Electrics: Rear view Mirror Auto Dim not working

[kylespk]

O k I have had a look at the forum and I am aware of the few posts dealing with this issue

My understanding from them is that one can replace the glass by glazing on top of existing glass or by dismantling the mirror assembly. These options are fine and I believe that they are for seriously damaged liquid. I have included photos of my mirror and I don't believe that the liquid in my mirror is gone.

When taking the photos I have found a wire with a little black box (as seen in the photos with my mirror) and my mirror does not have a back cover so my question is:

What is the black wire and what is it do and where does it go?

Why is my mirror always on auto-dim?

Is there anything I can do without a full replacement (I went to a Volvo dealer and they said it will be in excess of £500, and the only recommend a full replacement. They did this without even looking at the car!) ?