Sorry its been so long since I updated this thread but I've been away on holiday and frankly needed a break from Audi electrics!
When I got back I once again went through the wiring to check for errors but couldn't find anything wrong.
I decided it was time to admit defeat and take the car to an Audi retrofit expert and see if they could spot where i was going wrong.
Today I drove down to HazzyDayz near St Albans and sure enough they identified my error.
Its a little difficult to explain but here goes:
According to the
wiring diagram, there are both switched and permanent supplies to the modules. I took supply from two spare fuse positions in the dashboard fuse box, one switched and one permanent
I had always wondered why the modules needed both switched and permanent but assumed the
wiring diagram was correct.
In fact the "permanent" supply originates
from the modules and not as a separate supply from the fuse box. This wasn't how I interpreted the diagram as it refers to B310 as a "30" connection within the wiring harness which I thought was a permanent 12v and hence hooked it up to the fuse box. And because I connected the warning lights directly to a 12v source, the module generated the "short to positive" error.
Cutting the supply to the warning lights got everything working as it should with no error messages.
Tomorrow I'll go out for a drive and see if I'm going to need re-calibration of the radar modules but since they came off a 2015 SQ5 like mine I'm hoping they'll work straight out of the box.
Thanks everyone for sticking with me on this long saga and for your help and interest, it was much appreciated.
Russ