I have taken the brave steps and installed an RNS-E unit into my MY2010 A3. I bought the unit and relevant wiring from ebay. On excertion of the previous unit I was kind of confused by the wiring. I had also bought the Connection boxes and ariel connector as advised, however after looking at the existing loom it looked to me like a straight fit and sure enough all slipped in perfect and all works perfect. Although the one thing I can't seem to get working is the AUX input. The unit states that the AUX is activated although no sound comes through the system. Do i need to do a VAG-Com on this ? everything else has worked without coding. Anyone got any suggestions?