System limits
Information
WARNING
The system can react incorrectly or not at
all due to the system limits. There is risk of acci‐
dents or risk of property damage. Observe the
information regarding the system limits and ac‐
tively intervene, if needed.◀
Limits of ultrasonic measurement
Ultrasonic measuring might not function under
the following circumstances:
▷ For small children and animals.
▷ For persons with certain clothing, for exam‐
ple coats.
▷ With external interference of the ultra‐
sound, for example from passing vehicles
or loud machines.
▷ When sensors are dirty, iced over, damaged
or out of position.
▷ If cargo protrudes.
▷ Under certain weather conditions such as
high relative humidity, rain, snowfall, ex‐
treme 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 structure
such as fences.
▷ For objects with porous surfaces.
Low objects already displayed, for example,
curbs, can move into the blind area of the sen‐
sors before or after a continuous tone sounds.
False warnings
PDC 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 example, in underground
garages.
▷ In automatic car washes.
▷ Through heavy pollution.
▷ Due to other ultrasound sources, for exam‐
ple, sweeping machines, high pressure
steam cleaners or neon lights.
The malfunction is signaled by a continuous
tone alternating between the front and rear
speakers. As soon as the malfunction 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 obstacle detec‐
tion, for example in car washes, refer to
page 135.
Malfunction
A Check Control message, refer to page 81, 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.
Seite 136
CONTROLS
Driving comfort
136
Online Edition for Part no. 01 40 2 969 276 - II/16
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