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Boston Benz 02-15-2011 12:44 AM

Flashing & inoperative rear defroster switch
RE: my 1995 E320. Yes I know what the owner's manual says about conserving power and redirecting it to other electrical consumers... but my situation doesn't make sense. My alternator is a remanufactured MB/Bosch one that was just done last year (actually removed, rebuilt, and reinstalled a few days later), the voltage regulator was also replaced. The battery is two-years old and gets recharged/equalized about once a month just for the hell of it. This just started happening a few weeks ago for the first time. The defroster switch flashes within 10 seconds of being activated. I've even tried turning everything off for a minute and increasing the RPMs and then turning it back on to see what happens. It still flashes and won't clear the back window. What gives?

mbdoc 02-15-2011 08:17 AM

Can you feel the window getting warm after a few minutes?
Have you checked the FUSE?

Boston Benz 02-15-2011 11:50 AM

Actually, I tried this many times with the window fogged up on the inside (and the outside after a snowstorm). The fuse is intact too. Is there a relay for this?

mbdoc 02-15-2011 12:31 PM

Yes, part of the combination relay. MB number 201 821 02 47

Boston Benz 02-15-2011 03:56 PM

Hmmmm, not good. I proactively replaced that last year when my friend's 1994 E320 suddenly wouldn't start (I think) and we traced it back to that relay. I changed mine to avoid that same fate. I recognized that part number and I still have the MB box that relay came in, that's definitely the one I replaced. What next?

psychwarfare 02-15-2011 04:45 PM

This may or may not help...but could it be the switch/module itself?

I have a Crossfire which of course is quite different (though still MB bits) and generally the consensus is that when a switch behaves in such a fashion it is either the switch/switch module or the (heater) element itself...

babymog 02-15-2011 05:30 PM

If you still have the old relay module, try swapping it back to see if it works.

Otherwise, try a used one, I believe that the same module was widely used throughout the 124/126/201 models.

Boston Benz 02-17-2011 11:13 PM

I'll try swapping it back to the old one to see what happens. Thanks.

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