Functional requirement of the
ultrasonic sensors
The areas of the ultrasonic sensors are clean and
clear.
For further information:
▷ Washing the vehicle, see page 375.
▷ Vehicle care, see page 376.
System limits of the ultrasonic
sensors
The physical limits of ultrasound measurement
may be reached when detecting objects in situa‐
tions involving the following, for example:
▷ If the sensors are contaminated.
▷ If the sensors are obscured, for example by
stickers.
▷ If the sensors are misaligned, for example due
to parking damage.
▷ After work performed incorrectly on the vehi‐
cle paintwork near to the sensors.
▷ Small children and animals.
▷ Persons wearing certain types of clothing, for
example a coat.
▷ Obstacles and people at the edge of the driv‐
ing lane.
▷ If there is external interference with the ultra‐
sonic sound, for example by passing vehicles,
loud machines or other ultrasonic sources.
▷ Certain weather conditions; for example, high
humidity, wet conditions, snowfall, cold, ex‐
treme heat or strong wind.
▷ Trailer drawbars and tow hitches of other ve‐
hicles.
▷ Thin or wedge-shaped objects.
▷ Moving objects.
▷ Higher protruding objects, for example pro‐
jecting walls.
▷ Objects with corners, edges and smooth sur‐
faces.
▷ Objects with fine surfaces or structures, for
example fences.
▷ Objects with porous surfaces.
▷ Small and low objects such as boxes.
▷ Low objects already displayed, for example,
kerbs, can be outside of the detection ranges
of the sensors.
▷ Soft obstacles or obstacles covered in foam.
▷ Plants or shrubs.
▷ In washing bays and car washes.
▷ On uneven surfaces, for example speed
bumps.
▷ In the presence of dense exhaust fumes.
▷ The ultrasonic sensors do not take into ac‐
count loads projecting beyond the outline of
the vehicle.
A Check Control message may be displayed if
the system limits are reached.
Seite 51
Sensors in the vehicle
CONTROLS
51
Online Edition for Part no. 01405A38CB9 - VI/21
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