My 1995 525iA radio produces noise when the rear window defogger is on. When I press the button to turn on the rear window defogger the stero indicator on the radio goes away and it produces a lot of what i consider white noise. This problem only occurs with the radio and not with the CD or tape. This does not happen when I turn on the AC. The car has the stock Pioneer radio. Any ideas what the problem might be?
John W. List