windscreen surface in front of the
camera sensor clean from ice, snow, mist
and dirt.
Do not attach or fit anything to the wind-
screen in front of the camera sensor, as this
could reduce or prevent the function of one
or more camera-dependent systems.
The camera sensors have limitations similar to
the human eye, i.e. they "see" worse in dark-
ness, heavy snowfall or rain and in thick fog for
example. Under such conditions the functions
of camera-dependent systems could be sig-
nificantly reduced or temporarily disengaged.
Strong oncoming light, reflections in the car-
riageway, snow or ice on the road surface, dirty
road surfaces or unclear lane markings could
also significantly reduce a camera sensor func-
tion. Functions such as scanning the carriage-
way and detecting other vehicles for example.
During very high temperatures the camera is
temporarily switched off for about 15 minutes
after the engine is started in order to protect
camera functionality.
V70/XC70 (Y285/Y381); 9; 3 2008-03-25T08:16:38+01:00; Page 169
henrikrosenqvist
170


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