Auto dimming mirror not... dimming.
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This is a discussion on Auto dimming mirror not... dimming. within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; Searched the interwebs and couldn't find a solution. The dimming function of the rear view mirror on my car doesn't ...

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    Registered User Soobvirgin's Avatar
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    Auto dimming mirror not... dimming.

    Searched the interwebs and couldn't find a solution. The dimming function of the rear view mirror on my car doesn't seem to be working anymore. I've tried turning it off and wiping both the front and rear sensors but to no avail. The car's only just turned two years old, so is still under warranty. It's due for a service, so I can ask the dealer to look at it when it goes in, but just wondering if anyone had heard of this before and if there was a quick fix.

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    Registered User Nayrb37's Avatar
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    The mirror in my 2010 Impreza (not WRX) died after about 2 years. It was a lease, so it didn't really matter to me. Some basic troubleshooting that you may have already thought of this, but just in case you didn't.

    Does the compass on the mirror and green light still work? If not, the mirror isn't getting power or is dead. If this is the case, pop out the dome light console and check the wiring harness/plug connected to mirror, also check for a blown fuse.

    Have you attempted to "force" the mirror dim by holding a flashlight in front of the sensor at night? This will basically make the mirror to dim on demand, and you'll easily be able to see if the mirror is dimming at all, or just slightly. Most likely it needs to be replaced, but just something you can tell the service department.

    I wouldn't tell the service department about removing the dome light (if you try that) because some dealers look for any reason to screw you out of warranty coverage.
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    Registered User Soobvirgin's Avatar
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    Yes, the compass and green light still work. I hadn't tried a flashlight yet though. Thanks, I'll give it a go tonight and see what happens.

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    \_(ツ)_/ Rambo's Avatar
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    My guess is the LCD that dims the mirror burned out. Is the car kept in a hot area?

    My bugeye mirror burned out. My Outback's is still going strong though.
    Isaac -- 2003 WRX sedan Stg II - Gave its life for mine 6/2013.
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    Registered User Soobvirgin's Avatar
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    Quote Originally Posted by Rambo View Post
    My guess is the LCD that dims the mirror burned out. Is the car kept in a hot area?

    My bugeye mirror burned out. My Outback's is still going strong though.
    Yes, it is. The edge of the desert and never garaged.

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    Registered User Nayrb37's Avatar
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    Any luck figuring out the issue?
    2014 Subaru WRX WRB Stage 1
    Stink-Eye Mob # 1.618

    Previous Vehicles: 2010 Subaru Impreza 2.5i; 1997 Ford Mustang Cobra; 1998 Audi A4 1.8T; 1995 Ford Mustang
    A turbo: exhaust gasses go into the turbocharger and spin it, witchcraft happens and you go faster. - Jeremy Clarkson

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    Registered User Soobvirgin's Avatar
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    Quote Originally Posted by Nayrb37 View Post
    Any luck figuring out the issue?
    Well, I completely failed to remember to test it at night for 2 nights in a row. Then I had to work late last night and on the way home in the dark, it was working. So I have no idea what changed or whether it will continue to work. I'll have to wait and see. I'll update if anything changes. Thanks for your help.

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    OMG WTF MainFrame's Avatar
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    Auto dimming mirrors are junk.. in my experience, they won't last more than a couple of years. The solution.. get a standard mirror.

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    Registered User Soobvirgin's Avatar
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    Quote Originally Posted by MainFrame View Post
    Auto dimming mirrors are junk.. in my experience, they won't last more than a couple of years. The solution.. get a standard mirror.
    Really? That's disappointing. I don't know that it definitely needs to be replaced yet, but I'll stick with it for as long as Subaru will replace it under warranty

  11. #10
    \_(ツ)_/ Rambo's Avatar
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    Quote Originally Posted by MainFrame View Post
    Auto dimming mirrors are junk.. in my experience, they won't last more than a couple of years. The solution.. get a standard mirror.
    I disagree.

    Quote Originally Posted by Soobvirgin View Post
    Really? That's disappointing. I don't know that it definitely needs to be replaced yet, but I'll stick with it for as long as Subaru will replace it under warranty
    Like any LCD, they don't like extreme heat. Think of the mirror as a one-pixel LCD display. If you leave a cheap calculator in the sun all day, the crystal will melt away from the display. Sometimes it will come back after cooling down, but over time it will degrade. Living in TX or San Diego is probably a harder environment than most on the mirror.

    Even in Oregon, I use a sun reflector in the windshield if the car is in the sun all day. All the windows in the Outback make it an oven in the summertime without the reflector.
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  12. #11
    Registered User Soobvirgin's Avatar
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    Quote Originally Posted by Rambo View Post
    Even in Oregon, I use a sun reflector in the windshield if the car is in the sun all day. All the windows in the Outback make it an oven in the summertime without the reflector.
    I actually use a reflector in the windshield religiously. I think it helps. But not much. In 90 - 110 heat, the car is still an oven with the reflector in. I'm sure the color doesn't help.

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