Wondering, if it is an issue or feature: when there isa thin layer of snow on the pavement and you reverse, the sound is as if you hitting someone by the car's back. It may be really thin snow layer.
The feature works in the following way: you reverse and when come closer to the object, car starts to beep and the frequency of beeps is increasing with becoming the sound, never stops, when you hits.
That is the sound, i am hearing now on the snowy roads every time, when i reverse.
Any ideas?

 

I have driven on snow a lot but I saw this only once when the sensors were completely covered with snow and ice. In that case it is expected to hear that permanent sound.

Mikhail

 

Yes, same here. Clear off the sensors and the problem disappears.

 

correct! It helps, when it is not snowing