Hi all I've just got myself a 2006 3 series M sport convertible, I love it. I'm trying to install my sony Bluetooth sound system... I've managed to get the standard radio out and have connected the sony up. No audio plays through the speakers. Rather than mess about with cutting wires I bought a connector from halfords, that all fits together nicely and the stereo turns on but the audio won't play through the speakers. It has the Harmon Kardon upgrade installed - would this be something to do with the lack of audio? Any help would be greatly appreciated! Thanks jack.