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2008 Forester XT Sport 4EAT
1,663 Posts
There is a light sensor on the front and back. It dims if it receives more light on the rear sensor than the front.

Cover the front sensor with your finger, wait and watch to see if it dims. It's not super fast, could be 10 seconds or so.

If you have tinted windows you probably won't get much action out of the mirror as well, but it is needed less then anyways.

Oh, and when I say front and back I'm referring to front and back of the car, not front and back of the mirror.
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