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– For persons with certain clothing, for in-
stance coats.
– With external interference of the ultra-
sound, for instance from passing vehi-
cles or loud machines.
– When sensors are dirty, iced over, dam-
aged or out of position.
– If cargo protrudes.
– Under certain weather conditions such
as high relative humidity, wet condi-
tions, snowfall, extreme heat, or strong
wind.
– With tow bars and trailer couplings of
other vehicles.
– With thin or wedge-shaped objects.
– With moving objects.
– With elevated, protruding objects such
as ledges or cargo.
– With objects with corners and sharp
edges.
– With objects with a fine surface struc-
ture such as fences.
– For objects with porous surfaces.
– Low objects already displayed, for in-
stance curbs, can move into the blind
area of the sensors before or after a con-
tinuous tone sounds.
False warnings
The system may issue a warning under the
following conditions even though there is
no obstacle within the detection range:
– In heavy rain.
– When sensors are very dirty or covered
with ice.
– When sensors are covered in snow.
– On rough road surfaces.
– On uneven surfaces, such as speed
bumps.
– In large buildings with right angles and
smooth walls, for instance in under-
ground garages.
– In automatic vehicle washes.
– Due to heavy exhaust.
– Due to other ultrasound sources, for in-
stance sweeping machines, high pres-
sure steam cleaners or neon lights.
The malfunction is signaled by a contin-
uous tone alternating between the front
and rear speakers. As soon as the mal-
function due to other ultrasound sources
is no longer present, the system is again
fully functional.
With front PDC: to reduce false alarms,
switch off automatic PDC activation on ob-
stacle detection, for instance in vehicle
washes; see Switching on/off.
Malfunction
A Check Control message is displayed in the
instrument cluster.
Red symbol is displayed, and the
range of the sensors is dimmed on
the Control Display.
PDC has failed. Have the system checked by
a dealer's service center or another qualified
service center or repair shop.
Rearview camera
Concept
The rearview camera provides assistance in
parking and maneuvering backwards. The
area behind the vehicle is shown on the
Control Display.
Seite 178
CONTROLS Driving comfort
178
Online Edition for Part no. 01402667273 - VI/19
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