If you can hear any preview xm channel i believe channel 247 or 0 you can stop the audio from the satellite tuner using an A and B
interior switches idea, this interface works with audio sensing so there is no manual buttons to use, you have to find the audio wires in the satellite plug this is the cables that send the musicc from the xm to the infinity radioo, this cables are double shield and you have to cut them white and red or back and red in some vehicles, this is the device we use
http://www.oemautosound.com/pc-386-9...interface.aspx
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