Day One:
Found the OnStar box under the rear seat on the passenger side. There are some plastic clips holding it in that will release it. There are two other cables that are attached that I am still trying to figure out. Maybe antenna? Took out the two J1 and J2 plugs and inserted them in the BlueStar II. seems to work except for some reason the microphone is not working very well at all. I can yell really loud and it barely picks up my voice to use voice control and someone on the other end of a call can barely hear me yelling....