If the feature exists in the vehicle then the auto-dimming for both rear-view & door mirrors is triggered by a photo-cell in the rear-view mirror.
 
I keep mine on high
Make the headlights dim and offset
But it doesn’t effect the side mirrors
On mine
 
Check that the liquid inside doesn't leak out, if it does it will permanently stain the dash top.
 
I've cleaned the sensor on the mirror, but I can't find the one on the back. The mirror has power but it doesn't work.
From Grrrrr's post I gather that a replacement is not cheap. Oh well.
 
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