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Can only access 1/2 the Control Modules

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Hello Can anyone suggest where to start looking for the following problem ? I am using a genuine fully licenced copy of VCDS 805.3 but can only access some modules.

The cable & software I am sure are fine as the modules are either accessed straight away or a great deal of trouble/don't work so I suspect there is a damaged wire somewhere - the car runs OK & nothing seems wrong. It is a Mk IV Golf R32 it used to have a double DIN Delta stereo in it which I replaced with an MFD Vagcom has worked fine for ages but went flakey a while back & now this which hopefully is easier to troubleshoot at least ! The K Line from the stereo is not connected hence the no comms errrors.

When I try to open all the common Modules this is the result -

Engine - VCDS goes in but no fault codes - too many comms errors to continue

Cent Elect - No Response From Controller (NRFC)

Aux Heat - NRFC

Cent Locks - NRFC

Xenon Range - NRFC

Auto - na

Air Bags - OK

CAN Gateway - 1 Fault Found: 01304 - Radio 49-00 - No Communications

Navi - NRFC

Radio - NRFC

ABS Barkes - in but no fault codes - too many comms errors to continue

S Wheel - NRFC

AWD - OK

Inter Monitor - NRFC

Auto-HVAC - OK

Instruments - 1 Fault Found: 01304 - Radio 49-00 - No Communications

Immo - go to 17 (Instruments) in German

C Conv - NRFC

I know some wouldn't work anyway but I got into the engine last week but now no joy so if anyone can suggest where to start looking it would be much appreciated

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