I have a 2003 Envoy XL SLT with the non-Bose 6 disk in dash radio. I just bought the isimple interface for my IPOD but it apparently needs a satellite radio port. The installation instructions say that the radio may have an inactive satellite radio port and to contact my dealer for activation. My local dealer had no idea what I was talking about. Anyone know if this port is on my radio and if so, how do I activate it?