i have a 2000 a4 1.8t avant, 5 speed. ok, the auto dimming mirrors. i've noticed that the interior rear view doesn't dim at all now. it used to. obviously at night when everyone's using their headlights. the left and right exterior side mirrors still dim. but not the interior. i'm not so keen on auto electronics. does anyone have a clue where a good place to start to try to fix this issue would be? thanks

 

I am not looking at my car right now but isn't there a button to turn it off and on, on the mirror?

 

i dunno. haven't looked for a switch. there seems to be a light sensor or something on the bottom of the mirror frame that faces the rear. if there is a switch, sure as caca didn't flip it. hmmm, i'll go out and see if there is indeed a switch, but off the top of my head, i don't think i've ever seen one. do these mirror's dimming effect burn out like light bulbs or something? could be a loose connection. but where to start? fuses must be fine if the sides are still dimming.

 

mine doesn't have the button. you'll probably need a new rearview mirror

 

Failing a button on the mirror, I would start by checking the fuses anyway.