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Originally Posted by AlanD
I'd expect that the circuitry controlling the auto headlights also controls the mirror (or is there a sensor pointing rearwards in the mirror frame?), and since that sensor is behind the the mirror and points at the sky I wouldn't expect following headlights to have much effect.
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I'm pretty sure there's a sensor in the mirror surround - as it only darkens when there are headlights behind you, that's the whole idea
