Hi folks. After stripping almost the whole interior just to find out why I was not able to unlock the vehicle through the hatchback door, came to find out hiden in a neatly rapped bunch of wires a tiny corrosion on one of them just enough to cause all this havoc. Got it cut, soldered and isolated and all central locking is working nice. Attached is a photo of the wire by the rear right door.

Well spotted!!

Eagle eyes in action. Good find.