Is the hood closed when you're trying to activate them?
LOL. I had to take off the wipers on my v10 to investigate a brake vacuum issue.
First, I put the wipers back and forgot to put the plastic cover, then I took them off, put the plastic cover, reinstalled the wipers and went around to turn on the wipers, they would not work.
So, I checked all fuses, relays, and ran VCDS; everything was fine.
Removed the wipers and cover again to test the wiper motor, takes a charge just fine.
Put back the plastic cover and wipers.
By this time, I have seen your comment.
CLOSED THE HOOD. Wipers worked perfectly.
Wasted almost a week on this.
LOL.