S500 W140 windows/sunroof stopped working - Mercedes-Benz Forum
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#1 (permalink) Old 01-22-2009, 05:10 PM
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S500 W140 windows/sunroof stopped working

Help! My S500 W140 suddenly stopped working the windows up/down and opening the sunroof from the switches or the remote. Even the mirror adjust stopped working from the switch on the console but when the door is open and the seat memory is pressed the mirrors move to the designated position. It's weird. The fuses are fine - checked 'em all. Is there another relay or a solution someone knows of?
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#2 (permalink) Old 01-22-2009, 05:56 PM
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How is your battery doing? Low batteries can cause really strange problems like this.
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#3 (permalink) Old 01-23-2009, 12:00 PM
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The battery is fine.
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#4 (permalink) Old 01-23-2009, 01:06 PM
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What year car is this and where are you located? Complete your profile.
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#5 (permalink) Old 01-23-2009, 03:35 PM
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!994 S500. Located in Scottsdale, Arizona.
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#6 (permalink) Old 01-23-2009, 06:13 PM
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Have you replaced the wiring harness yet? If not, then I'd bet you have shorting.
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#7 (permalink) Old 01-23-2009, 08:02 PM
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I had this problem once. The control box is in the trunk on the right rear fender/ panel. Didn't need to replace the box, cause the the wiring was loose. I have a 99 420.Yours might be someplace else.
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#8 (permalink) Old 01-24-2009, 04:28 AM
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500s and 600s have a design defect, where the engines are so hot, they ultimately melt the wiring harness causing electrical difficulties. Its a common problem ive heard... if it hasnt been replaced since manufacture, that might be a good place to start.
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#9 (permalink) Old 01-24-2009, 08:03 AM
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I feel the problem is not as severe as requiring the wiring harness to be replaced. I think I caused the problem when I locked the doors and closed the sunroof using the remote control. Right after that the windows and sunroof would not operate from the switches even though the fuses are fine. I am sure I have tripped a relay somewhere.
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#10 (permalink) Old 01-24-2009, 03:51 PM
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Well... you never answered the question. Has your wiring harness been replaced or not? This was a design defect on all W140 made between 1991 and mid 1996 depending on the market. Replacement is not an option, rather a requirement.
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