Thank you for your responses. I did a search and found out the ulf module I have produced in 11 2003 has only bmw assist and no Bluetooth. My question is do I switch for a newer ulf module knowing I have to install a cradle button to pair. Or do I buy a tcu unit that pairs automatically. I only have one 52 pin black connection and the antenna connection to my module. It seems the tcu module has at least 3 wire connections so does that mean I can't use a tcu? I've read on forums that some fellow swapped out an older ulf for a newer tcu module with just plug and play, I'm just a little confused. In factI found on ebay a ulf unit and a tcu unit for sale together from a 2010 bmw. Now I'm really confused. Why both?