E46 Touring Electrochromatic rear view mirror

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  1. E46 Touring Electrochromatic rear view mirror *FIXED* 
    #1
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    jad70's Car Details
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    Greetings All,

    With the winter mornings and evenings fast approching I want to try and sort out the 'lack of' my auto dimming rear view mirror. During daylight, if I put my finger on the sensor, (if you are sat in the seat put your finger on the forward face of the mirror, feel a small square hole and cover it up) absoloutely nothing happens. On my previous cars, and the wifes car, doing this simple test should see the mirror go dark, but nothing on the BM. There is no LCD spill, so I am going to assume that A) the mirror has given up the ghost or B) even when fully dipped its still crap!
    Any advice would be welcome.

    JD
    Last edited by jad70; 27-08-2012 at 22:01.
     
     

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    #2
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    Any ideas? If nothing else does anyone have the correct wiring colours for the mirror? First thing is to check that I am getting power. The website if found had the power coming from F24, on GN/WS coloured wire. I think these are german initials?
    Any help welcome.

    JD
     
     

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    jim 320D's Car Details
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    Well mine doesn't work :( although my rear window is so dark it makes no difference
    From what I've read you normally need a new one and wow there expensive if you do manage to fix it please post back how you did it


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    320d Tourer 11/2003
     
     

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    #4
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    755munich's Car Details
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    I think you will find there are 2 sensors built into the mirror. The one in the glass monitors light coming from behind & another on the back facing forward which reads the outside ambient light. The system needs to have 2 inputs so it can measure one against the other & accurately dim the mirror steplessly.

    An effective way to test function is to cover up the forward facing sensor (to simulate it being dark outside) then shine a torch into the glass sensor (simulating a following vehicle). If it's working ok then the mirror should dim-if not it's likely a new mirror is required.
     
     

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    jim 320D (24-08-2012)

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    #5
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    Nice one 755 just checked again and it works perfectly


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    #6
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    Thanks 755, just checked it out and all works ok. Looking at the wiring diagram it needs both the front facing and rear facing sensors to detect a drop in ambient, then a rise in rear light to operate. All my other cars dimmed when the ambient light dropped, making the rear light already dimmed when someone is behind you if you know what I mean.

    Anyway, problem sorted, cheers.

    JD
     
     

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    #7
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    Yes I know what you mean.

    The BMW system is a bit neater because it means you still get maximum ambient light in the mirror when nothing is following rather than permanent dimming just because it's dark! It's able to adapt to the surrounding light all the time.
     
     

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