Anybody have access to a wiring diagram for the factory B&O subwoofer wires?

[volcomic]

As the title states, I'm looking to determine which wires in the factory B&O wiring harness are positive and negative. The connector from the amp has a red/green, brown/purple, blue/green and brown/green wire matching up to a black, yellow, orange and green wire respectively on the sub. From what I've been able to find online, it appears the red/green > black is -, brown/purple > yellow is -, blue/green > orange is + and brown/green > green is + (edit: this is incorrect. see my post below). Just looking to confirm this before I install my aftermarket amp/subs. Thanks

[antsh]

Shoot me a PM with your email address.

[volcomic]

Thanks antsh! That diagram did the trick! The info I previously found on Audiworld included an incorrect diagram which doomed my install from the start. For anyone looking in the future red/green is -, purple/brown is +, blue/green is -, brown/green is +.

[maximedelo]

hi everyone, I need some help.
I have a base sound system in my a4 2018 and I am looking for the subwoofer wire colours. I have a grey/red and a grey/brown wire. Do you know which one is the + and which one is the -?

Thank you very much in advance!

[volcomic]

hi everyone, I need some help.
I have a base sound system in my a4 2018 and I am looking for the subwoofer wire colours. I have a grey/red and a grey/brown wire. Do you know which one is the + and which one is the -?

Thank you very much in advance!

The easiest way to be absolutely sure is to remove your stock sub. Attach a piece of speaker wire to each terminal on the sub. Take a new 9V battery and touch the + side to one of the wires an the - side to the other. If you have the + & - correct, the sub will move out (like it would to produce a bass hit). If you have the wires backwards it will move in. Once you know which side's which on the sub, it's easy to determine which wires on the factory harness was going to + and which to -. On the factory B&O sub with dual voice coils sub, both brown wires turned out to be the positive wires, which was a surprise because typically brown = ground (earth).

[JBAeroEngineer]

hi everyone, I need some help.
I have a base sound system in my a4 2018 and I am looking for the subwoofer wire colours. I have a grey/red and a grey/brown wire. Do you know which one is the + and which one is the -?

Thank you very much in advance!

shoot me a PM and I can help you out with the wiring diagrams.

[volcomic]

shoot me a PM and I can help you out with the wiring diagrams.

antsh hooked me up with the Audi factory wiring diagrams, but it didn't denote which wire(s) were positive and negative. What it did however tell me was that the wires are in different positions on the A4/S4 sedans than they are in the sportback versions of the A5/S5 (which I had already discovered upon taking apart my rear deck and seeing that the wires in my harness were in different positions than the pictures I'd found online of an install in a sportback S5). It also clarified was that the brown/green & brown/purple wires in the B&O system were interchangeable (as they are swapped in position between the two body variants of the car). That told me that they were either both negative, or both positive. I still ended up taking some spare speaker wire and a 9V battery to each voice coil on the factory sub to confirm.

[bruce_miranda]

I made a post about this because I don't think people understand that Black, Green, Orange and Yellow aren't the same on all B9 cars.

https://www.audiworld.com/forums/aud.../#post25474997

[DirtD1ver]

This might also help.

https://www.audizine.com/forum/showt...B-amp-O-system

[eightamrock]

I made a post about this because I don't think people understand that Black, Green, Orange and Yellow aren't the same on all B9 cars.

https://www.audiworld.com/forums/aud.../#post25474997

BTW Same issue here. I have a 2019 RS5 sportback, 9V battery test confirmed, Yellow+, Orange-, green+, black-