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Has anyone else noticed a buzzing sound through the stereo when the headlights are on? It is only noticeable when the volume is fairly low (1 or 2), but it is very distinct. The buzzing clearly switches on an off with the headlights. DRL and fog lamps do not cause the same problem. I am wondering whether this is an "undocumented feature" common to all cars or a problem specific to my vehicle.