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  #1  
Old 08-28-2007, 08:51 PM
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W140 Wiper Problems

I Have A 92 W140 And My Wipers Only Work When They Feel Like Working.i Tried Wiper Relays From 2 Other Cars And It Did The Same Thing. Also Tried A Different Stork On Column. Does Anyone Know Of More Conponents To This System Besides The Relay,motor Or Column Switch? Any Help Would Be Appreciated

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  #2  
Old 08-29-2007, 08:59 AM
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Did you try both the wiper relay on top of the fuse box & the combination relay INSIDE the fuse box??
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  #3  
Old 08-29-2007, 11:36 AM
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No, I Am Not Sure Which One Is The Combination Relay
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  #4  
Old 08-12-2008, 07:21 PM
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Did you every find an answer? I have 93 300sd with a similar problem and with the suggestion to replace the relay. How does one test the relay?
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2001 ML320
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  #5  
Old 08-13-2008, 09:15 AM
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Relay is black-box - no way to test it far as I know.

They're quite a few bucks from the dealer, but do show up from time-to-time on e-bay.

If there are problems with the combination relay, I would think that the problems would affect other systems besides the wipers - but maybe not.

I my case, the wiper relay was the issue. Sits on top of the fuse box lid - less than 5 minutes to R&R.

Board member Eddie A is parting a pair of 140s - I'll bet he has one or more wiper relays for sale. Good fellow to deal with - prompt shipper and reasonable prices.

Last edited by wbrian63; 08-13-2008 at 09:25 AM.
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  #6  
Old 08-16-2008, 12:24 PM
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Thanks to everyone for their help. I bought a new wiper relay from the Fast Lane and will be installing it later today.
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1993 300SD (286k + miles)
2000 SL500
2001 ML320
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  #7  
Old 08-17-2008, 11:58 AM
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w140 Wiper Relay

I bought a new relay from the Mercedes Shop.

When I replaced the original, I noticed that there was a small amount of corrosion on the connetors which I cleaned with a toothbrush.

Perhaps the relay itself is okay but I changed it anyway. I am keeping the old one as an emergency part because it worked 95% of the time and I commute about 200 miles each way.

Easy replacement: Open the fuse box lid, slide the relay toward you and lift. Finally pull out the connectors and inspect, etc.

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2001 ML320
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