Tell me about it! Very deep technical information about the R is very hard to come by.
The numbers on the controller related to pins / termination points in the fuseboard and what not. I don't fully understand it all either but if you flick the ignition onto position 2, then off again, one of the wires in T14 will stay live for approx 5 mins. That's definitely your pump output. VW do normally use red for power, so I think it will be the red/black wire. There's lots of brown and green ones etc in the loom, but most of those are for the air con and temp sender inputs.
I believe the R's controller is the same as the 4 motion? I don't have etka to check for you I'm afraid! In fact, I think all MK4s with after run pumps had the same controller, so 4 Motion, 1.8T and R32. I doubt the diesels had it, but you never know!