i was about to post this info here because i couldnt find it listed uner the terms i searched for. but i found it and did not know that the site i got it from (hackaday) has the same thing with a like to the same site that was posted. that site is
http://members.cox.net/onstar/ i cant view this site on gov't computers. so i am just going to post it and check it out when i get home. but if i remember correctly, u can use any gm onstar set to do this.....