Hi, I have recollection that I read somewhere, maybe this forum, that the rain sensor will activate and close the windows and sunroof in case the car is left outside and it starts to rain. Maybe it was on my wifes W212.

I was going to test it next time I wash the car

If true then this is news to me. But it would make sense and def' make me love my car even more!

The manuel says the sunroof not the windows