How is it not working?
Does it have remote central locking and is that not working off the fob?
Does it not work when you use the key in the lock, both locks or only one?
If it's the key not working, does the light come on, on the fob when you press the button, if not the battery in the key needs replacing.
If the CL doesn't work when you put the key in the lock it could be a fuse or a loose wire on the lock inside the door.
You have not said but I am assuming that no part of the CL system is working and all parts of the system are totally dead.
The rear of the passenger fusebox lists the fuses for each device. On my car the manual says CL is Fuse 38 and there is no relay.
CL is controlled via the body computer that is part of the passenger fusebox, if all parts of the system are dead and since left and right are identical if the fuse is good you are likely looking at a computer fault unless the car is very old and you have two wire breaks.