I'm with you, I really don't want to cut any wires either. Mainly due to a dealer getting miffed about a cut wire if I have to take it in for warranty work or recall. I'll wait for the programmer to do it all. Outa sight Outa mind!
Like taking the regular juice off when going back to the dealer.
Now on the 06's If you have On Star they might know if it throws a code or has a change made. GM is offering a free service with your On Star system that e-mails you a complete diagnostic check and report every month on your vehicle. Kinda sounds like Big Brother. Just something to think about.