2008 lancer door locks
 

Hey guys,
So I recently bought a 2008 lancer and I've noticed that the power locks are not working. The passenger rear door works correctly but none of the other doors lock or unlock with the central locking - either using the key or fob. I've checked the 'powerlocks' fuse and I have checked the IOD fuse and they are good. I've also tried disconnecting the battery (2 hrs positive terminal) to reset the CPU but no joy. Does anyone have any ideas?
Thanks