Well, found it and KILLED it....DEAD!

@97 SL320 - you were spot on, I followed the thinner cable to a small box just in front of the rear window washer reservoir. There was a knurled thumb screw with a slot for a screw driver that held a much larger cable with a 'computer' style (like a printer port) connection. This ran up to the antenna but I removed it from the small black box. IDK, but I'm wondering if I might have been able to disconnect from the antenna side since the black box was a bit cramped in a much smaller place. Bottom line: it's silent. I'm happy

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Dale