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Diy installing android navigation head unit for Audi A3 8P. Same steps for A4 B7. For more details read here:
www.audi.homeradiatorsreview.com
ERROR FOUND!!! Go to minute 1:39. Small green plug has 3 wires for rear speakers and subwoofer (read the big label on the original head unit). Now, go to 3:20, and see 2 x audio plugs labeled AUX FR IN and AUX FL IN. They are WRONG LABELED! They should be labeled as AUX RR IN and AUX RL IN and they are connected to those 3 wires in minute 1:39. So, if you want subwoofer and rear speakers to work, connect this 2 plugs labeled as AUX FR IN and AUX FL IN, to those 2 plugs coming from android head unit labeled as RCA RR and RCA RL, in minute 3:48. Rear speakers and subwoofer will work but lower than front speakers, that is why you need to balance and fader the sound. My android navigation has a good sound, same like old Audi Concert, all speakers and subwoofer are working.