Intermittent car alarm. X Type 2004

My car alarm started going off for no apparent reason.  
After much investigation and browsing online, I was able to trace the problem to the passenger side read door when the fault went hard. The door closed micro switch not working giving a red light and details on the dash. 
Eventually I found information online that showed the connections to the generic control unit under drivers side dash.

The Green connector pin 15 is the signal wire from pax rear door. It was not going to earth when the door was closed. 
My solution (to avoid replacing the door locking assembly) was to solder a wire to the wire going to pin 15 and connect it to earth(negative).

Alarm is working normally and other 3 doors give open indications on dash. 
 

My information gives::

Green pin 18 going to drivers side rear door. RH Rear door switch  

Blue Pin  21 to bonnet sw  

White Pin 21 to  LH Front door switch.  

White Pin 22 to RH Front door switch.

I hope this info helps someone but cannot guarantee info 100%   However it has sorted my problem