Not sure if this is worthy of a DIY...but this fixed my wiper problems that refused to work on the low setting. It was very intermittent, but very irritating as I didn't need the wipers going all the time in a drizzle of rain.

Thanks to vanweik over at mbworld for sending me in the direction.

Tools needed:

• 1x Philips Screwdriver
• 1x Small Flathead screwdriver
• Soldering Iron
• 10 Minutes of your time.

First find the culprit!

Multi-Purpose Relay/Combination Relay:


Remove the 6 screws...4 on the relay side, 2 below the fuses and remove cover. Remove from the relay from the slot...no tools needed.



Now you have it out:



Pop it open using the small flathead and look at the connections carefully.
On mine, you can see at the top right there were cracks and it didn't look a clean connection so using the soldering iron just touched it up.



Close her up...pop her back in and cross your fingers!

My wipers work perfectly now.

Alternatively, if this does not work, you can purchase a new one.
http://catalog.peachparts.com/

Hope this helps a few people if anybody comes across this problem.

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
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2003 Gray Mercedes ML350 - 122k