[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.

In my case my left arm is still working so I can flip the tab if it is too bad, but I'm betting there is no tab on the auto-dimming version?

Cheers