2004 E53 4.4, build date 4/2004. Steering wheel has phone controls, as does the radio/CD player. No nav. When I opened the left rear compartment where the nav DVD player and the CD changer would be (if I had them), I found what I believe is the Bluetooth adapter (pictured below). I cannot get either of my phones to find a BT adapter when I try the BT pairing procedure given in other threads. Is this, in fact, a BT module, and am I doing something wrong trying to get it paired? Is the build date on the module 12/2004, and if so, could this be a retrofit? My understanding is that X5's built before late 2004 did NOT have BT compatibility, but if that's the case, what's the module shown below? (sorry about the picture size!)