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Discussion Starter · #1 ·
my 85 300SD driver and right rear window will no longer operate. I have changed the fuses and stil no luck. Anyone with similar problems? Thanks in advance
 

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Depends on the day!
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13,337 Posts
try swapping around the switches... IF that doesn't do it, something in your wiring fried :-/

Jonathan
 

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BenzWorld W126 & W201 Host
1988 420SE, 2002 C180 Kompressor, 200 ML320
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1,159 Posts
They are fused diagnally so wiring would be the obvious choice.

Does the interior light dim when you press either of the switches?
 

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Discussion Starter · #4 ·
Lights don't appear to dim when either switch is pressed. So this sounds like a wiring issue I have? Costly fix I assume?
 

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BenzWorld W126 & W201 Host
1988 420SE, 2002 C180 Kompressor, 200 ML320
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1,159 Posts
Take the fuse out and check the ends of it, the alloy corrodes and loses it's contact.
 

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BenzWorld W126 & W201 Host
1988 420SE, 2002 C180 Kompressor, 200 ML320
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1,159 Posts
Have you tried Jonathans suggestion of swpping the switches from the working windows?
 

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80 280SL, 85 300SD, 87 300TD, 90 300TE 4Matic, 90 300D 2.5 Turbo, 92 300D 2.5 Turbo, 92 300TE 4Mat
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1,480 Posts
Ensure your motor is working. Run wires directly to the motor contacts (you'll have to remove the door panel to access them). If your motor is bad you can replace it with a used one for $35.00 from mercedesdismantlers.com . Just make sure you get the right motor with the same number of teeth. I got a couple of motors without any problems.
 

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1982 300SD
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692 Posts
Probably not related to the problem under discussion, but another failure mode for power windows.
I have disassembled '82 330SD for repaint. I also had a window problem that I must repair to pass inspection. The plastic piece that pushes the window up, and pulls it down was broken. ( Piece is on the end of the regulator arm and slides in the channel along the bottom of the window.) Further investigation found that the rubber-like pad that is glued to the door skin had peeled away from the door at its top edge. When the window came down, it hit the ( very stiff) edge and stopped the window from moving. The motor kept running broke the plastic piece.
If you have your doors apart, you may want to shine some light in there and see if the pad is secure.
 
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