My 2000 s80 turbo rear view mirror went bad. It shut down my interior dome lights as well as my sun roof, and I think my remote keyless entry. I replaced it with one from the junk yard that was in real good shape but it work for a while then none of the above worked. I was told that they have to be programmed by the dealer, but the dealer said it has to be new. Is this true and if so where can you get a good deal on one that works.