Volvo XC40 Owner's Manual page 336

DRIVER SUPPORT
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CAUTION
Objects such as chains, thin and glossy
poles or low obstacles may end up in the
"signal shadow" and then go temporarily
undetected by the sensors – the pulsating
tone may then unexpectedly stop instead
of becoming a constant tone as expected.
The sensors cannot detect high objects,
such as protruding ramps.
In such situations, pay extra attention
•
and maneuver/drive the vehicle very
slowly or stop the current parking
maneuver – there may be a high risk of
damage to the vehicle or other objects
since information from the sensors is
not always reliable in such situations.
CAUTION
In some circumstances, the Park Assist
System may produce false warnings due to
external sound sources with the same
ultrasonic frequencies as those the system
works with.
Examples of such sources are horns, wet
tires on asphalt, pneumatic brakes, exhaust
noise from motorcycles, etc.
334
NOTE
When a trailer hitch is configured with the
vehicle electrical system, the trailer hitch
protrusion is included when the function
measures the distance to objects behind
the vehicle.
Related information
Park Assist* (p. 331)
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* Option/accessory.