help for new guy with a connection problem.

[GTI EDITION (aka LTD)]

I've just checked the wiring diagram . The wiring for the diagnostics plug have a connection on an ' adapter plate ' which is located on a bracket above the relay plate/fuse box .
This is where you should find the two wires that go to the ECU , one is Yellow ( 0.5 wire size )  the other is Grey with a white tracer ( also 0.5 wire size ) .
The positive feed comes from fuse 21 ( 15 Amp ) then the Q/5 connection on the back of the relay plate via ( dash panel wiring loom)  Red with a white tracer ( 1.5 wire size )
The earth  wire is Brown ( 0.5 wire size ) and is connected into the wiring loom for the instruments .

         
Hope this helps, 
                      Oli   :smiley: