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System limits
Safety information
WARNING
The system can react not at all, too late, incor‐
rectly, or without justification due to the system
limits. There is a risk of accidents or risk of
damage to property. Follow the information re‐
garding 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, for instance
coats.
▷ With external interference of the ultrasound,
for instance from passing vehicles or loud
machines.
▷ When sensors are dirty, iced over, damaged
or out of position.
▷ Under certain weather conditions such as
high relative humidity, wet conditions, snow‐
fall, 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.
▷ With objects with corners, edges, and
smooth surfaces.
▷ With objects with a fine surface structure
such as fences.
▷ For objects with porous surfaces.
▷ With small and low objects, for instance
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, for instance
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 obsta‐
cle 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 underground ga‐
rages.
▷ In automatic vehicle washes.
▷ Due to heavy exhaust.
▷ Due to other ultrasound sources, for instance
sweeping machines, high pressure steam
cleaners or neon lights.
To prevent false alarms, switch off automatic
PDC activation on obstacle detection, refer to
page 213, for instance in automatic vehicle
washes.
Malfunction
A Check Control message is displayed.
White symbol is displayed, and the range
of the sensors is dimmed on the Control
Display.
Seite 216
CONTROLS
Driver assistance systems
216
Online Edition for Part no. 01402722630 - VI/18
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