Need to disconnect XM Tuner

I have a 2007 Odyessey EX-L with Navigation. I've purchased the Directed Electronics HON-SC1 Siruis interface and the SiriusConnect Universal Tuner to convert the XM over to Sirius. I had them installed at Circuit City and the Sirius part of the radio is working properly. Unfortunately so is the XM. Both signals are still getting to the radio head unit and I can hear both XM and Sirus at the same time. Some people may dig this but it gives me a headache. The radio display also alternates between Sirius and XM information. The XM tuner obviously needs to be disabled or disconnected somewhere. The problem is we can't find it to disconnect it. Does anyone know where it is and how to disconnect? Neither I or the Circuit City dude can find it.

Thanks,

RQ