Yup, you're right. Bad news. Plugged in my NT 510, navigated to the correct spot and bingo, got the RR window going down instead of the wipers on low...
I too will send an email to our friends at Foxwell, maybe if enough of us do it will get thier attention. Maybe I should threaten to return it, after all its only about 2 months old. Thought you and everyone else with or contemplating a NT 510/520 should know. I like the unit otherwise but getting windows instead of wipers... that's unacceptable.

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Cal
Tidewater Virginia, USA
2005 X5 3.0i 315,000 miles!