aftermarket headunit woes

[golf301]

Hi all
I am trying to replace the standard head unit in my b6 avant but I am struggling to get any sound out of the rear speakers or the factory sub.
Does anyone have any ideas what colour wires do what please?
Cheers

 

[AndyMac]

What adapter are you using?
The front speakers run directly off the HU, but the rears and sub are separately amped, so you need an adapter to connect the non standard mini ISO loom to the RCA's on the HU
You need the PC9-404 to feed the rear RCA's from the new HU to the feed for the rear/sub amp. You then need to connect the blue flying lead on this adapter to either the remote on or power antenna feed from the new HU.
You will also need to fade to rear quite a bit to balance the sound as you now have twice the power going to the fronts from the new HU.