I have a 96 C280 that had a monowiper with similar issues. It ultimately deteriorated to being unable to stop the wiper blade without turning off the car. I tried replacing the combination switch a couple of times (you would think that I would learn, but this happened over the course of several years and a couple of different dealerships/garages...). The problem for me was not the combination switch but the relay that is located within the main fuse box. Have a look at the following site for the illustrated repair.
http://forums.mercedesclub.org.uk/showthread.php?t=62702 The repair suggests taking apart the relay to find the soldered connections that have deteriorated over the years. I found it really difficult to spot the defective connection(s). In the end, I just used a very hot soldering iron on all the connections in the area suggested by the repair. Bob _______________________________________ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
