Here is the stereo radio wiring information for your 2002 Audi B6 A4 with the standard, symphony, or Bose systems. It will be useful when installing an aftermarket radio, sound stereo system, or other automotive accessories. Everything Audi. News, questions, and reader rides. It's all welcome as long as it's Audi. Have any of you done any audio upgrades to a b7 a4? Submitted 3 years ago by ImDubbinIt. Go have a search on eBay for 'a4 b7 satnav' or similar for the Chinese knockoffs and some refurb OEM stuff. That'll give you an idea of what's available. B7 Forum 2005.5+ Audi A4, Audi RS4 & Audi S4. (Audi A4 Forum, Audi RS4 Forum, Audi S4 Forum). Aftermarket stereo / speaker info.? Just bought a 2007 A4 quattro. Love it but do not love the stock sound system (stock system, no Bose or navi). A few questions for you all--any feedback appreciated. Installing aftermarket stereo in my A4 –, 04:18 PM Hi all, Having read tonnes of threads, I'm not quite getting the full picture, so I need to ask what may be an obvious quesiton to a lot of you!

Ok I have an '04 A4 with Symphony Sound and 6 disk in dash player. I just bought a new aftermarket headunit and wiring harness all that. Well just spliced the wiring harness to the aftermarket headunit harness and pulled the OEM head out.

There's 3 clips that come out of the back of the OEM head, a black a brown and another black. On the wiring harness that came for my model car only one of the black clips and the brown clip plug into this harness leaving one of the black ones just dangling. From what I'm understanding is this extra black clip is for all the rear speakers so I'm only getting sound to the front speakers. Do I have a wrong wirining harness? I ordered it from Crutchfield and told them all the details of my car and they said that's all I need, I'm just very frustrated right now. Free house plan dwg. The bottom plug in the diagram on the radio shows you what you need to do. The block to the right is where the wires are for the rear speakers.

Take the amp turn on from the aftermarket radio and tap it into to the wire with the symbol right next to the wire that says 'com.' Take the the positive leads from the rear speakers on the aftermarket radio (should be green for the left and purplie for the right) and tap them into the 'rr' for right rear and 'lr' for the left rear. Now take one of the negative leads from the rear speakers on the aftermakket radio (it does not matter which one) and tap it into the 'com' this will give the amp a signal to replay music, however, the rears will play a little louder.