I have a 99 Grand Prix. Bought the car a few weeks back. Fixing all kinds of stuff. One thing I noticed it the rear view mirror has a cable running into the headliner. The mirror itself has a slightly different plane of view right in the middle that is oval shaped. THere is a button on there labeled 'auto' When I press it a green LED comes on in the mirror plastic frame.
It here supposed to be a digital indicator there or something? I have seen posts about auto dimming but not sure how that works.
Any and all suggestions or help is appreciated.
Thanks!