Patent ID: 7391130

Claim:
A device to vary a grounding configuration of a vehicle audio and video (A/V) system, comprising: a vehicle body ground; an A/V system chassis ground configured to be connected to the vehicle body ground when the vehicle A/V system is in one of amplitude modulation mode and frequency modulation mode, the A/V system chassis ground configured to be disconnected to the vehicle body ground when the vehicle A/V system is in one of Digital Versatile Disk mode and tape mode; a controller that outputs a control signal to connect the A/V system chassis ground to the vehicle body ground or to open said A/V system chassis ground and said vehicle body ground according to the modes of the vehicle A/V system; and a relay that connects said A/V system chassis ground to said vehicle body ground or opens said A/V system chassis ground and said vehicle body ground in response to the control signal output from said controller.