Limits of ultrasonic measurement
The detection of objects with ultrasonic meas‐
urements can run into physical limits, e.g., in the
▷ For small children and animals.
▷ For persons with certain clothing, for instance
▷ With external interference of the ultrasound,
for instance from passing vehicles or loud
▷ 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
▷ With thin or wedge-shaped objects.
▷ With moving objects.
▷ With elevated, protruding objects such as
▷ With objects with corners, edges, and
▷ With objects with a fine surface structure
such as fences.
▷ For objects with porous surfaces.
▷ With small and low objects, for instance
▷ With obstacles and persons at the edge of
▷ With soft obstacles or obstacles covered in
▷ 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
▷ Cargo that extends beyond the perimeter of
the vehicle is not taken into account by the
▷ Parking spaces that are not suitable may be
detected or suitable parking spaces may not
be detected at all.
A Check Control message is displayed.
The parking assistant failed. Have the system
checked by a dealer's service center or another
qualified service center or repair shop.
Cross traffic warning
At blind driveways or when driving out of diago‐
nal parking spaces, approaching cross traffic is
detected sooner by the system than is possible
from the driver's seat.
Two radar sensors in the rear bumper monitor
the area behind the vehicle.
The system indicates approaching traffic.
Depending on the vehicle equipment, the traffic
area in front of the vehicle is monitored as well.
Two additional radar sensors are located in the
Driver assistance systems
Online Edition for Part no. 01405A10E93 - VI/20