AFN non start

Hello folks, I hope you're all ok during these crazy times.

I have a VW T3 with a 1.9tdi (AFN) conversion which I drove to a storage unit a few months ago and now will not start. For some reason I have no power to the 219 relay and can't find a wiring diagram to trace what comes from where. Would anyone be able to shed any light on what the power/ earth route is please?

Thanks in advance.

Just to update, I have found water damage to the ecu which has corroded pin 33. I think this is the problem but I will post when I source a replacement ecu.