Mercedes-Benz 2012 A-Class Owner's Manual page 200

Driving systems
198
Blind Spot Assist is only an aid. It may fail to
detect some vehicles and is no substitute for
attentive driving.
General notes
Blind Spot Assist uses a radar sensor system
to monitor the areas on both sides of your
vehicle. It supports you from speeds of
30 km/h. A warning display in the exterior
mirrors draws your attention to vehicles
detected in the monitored area. If you then
switch on the corresponding turn signal to
change lane, you will also receive an optical
and audible collision warning. For this pur-
pose, Blind Spot Assist uses sensors in the
rear bumper.
The radar sensor system is switched off auto-
matically in the vicinity of radio telescope
facilities ( Y page 350).
For Blind Spot Assist to assist you when driv-
ing, the radar sensor system must be:
activated( Y page 223)
R
operational
R
i In some countries you must deactivate
the radar sensor system (
For further information about the radar sen-
sor system; see (
Monitoring range of the sensors
In particular, the detection of obstacles can
be impaired in the case of:
dirt on the sensors or anything else cover-
R
ing the sensors
poor visibility, e.g. due to fog, heavy rain or
R
snow
a narrow vehicle travelling in front, e.g. a
R
motorcycle or a bicycle
very wide lanes
R
narrow lanes
R
vehicles not driving in the middle of their
R
lane
barriers or other road boundaries
R
Vehicles in the monitoring range are then not
indicated.
Y page 223).
Y page 350).
Blind Spot Assist monitors the area up to
3.0 m behind your vehicle and directly next to
your vehicle, as shown in the diagram. For this
purpose, Blind Spot Assist uses radar sensors
in the rear bumper.
If the lanes are narrow, vehicles driving in the
lane beyond the lane next to your vehicle may
be indicated, especially if the vehicles are not
driving in the middle of their lane. This may
be the case if the vehicles are driving on the
inner side of their lane.
Due to the nature of the system:
warnings may be issued in error when driv-
R
ing close to crash barriers or similar solid
lane borders.
warnings may be interrupted when driving
R
alongside particularly long vehicles, for
example lorries, for a prolonged time.
The two sensors for Blind Spot Assist are
integrated into the sides of the rear bumper.
Make sure that the bumper is free of dirt, ice
or slush in the vicinity of the sensors. The
radar sensors must not be covered, for exam-
ple by cycle racks or overhanging loads. Fol-
lowing a severe impact or in the event of dam-
age to the bumpers, have the function of the
radar sensors checked at a qualified special-
ist workshop. Blind Spot Assist may other-
wise not work properly.