FiXED - Here was my solution.

I had already drained the AC and fitted a replacement pressure sensor (UV light showed die in top of electrical conector) and then refilled AC.

After lots of head scratching the solution was blown Fuse 2 row C. It appears my earlier visual check either missed it or it blew at some stage of testing.

I found it after reviewing the wiring diagrams. There ate some good ones for Cayman on Planet 9.

https://www.planet-9.com/d2/legacy/d...20DIAGRAMS.pdf