SOLVED: w201 wiper wont park properly. replaced relay and stalk.
 

My wiper stops randomly when I shut it off. Also in intermittent mode, it only goes about a third of the way across the windshield before it stops. High and low work perfectly. It doesn't seem like a mechanical problem, but rather an electrical one.

The kicker is that I've changed both the relay and the stalk. I used the relay from my w124 that is known to be working, and I bought a stalk on ebay, which could very well have the same problem, but looks way less worn than the one that I changed.

Are there any other possibilities? Is there a contact on the mechanism that tells it when its in the correct position that maybe I could clean off? My problem is all over the internet, but it always ends up being the relay or the stalk.

Does anyone have an electrical diagram of the wiper system?

Not the wiper motor or relay - what else? - Benzworld.org - Mercedes-Benz Discussion Forum


I found this. There is something called an impulse switch soldered onto the motor. Anyone have any experience with this?

SOLVED!!! I did some exploratory surgery on an old w124 wiper motor to see how it worked. The grease must have become conductive or something. I cleaned the grease off, added new dielectric grease and reassembled. Hopefully this thread will some someone else some money.