Well, damn me! I was replacing the wiper mechanism a few days back and wondered what that thing was!
The Laird was kind enough to have a spare wiper mechanism lying around which he let me have for liquid reimbursement (yet to be provided!) and as the sensor (as I now know) was attached i didnt bother transferring mine across. I gave him the defective wiper mechanism complete with sensor. So he has a spare if that is a potential source of the problem.
But your problem sounds more like a voltage stability issue than anything else due to moisture or bad (re) connection. The connector has a really strange and fiddly wire retainer which was a bugger to get back on.
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2002 D2 S8 – Ming Blue, Valcona leather, Vavona wood insert, solar sunroof (to be fitted), Heated rear seats, extended leather pack, 18” Avus, ski hatch, Bose, auto dim rear view mirror, rear blind.
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