Hello all I am new to the forum but belong to several others with my other cars and always get great advise so I would imagine I would find the same helpful knowledge here. I have an 07 A4 with Symphony sound. I am trying to install a Pioneer AVH-P2300 head unit. I purchased the wire harness kit and wired everything as per the instructions but when I install the unit I have no rear speakers. I figured out the rear speakers are powered by a seperate amp and wired into the OE unit through the green plug but on the new harness there is no connection for that plug. Can anyone tell me how I should attach the wires from that plug to the new head unit. I am guessing I need to cut and splice the wires but does anyone know what wire goes where.
Thanks
Mike

 

I'm not sure, but on my Concert HU there is a photo on the top that shows what wires go to what locations on the harnesses. You should check your symphony

 

I know what to do here. In fact, I made a youtube video about it.

‪Finished Head Unit Install on 2007 Audi A4 that has Symphony 2 Sound System.‬‏ - YouTube

Enjoy.