bigbadcurt

Can anyone tell me why my central locking is not working ? car is 1.8i zx 1997 model 3 door , my battery was disconnected for over a week and when reconnected nothing , put new batteries in fob and no change ! if i put key in driver's door it will only operate that door ,no noise from central locking , tried a couple of local garage's and one guy told me that it has to be taken to citreon dealer to reset memory because battery had been out for so long ! can anyone tell me if this is so ? if not has anyone any idea's ? many thank's.