North East Forum Moderator
Was a while ago now but from memory...
The PCM unit had a wire to feed in the 12v which started the camera, I connected this into the Reverse Switch in the Central Electrics Board. Can't remember what pin, but could find out on ElsaWin if needs be (Im on a different computer so can't look now). You could always connect the 12v+ wire from the reverse light which is easier to find, but means running a wire down the side of the car.
I then connected a wire to C2 of the RNS-E (which you say isn't listed as RFSL -- it still works) and connected this to the two wires. The 12v+ connection to this switches the RNS-E.
Take a look through some of my previous posts/threads, think I may have a more thorough description, I can't really remember it was a while ago.