remote central locking

[skid]

Can some one tell me where to find the module that I can tap into to install an after market alarm with remote central locking in a 2000 GU, as the "fobs" that came with the car ceased to work properly the other day, some times they will lock but not lock, other times wont unlock but will lock. I know the batteries are probably just going flat but was intending on putting in this DEI alarm system in anyway, can see the wiring diagrams in the manual but can find any reference to the module or where it is located

Any help appreicated