Chery A1 2008 Operating Instructions Manual page 53

INTRODUCTION OF FUNCTIONS AND DESCRIPTION OF INDICATIONS OF THE VEHICLE
The high pressure water flow
from a hydraulic giant or similar or
larger external force may result in
failure.
The surface of radar probe must
never be pressed, squeezed
impacted.
In the event that the alarm sound is not
given off even if the probe approaches the
obstacle, the following points should be
checked:

Whether snow or mud adheres to the
surface of radar probe or not?

Whether the surface of radar probe is
frozen or not?

Whether the car is not operated for a
long period during hot or cold
season or not?
If the above points are not available,
please drive the car to the authorized
CHERY service station for check and
repair.
The probe of the radar may
or
not work below -30℃ or above 80℃.
In the case of the following instances,
the alarm sound is not given off even if
the radar probe approaches the obstacle,
attention should be paid to them: