im getting ready to start playing with the stereo, and controls as well....no one knows much about these, as its not like a SCC with honda, mazda, nissan wirtten on it, where theres lots of people upgrading and customizing.....
chevys a PITA since most of the theft deterrent system is inside the stereo....your nox may fire up after the switch, it may not, and need to be reprogrammed by the dealer....but it will fit....
also the XM tuner is separate from the headunit....at least on early models it is...
as far as the pioneer setup goes, i cant find any info on the difference in headunits....i know theres the rear sub with an amplifier, but that will be tied in elsewhere, as the harness for it, is only 6 inches long or so.....
TSB #08-08-57-001B is a general water leak bulletin its about lack of body filler, youd need to check under the rear bumper for proper welds, and not holes in the body......i assume you got some water in there?