I'm not sure about the OP's Griffin product, but i was using a BT gateway to A2DP and i had to manually connect to it all the time.
This product is the only one that i know that will allow your phone to connect to the BMW BT phone kit and this device automatically:
http://www.newpotatotech.com/TUNELIN...link_auto.html
They have an app for iphone and android to download to modify your settings and play your music through.. pretty neat!