Volvo XC40 Owner's Manual page 286

DRIVER SUPPORT
Camera/radar sensor limitations
The camera and radar sensor used by several
of the driver support functions has certain
limitations, which also affect the functions
using the camera and radar sensor. The driver
should be aware of the following limitations:
Camera and radar
Obstructed camera
The area marked in the illustration must be cleaned
regularly and kept free of decals, objects, solar film,
etc.
Cause
The area of the windshield in front of the camera/radar sensor is
dirty or covered by ice or snow.
Thick fog, heavy rain or snow is blocking the radar signals or the
camera's range of visibility.
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The camera is located on the upper interior
section of the windshield along with the radar
sensor.
Do not place, affix or mount anything on the
inside or outside of the windshield, or in front
of or around the camera and radar sensor –
this could disrupt camera and radar-based
functions. It could cause functions to be
reduced, deactivated completely or to produce
an incorrect function response.
If this symbol and the message
" Windscreen sensor Sensor
blocked, see Owner's manual
displayed in the instrument panel, it
means that the camera and radar sensor are
unable to detect other vehicles, cyclists,
pedestrians and large animals in front of the
vehicle and that the vehicle's camera and
radar-based functions may be obstructed.
Action
Clean the windshield in front of the camera/radar sensor and remove dirt, ice
and snow.
No action. Heavy precipitation may sometimes prevent the camera/radar sensor
from functioning.
The following table shows some of the situa-
tions that can cause the message to be dis-
played, and suggested actions:
" is