im not sure what is required is in there as i took a look myself?
your situation sounds like mine. my car has bluetooth which i can connect my phone to to make calls from. it doesnt however have the media interface, which i believe is another module in order to control the music app on my phone. i have to use the aux input.
i believe you have to buy a module, a new bluetooth receiver, plug it all in and get it coded. but i havent looked into it properly yet!