Nissan micra 2001 remote central locking issues

Hi, i'm new to the site so hope i've posted this in the right place.

I'm currently fixing up my girlfriends micro and my last job is to sort out the remote central locking. Basically every time you press the fob to lock or unlock it will automatically lock within a second or so. I have had the door cards off and disconnected the front actuators and still the same happens through the rear doors. Very spooky. If anyone can part their wisdom on this subject then i will be very grateful. thanks

what about when you use the key manually in the door?

Yes it's the same. I thought it would something to do with the central lock control box but i'm no auto electrician.