Rear Defogger Not Working - 1991 190e 2.6 Liter Auto - Mercedes-Benz Forum
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#1 (permalink) Old 11-09-2008, 04:49 PM
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Rear Defogger Not Working - 1991 190e 2.6 Liter Auto

Can anybody with experience, tell me how to diagnose my defogger, Any information is helpful, i dont know even know where to start. The online manual i have is blurry and i cant even read the section with info on the rear defogger.?

Any help is greatly appreciated.
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#2 (permalink) Old 11-09-2008, 05:40 PM
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Check fuse #19.

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#3 (permalink) Old 11-09-2008, 05:50 PM
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Fuse 19 Ok, Checked to see if any power was coming to the switch because it will not even light up, and No power coming from the wires that are connected to the rear defogger switch on dash.
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#4 (permalink) Old 11-10-2008, 12:02 PM
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Is your glovebox light not working as well?
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#5 (permalink) Old 11-10-2008, 12:05 PM
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Yes, the glovebox light is not working. it used to..
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#6 (permalink) Old 11-10-2008, 12:12 PM
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PM'd you back. Posting here for search purposes:

I'll bet you have an aftermarket radio too?

I just found this out this weekend when I did my stereo install.

On the factory stereo harness, there is a hot/12v power wire, color of wire is black and yellow. In the same bundle of wires, there is another wire which is also black and yellow, but I think it's a slightly smaller gauge. Those wires need to be connected together.

I cut off the entire harness plug when I did my install, and just connected the +12v to my headunit, leaving the wire for the rear defroster and glovebox (and who knows what else) disconnected. Once I connected the above mentioned wire to the +12v lead, everything worked again.
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#7 (permalink) Old 11-10-2008, 12:18 PM
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Yes, actually i just installed a stereo and i think glovebox light went out around the same time, not sure though.

This is most likely the problem, i will check now

Thanks man, very very helpful,
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#8 (permalink) Old 11-10-2008, 12:35 PM
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NP. Post back here to let us know if that solved it.
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#9 (permalink) Old 11-10-2008, 02:09 PM
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Problem Solved, I did everything exactly as you described and rear defrost works and so does the glove box light. Thank you for your help
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#10 (permalink) Old 11-10-2008, 06:13 PM
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Cool, glad you got it working.
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