2003 Tahoe LT Radio Schematic

Good afternoon,

I am looking for the radio schematic for a 2003 Tahoe LT radio. Bose system, in-dash 6 disc changer, XM satellite radio

I need this info as I am looking to run a Y-connection off the existing satellite radio antenna to a male plug for a Sirius S50 antenna connection. The hardware (antenna) will work for BOTH XM and Sirius, I just need to add a male Sirius plug off the new extension from the stock satellite wire.

The local install people act as if I am from a different planet and insist on a wiring schematic of the existing stock radio.

Thanks for the help.

Happy Holidays.