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System limits
Safety information
WARNING
The system can react incorrectly or not
at all due to the system limits. There is a risk of
accidents or risk of property damage. Observe
the information regarding the system limits
and actively intervene, if needed.◀
Limits of ultrasonic measurement
Ultrasonic measurements might not function in
the following situations:
▷ For small children and animals.
▷ For persons with certain clothing, e.g.,
coats.
▷ With external interference of the ultra‐
sound, e.g., from passing vehicles or loud
machines.
▷ When sensors are dirty, iced over, dam‐
aged or out of position.
▷ 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, edges, and
smooth surfaces.
▷ With objects with a fine surface structure
such as fences.
▷ For objects with porous surfaces.
▷ If cargo protrudes.
▷ With small and low objects, e.g., boxes.
▷ With obstacles and persons at the edge of
the lane.
▷ With soft obstacles or obstacles covered in
foam material.
▷ With plants and bushes.
▷ Low objects already displayed, e.g., curbs,
can move into the blind area of the sensors
before or after a continuous tone sounds.
▷ Cargo that extends beyond the perimeter
of the vehicle is not taken into account by
the system.
False warnings
The system may issue a warning under the fol‐
lowing conditions even though there is no ob‐
stacle 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, e.g., in underground ga‐
rages.
▷ In automatic vehicle washes.
▷ Due to heavy exhaust.
▷ Due to other ultrasound sources, e.g.,
sweeping machines, high pressure steam
cleaners or neon lights.
If necessary, switch off automatic PDC activa‐
tion on obstacle detection, e.g., in vehicle
washes to reduce false alarms, refer to
page 186.
Malfunction
A Check Control message is displayed.
White symbol is displayed, and the
range of the sensors is dimmed on the
Control Display.
PDC has failed. Have the system checked.
Seite 189
Driver assistance systems Controls
189
Online Edition for Part no. 0140 2 974 740 - VI/16
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