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Old 10-21-2003, 04:21 PM
xa0ax's Avatar
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Join Date: Aug 2003
Location: Houston, TX
Posts: 6
Haunted Windshield Wiper

Great site!! A lot of resources. Keep it up guys!

Did a search but I didn't find any thing close to my wiper roblem. The car in question is a 91 300D. If I park it under the sun for 2-3 hours (93+ F ) when I start the car and the wiper will start moving on its own at a normal speed for about 10 minutes regardless the switch is at its OFF position. After a while it will repeat again. I tried to turn it on and off and sometime it worked. It will stop sooner if I push that level and apply some windshield fluid(hate to see that wiper moving on yop of a dry windshield). is it a faulty park mechanism or a bad switch? Has anyone got this problem before? Is the mechanism in the wiper transmission case or in the motor?


91 300D
87 300SDL
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Old 10-21-2003, 05:14 PM
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
Your car uses a multi-function relay that controls the w/s wipers.
Next time that happens try removing that relay & see if the motor will park. IF so the relay is the problem, if not then the motor must be at fault.

That relay lives in the rear section of the fuse/relay box.
LOOK for MB part number 201-821-02-47, should be the 2nd largest computer in that area.
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Old 10-22-2003, 01:17 AM
xa0ax's Avatar
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Join Date: Aug 2003
Location: Houston, TX
Posts: 6
Thanks! M.B. DOC I'll have to wait until next summer. it only happens when outside temp is in mid 90s F
91 300D
87 300SDL
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