Thanks. A quick clarification: You say you
Unplug[ged] the door big connector plug.
Sorry for being a twit but where is the "door big connector plug". Is it pry off the grommet and it's inside the bodywork pillar? Or is it inside the door itself, either by prying off the black knob-like thing and poking around, or by removing the door panel? Or is it the black knob-like thing itself where the cable goes into the door, and I just need to pull it off? My garage is full of other stuff so work has to be done on the drive in between the showers while getting frozen by the howling wind :-(
As an aside - when I was looking last night I discovered that the central locking works but the second press to deadlock doesn't. It's looking very similar!
if that blue wire is partially low to earth it will make the ecu think a door is open.
Absolutely. I have several times recently found myself checking to see if a door is open.