1995 E300D windows, sunroof, seat electrical problem - Mercedes-Benz Forum

 
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post #1 of 8 (permalink) Old 07-15-2013, 11:48 AM Thread Starter
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1995 E300D windows, sunroof, seat electrical problem

In the past 3 weeks I've had the engine compartment wiring harness replaced, fuse panel cleaned, and all the fuses replaced. Now the electric sunroof, electric windows,and electric seats work intermittently. If they work they work fine. If they don't,there is no noise; they just don't work.

Three weeks ago, the car would not start so it was towed to a repair shop. The mechanic got it running by cleaning the fuse panel and replacing the fuses. While he was working on the car I asked him to repair the aux fan which was not functioning. He repaired a few wires and got it working, but told me I needed to replace the engine wiring harness. Over the next week I checked this forum, agreed, and made an appointment for the harness. During that week the sunroof and windows started to malfunction. The wiring harness got replaced, but I needed the car for the weekend and he did not not have time to fully troubleshoot the sunroof and window problem. During the weekend the seats started the same intermittent malfunction. Any ideas?
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post #2 of 8 (permalink) Old 07-15-2013, 12:27 PM
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Everything you describe suggests the convenience relay located in the covered area behind the fuse box. The aux fan relays and their associated relay protection fuses are in there too. Convenience relay could be failing, loose in the socket or the socket could be corroded. No coincidence, I think.

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post #3 of 8 (permalink) Old 07-16-2013, 02:45 PM
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I am having a similar problem which now includes all of the dash warning lights illuminating and staying on. I replaced the alternator and had it bench tested and its fine. Any suggestions?
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post #4 of 8 (permalink) Old 07-16-2013, 03:41 PM
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I am having a similar problem which now includes all of the dash warning lights illuminating and staying on. I replaced the alternator and had it bench tested and its fine. Any suggestions?
Most likely the fuses, especially fuses 5, 6, 7 & 9. Check them all by removing and inspecting. Clean the fuse contacts. The best thing is to replace them all with the all-copper fuses. It could also be the OVP relay, but I would start with the fuses.

Floobydust: a contemporary term derived from the archaic Latin miscellaneous, whose disputed history probably springs from Greek origins (influenced, of course by Egyptian linguists) - meaning here "a mixed bag." - National Semiconductor Audio Handbook
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post #5 of 8 (permalink) Old 07-16-2013, 04:56 PM
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Anyone know of an experience 500E mechanic in the OC area of CA?

Thanks, I'll tell my mechanic to replace the fuses as you suggest.

I have had difficulty finding a mechanic who truly has experience with my 1993 MBZ 500E. All MBZ technicians say they can work on it as other MBZ however the 500E is similar yet different. Dealerships have had difficulty diagnosing simple problems and after a $9,000.00 service bill they could not figure out the air bag brushes were in need of cleaning.

Anyone have a recommendation of someone who truly knows this car?

Thanks to all of the good people on this site....
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post #6 of 8 (permalink) Old 07-16-2013, 05:28 PM
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Gerry Van Zandt is the man you need to hook up with, do a search on the net....
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post #7 of 8 (permalink) Old 07-16-2013, 05:41 PM
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Heh heh heh...Gerry. Tell him I sent you. 500Eboard Galactic HQ

lol
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post #8 of 8 (permalink) Old 07-17-2013, 02:18 AM
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Quote:
Originally Posted by Floobydust View Post
Everything you describe suggests the convenience relay located in the covered area behind the fuse box. The aux fan relays and their associated relay protection fuses are in there too. Convenience relay could be failing, loose in the socket or the socket could be corroded. No coincidence, I think.
isn't there also a convenience module under the rear seat on the drivers side? that might be something to check if the relay doesn't fix it

1990 300TE 4MATIC Japanese-spec - 74,000 mi
1995 E300 Diesel - 327,000 mi
1983 250 German-spec - 227,000 mi
1992 400E
1994 E320 Wagon
1990 300E 2.8
1988 300CE Lorinser
1988 300TE
1990 300E
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