Having problems with your 2002 BMW M3 ?
BMW M3 E46 Stereo whine
\015 When the stereo is on, on all inputs (radio/CD) there is a loud whine. Coming from unit so leads to me thing there is a short or something? It increases as the volume is increased.\015
What you are hearing is ground loop interference. If you have an aftermarket headunit/amplifier this is a common occurrence. A ground loop isolator in line with the low level amplifier inputs should solve the problem. Otherwise, it may be a malfunction of the stock cd unit or amplifier. BMW used a balanced input on some of the stock amplifiers, which would make ground loop interference all but impossible.
Repair Help & Product Troubleshooting for 2002 BMW M3
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