Autidimming mirror doesn't work. Anyway to fix it?

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Autidimming mirror doesn't work. Anyway to fix it?

Postby NewtownLSC » Mon Apr 17, 2017 7:32 am

My autodimming rearview mirror does not work. I have tested that it has functional power supply.

Is it any way possible to check and fix the mirror itself or must it be replaced with NOS or a functional one?

Is it simply too old or is there some known weakness causing this?
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Re: Autidimming mirror doesn't work. Anyway to fix it?

Postby K MANIAC » Mon Apr 17, 2017 1:52 pm

What year model do you have? The early autodimming mirrors are different from the later autodimming mirrors.
"This car may be old, but it will still climb Kirker Pass at 110!"- quote of the original owner of my green 1964 Chrysler 300-K

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1989 Mark VII LSC (Sandstone Metallic)
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Re: Autidimming mirror doesn't work. Anyway to fix it?

Postby TwoTimeSC » Mon Apr 17, 2017 7:30 pm

In the early electro-mechanical ones, there is a small DC motor whose armature wires corrode and break.
Once that happens, auto dimming fails.
I have repaired about a dozen for various people and in every case, that was the cause of failure.

I cannot speak for the newer, electro-chromic ones.

-Paul
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Re: Autidimming mirror doesn't work. Anyway to fix it?

Postby NewtownLSC » Fri Apr 21, 2017 12:23 am

My car is 1989 model. Does it qualify for earlier model?
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Re: Autidimming mirror doesn't work. Anyway to fix it?

Postby 2manymarks » Fri Apr 21, 2017 8:34 am

NewtownLSC wrote:My car is 1989 model. Does it qualify for earlier model?


Not sure what you mean by "qualify", but the 89 models did offer the self dimming electronic mirrors as an option (one of the very few options on these models). They are the heaviest rear view mirrors offered and were sometimes problematic in that respect. I have had a few Mark VIIs that had them including my 89LSC and 87BB. I have never tried to repair one. 8-)
As of June2016,[code][/code] 10Mark[*] VII's, 3licensed for the road:
1989 Midnight/Current Red c/c (9G) mostly stock99k.
1989 Current Red c/c (9G) 124k, mostly stock, needs airsuspension & bodywork.
1989 Light Titanium c/c (11) BillBlass-stock. miles unk
1989 Medium Sandalwood (62) Mass air+ 111k FOR SALE $900.
1986 BB(8T)stock125k(wife'sDD)
1987 BB (4L)stock(miles unk)under repair.
1984 TurboDiesel Base model,Platinum(1Q),131k+ FOR SALE $1000.
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Re: Autidimming mirror doesn't work. Anyway to fix it?

Postby TwoTimeSC » Sat Apr 22, 2017 5:11 pm

Yes, the 1989 auto-dimming mirror is the "earlier" type with the little electric motor in it that typically fails.
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Re: Autidimming mirror doesn't work. Anyway to fix it?

Postby NewtownLSC » Thu Apr 27, 2017 2:14 pm

I have Mark VII 1989 Shop Manual (bought from eBay). There are instructions how to test the mirror and if it fails, simply "replace the mirror".

Is there anywhere instructions how to open the mirror and fix the electric motor or replace it?
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