Hi all, Just a bit of info that people may find useful (may also have been posted before too...) I have recently purchased a Vectra Estate 1.9 CDTI 120 Design 2005 (55) with the auto dimming rear view mirror. Whilst driving at night yesterday the mirror did not dim at all, even when blocking off the front sensor and shining light into the rear one. Today, to try and remedy the issue I removed the plastic 2-piece mirror surround and disconnected the ribbon cable from the mirror and reconnected it again. Hey presto this seems to have reset the mirror and it now works as prescribed.Hope this may be of use to all.Dave.