I have a 2009 G8 GT that came with on star. It appears that everything in the cellular communication system on the vehicle is the same for bluetooth, except for the module and antenna that goes on the module. I got both these parts from the dealer where it work and installed them. I now can get the module to pair with my phone for bluetooth connectivity. The problem that I have is that as soon as the radio shows that it is "voice" mode, it can not be taken out of voice mode short of disconnecting the module. I do have access to GM programming and any suggestions would be greatly appreciated.