no central locking

hello, Got a 1995 3 door disco and I have not had central locking working since i got it but now its getting coklder it would be great if it worked save me keep walkin round locking the doors so any ideas why it could have died? I have checked the fuse and thats fine but nothing. cheers guys

First do you have a single button or a two button fob ? is the alarm/immobiliser working ?
A single button system the c/locking, alarm are in one module and with the two button there's one module for the c/locking and one for the alarm/immob.