Hi, just fitted a sony after market unit to my A3. I've solved the problem of it not powering up due to the ignition not having an acc position but now I have no sound coming from my rear doors. The front door speakers are fine. I've tried fading the sound to the rear doors and turning the volume up, but there is noting there. A little info about the car and what I have done:

Audi A3 10 plate
It’s a non bose system as far as I know.
There are speakers on the front and rear doors, can’t see any others

Have removed the standard Audi concert double din head unit that looks like this:
http://www.audi-sport.net/vb/classif...df4d2f6cac.jpg
and it has the following pins in the back of it:
http://home.comcast.net/~kumind/A3-head2.jpg

Have been sold a ISO Audi active 2 channel quadlock like this:
Celsus ICE - car audio accessories

I’ve also fitted a fakra din like this:
http://images.esellerpro.com/2517/I/...n-ct27aa51.jpg

I’ve tried looking around in forums but there are that many combinations I’m now lost, and help please?