Hi, I have just bought a TV Tuner (part# 4DO 919 146 C) to work alongside my RNS-E headunit, though when connected it simply doesn't seem to show up on my headuinit (as a source, etc). I've noticed the cable used to connect the two units has some spare wires which aren't connected anywhere at the headunit side. Was I ment to connect these anywhere? Of the main two unconnected spare wires, one is brown and one is red with a green stripe. Your help would be much appreciated.