Ok, central locking 101.
Step 1, unplug the pump for a few minites, this will reset it.
Step 2, check all external locks with the blade key, see what works and what doesnt. All funtions including valet for the trunk.
Step 3, summer opening (if equipped) do any of the functions work?
Step 4, go back to step one and see what dosen't work, start there. The remote is sort of a add on in those years and may or may not indicate a lock problem but a ata problem instead. One quick test for the c/l pump is being very quiet and activate the lock switch, listen for the pump, even if the locks dont move. If you dont get a pump, manually lock it and switch inputs and listen. Keep in mind the central locking and ata and convience features are all individual systems linked together and work more or less independently of each other. I've replace a few central locking switches here and there and a few pumps as well but the key to these systems is being very through on the function tests of all related systems.
Joe