One problem related to radio/tape cd player has been reported for the 2001 Mercedes Benz C320. The most recently reported issues are listed below.
Consumer went to start the vehicle and discovered that electrical components such as navigation, radio/cd, telephone, voice command, gas gauges, and power windows were not working. Since then the brake lights and turn signals were replaced twice, and will be replaced the third time in less than a year. Took vehicle to a dealer and contacted mercedes ,who said they could replace navigation and the radio/cd which s\were connected by same computer for $3,000. Dealer did not know why this happened, but there was an electrical short. Have not been replaced or repaired.