Audi a3 8L concert radio replacement

[Isaac8L]

Hi,
I’ve just removed my factory concert radio from my pre facelift Audi a3 8L. I have a bose sub in the boot with 2 speakers. The stereo im installing is a JVC & has 2 sets of pre outs. I’m just after some info on what radio adapter loom I should get? And any info on wiring would be great please. I’ve read conflicting posts online.. Will post pics of my audi loom, has 3 different plugs but the red one only has one wire running to it. Thanks!

 

[OsterForever]

Since you have the BOSE system, you need an adapter for it. Look up "bose to ISO adapter" and you should find one. I can't give you an exact one, as I bought it here in Poland through a local seller, and it's just a generic chinese (working) crap without any branding or product number on it. They can also be a bit finicky, I think I went through 3 different ones before I found one that was working and wasn't causing any audio issues (hissing, crackling etc.)
Maybe someone else will be able to provide you with a link to a tested one.

Once you've got that, you just plug in the adapter into the wiring loom, then into the radio wiring, and you should be all set.

 

[Flooked]

Hi,
For your pre-facelift Audi A3 8L with the Bose system, you’ll need a Quadlock to ISO adapter with Bose support. Since your JVC stereo has pre-outs, look for a wiring harness adapter with RCA connectors for the rear amp (often labeled as “active system adapter” or “Bose adapter”). The red plug with a single wire is likely for the diagnostics/K-line, which isn’t needed for aftermarket head units and can be left disconnected. Make sure your adapter includes remote turn-on (AMP REM) to power the Bose amp — usually wired to the blue/white wire from the JVC. Post pics of the loom if you want help confirming the exact plugs.

 

[Flooked]

Hi,
For your pre-facelift Audi A3 8L with the Bose system, you’ll need a Quadlock to ISO adapter with Bose support. Since your JVC stereo has pre-outs, look for a wiring harness adapter with RCA connectors for the rear amp (often labeled as geometry dash “active system adapter” or “Bose adapter”). The red plug with a single wire is likely for the diagnostics/K-line, which isn’t needed for aftermarket head units and can be left disconnected. Make sure your adapter includes remote turn-on (AMP REM) to power the Bose amp — usually wired to the blue/white wire from the JVC. Post pics of the loom if you want help confirming the exact plugs.

what do you think ?