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Old 02-15-2011, 01:44 AM
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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?

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Old 02-15-2011, 09:17 AM
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Can you feel the window getting warm after a few minutes?
Have you checked the FUSE?
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Old 02-15-2011, 12:50 PM
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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?
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Old 02-15-2011, 01:31 PM
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Yes, part of the combination relay. MB number 201 821 02 47
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44 years foreign automotive repair
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190E 2.3 16V ITS SCCA race car (sold)
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Old 02-15-2011, 04:56 PM
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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?
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Old 02-15-2011, 05:45 PM
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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...
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Old 02-15-2011, 06:30 PM
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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.
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Old 02-18-2011, 12:13 AM
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I'll try swapping it back to the old one to see what happens. Thanks.

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