i got a question is the 15 pin trailer towing module already installed in my truck? i have a 2006 X5 3.0i. or do i have to buy that peice and install it. if i have to install it where does it go? i was just wondering because i have a fuse in the fuse box and it says trailer something im sorry i cant remember. if i do have it all i would need is the 12 pin plug that is pre-ran in my cargo area that the trailer light plugs into.