I tried to see if my Sirius Satellite Tuner worked. Turned the JVC to Satellite to access the serial no. and it came up with a message, "no antenna". I found a service bulletin which indicated the SR-JVC had a excessive current draw and the bulletin went through the steps to change the old S1R-JC1 to a new Two Module, JVC-SRA100 and Sirius SC-C1. The bulletin also listed the effected serial numbers, mine showed up, 673. Short of removing a lot of parts in the dash and driver side sill is there any way of knowing if your car had been changed?