Trying to fit a new head unit to mate's Audi A4 (P reg, 96) - took out 
original Blaupunkt factory-fitted unit and fitted JVC one (not sure of 
exact model numbers, can post later if needed).

The Audi has ISO connectors for power and the front speakers (only 
central 4 connectors wird up in brown socket), so can get the unit up and 
running, but only through the front speakers. The wiring loom has three 
coloured connectors, blue, green and yellow, looking at the diagram on 
the original head unit, found that the yellow connector had wires for 
"Right rear", "Left Rear", two COM wires and another wire with a switch 
symbol.

Tried to be clever and cut the wires out of this connector and wired the 
RR,LR, and the COM wires to the brown ISO, but it didn't work - now I 
have a mangled wiring loom and still no rear sound!

There are a load of wires on the blue connector, but I have no idea what 
they do!

Can anyone help, or let me know where to look for info?

TIA

-- 
Shabs.