ok, no one had any info on upgrading the stereo, so i changed this post. i think i will just get a professional clean install of sirius radio. which receiver unit are you guys using, and where do you have them mounted? also, where do you mount the antenna? pics are welcome. thanks for all your help guys.

 

I purchased a new aftermarket XM for my 03 Cadillac Escalade. It plugged into the vehicle wiring harness and the receiver & antenna receivers boxes are out of sight behind the dash. The original radio controls including the ones on the steering wheel work.

I would suggest contacting local eletronic stores to find out if one is available.