hi guys, i've tried several times to connect my multimedia headunit but i can't get any sound to come thru the speakers. i've connected the harness as descibe in some of the threads, orange wire to bose connection and all speaker connections look ok. blue flying wire grounded. still nothing. can bus is in place on the harness. have noticed next to the speaker conns to the audi conns a white con going to nothing on the aftermarket harness...looking on the diagram of the audi unit it as a symbol which looks like a bridge thats open. apart from trying to fit this unit myself, lol, what am i doing wrong? the car is a full bose system my mrs is sharpening the kitchen knife, think shes had enough of me.....help.