2010 L322 SC V8
Soo, I was at the car wash and noticed the door harness to body plug was loose, so plugged it back in, after that there was no response from the fob at all. Brand new batteries in the fob, brand new car battery too. Got it started by holding the fob below the light near my knee, however this wouldn;t light up the dash or allow anything apart from it to be driven.

Got home, pulled the plug back out and all worked well again. I left it like this all week, pulled the kick panel off today to fiddle with it, can't notice any loose wires or anything, I've also poured over the wiring diagrams and there's nothing to do with the central locking fob in that harness.

Any ideas team?