Radio Static Noise When Volume @ 0
I have a new 2010 GT with the Shaker 500 radio. The other day I was sitting in the car with the radio on but the volume off. That's when I noticed a low static noise coming through the speakers. I tried to isolate the noise (front, back, left, right) and found that it was coming from all of the speakers. I turned the volume up to one bar and still could hear it. The noise is present with the car running and turned completely off. Any ideas as to the cause?