Any guesses on why my LCD temperature display no longer dims after having a new head unit installed? I had it done "professionally" so I don't know what the guy did with the wiring. The head unit display does dim and I'm wondering if maybe he spliced into the wire leading to the LCD for "headlights on" information. I can't get it back to the shop until the 19th and it would be great if I could suggest what might be causing it. When I called the shop today the manager asked "Are you sure that panel dims?" I am sure, but how do I convince him?