Solutions
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Zmay's post in Activate Automatic Wiper via VCDS was marked as the answerHi. Yes, you can activate via VCDS. It is the same sensor.
Here is how to do it. I did it on my without of problems.
http://www.myturbodiesel.com/wiki/auto-wiper-activation-on-vw-passat-tdi-nms/
If doesent work 1st time, just do it again and it will work.
You can also activate rain closing windows.
Here it is how to do it:
http://www.myturbodiesel.com/wiki/auto-closing-rain-sensing-windows-and-sunroof-on-your-mk5-vw/
Marko