What is this relay for? - Mercedes-Benz Forum

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post #1 of 16 (permalink) Old 01-24-2015, 11:14 AM Thread Starter
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What is this relay for?

Hi all
Can anyone tell me what this relay is for? Its located on the engine bay bulkhead passenger side in a row of three. two round one square.
The one I have is not working.
Thanks John.
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post #2 of 16 (permalink) Old 01-25-2015, 04:43 AM
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Mercedes uses those round in a bunch of applications. Can you take a pic of where it came from? Are your electric windows working?
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post #3 of 16 (permalink) Old 01-25-2015, 10:31 AM
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The one closest to the fender is for the electric windows. I'll try to figure out what the other one does.
Will
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post #4 of 16 (permalink) Old 01-25-2015, 07:50 PM Thread Starter
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Here you go. My windows all work fine by the way. I have had a lot of trouble trying to locate one of these relays.
Thanks Guys.
John.
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post #5 of 16 (permalink) Old 01-26-2015, 05:43 AM
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what are the PN's on your old relay?
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post #6 of 16 (permalink) Old 01-26-2015, 09:24 AM
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from left to right , electric windows , ignition change over , separation relay for a/c aux fan and ignition change over .
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post #7 of 16 (permalink) Old 01-26-2015, 10:47 AM
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Wroding, if you're ok with used relays, do a general eBay search for the things. Mercedes used these same relays across all their models of like-year. I started to amass a collection of the things before I sold my car.
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post #8 of 16 (permalink) Old 01-26-2015, 11:26 PM Thread Starter
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Thats strange? As you can see the left one is out but windows are working. As far as pn's are you asking for the numbers on the case of the relay? l will check in the morning.
Im fine with used relays as long as they are working. Do you have any for sale?
Thanks Everyone.
Cheers John
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post #9 of 16 (permalink) Old 01-27-2015, 09:33 AM
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Quote:
Originally Posted by wroding View Post
Thats strange? As you can see the left one is out but windows are working. As far as pn's are you asking for the numbers on the case of the relay? l will check in the morning.
Im fine with used relays as long as they are working. Do you have any for sale?
Thanks Everyone.
Cheers John
That is strange. On my 4.5 the left one does the windows. I removed it and they stopped working, plus from your picture the left plug has heavy gauge red wire which looks identical to mine.
Will
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post #10 of 16 (permalink) Old 01-27-2015, 11:21 AM
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Quote:
Originally Posted by wroding View Post
Im fine with used relays as long as they are working. Do you have any for sale?
I'd give them to you if I had any left. When I sold the car, EVERYTHING went with it...

But in watching eBay, I found single and lots that were very reasonable. New, these things will go for upwards of $100. Used, $5 to $15 (at least, such was my limit)...
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