Sub With Aftermarket Headunit

[Eccentric_Badger]

Hi all, i'm new to the forum.

I have a headunit which i have successfully managed to get working dispite the lack of wiring looms and such, but the sub doesnt seem to work yet. Does anyone know what the connections are on the original wiring for the sub and what they should be connected to on a new head unit to get it working. On the old unit there is a vague diagram, listing some things such as remo, data, ena, com. and so on.

I have an A3 1.8T with the Concert tape deck unit, trying to replace it with a panasonic japanese import unit a friend gave me.

Also in getting the rear speakers to work there is now a constant hiss which i cant seem to elimenate.

Thanks in advance
EB