[polarzak]

I thought I had every problem conceivable with my Lucerne, but never this one. Just a long shot here, but without hearing it, it would sound to me like a relay hum, possibly for the signals (since it had an effect on it) or key in ignition minder or radio ( since opening the door stopped it) It is a guess, but we have to start somewhere. Glad you are happy with your Lucerne.