Hi, i have a 2004 A160 Piccadilly and recently, i noticed that as i am driving, the instrument cluster lights flicker and sometimes stay on, even though the driving lights are switched off. The cluster also lights up when i switch the rear heated screen on, and also the rear wiper( which now rarely works) Could the rear wiper be causing some kind of short? The instrument cluster also illuminates when i press the brake pedal, but not always. It seems to happen whenever you use something conected to the tailgate(brakelight, rear wiper, heated rear screen). Any ideas?