Ultimatly I intend on totally removing OnStar, but right now I'm just investigating my options. If its anything like the corvette VCIM/CIM you have to leave the GMLAN connector plugged in, but otherwise its dead in the water. Then I'll go find a non-OnStar rear view mirror and make a pass-thru for the GMLAN. I won't know until I see it.
Sucks I'll lose the integrated bluetooth functionality, but whatever... if I get bored I'll figure out how to integrate an aftermarket bluetooth handsfree into the old mic etc in my spare time.
Call me old fashioned, but the featureset of OnStar isn't anything I desire or need. I asked the dealer not to activate it, but he said he couldn't do that (which now appears to be a lie) AND OnStar refuses to terminate the service until the 1 year free is up. I could really deal without my car emailing me, tracking me and datalogging me
I know that GM/OnStar wouldn't bother with a gimp like me, but it still bothers me. If you read the fine print on OnStar (which you agree to by buying the car, doh) its not the nicest document in the world.
Now to find a how-to on removing the rear deck trim