would you happened to have the part number off that unit? there were a gazillion of the BT modules made, but we can try to figure what the item is, and if it is a BT module, what generation it is... I am using a 12th generation BT module, with the VR that also controls the Nav... Some of the BT units required a separate VR module, but then some had it built-in...
there were some issues from the factory on the 2004 BT units that claimed to have the BT but in reality they were only Telematics or ASSIST... you can dig around the forum for more detailed info...