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just fixed central locking issues with my GUIV. Not sure is this helps but see how you go.
My remote fobs was using up batteries every 2 weeks then dieing. Now some patrols central locking has a switch and not an actuator in the drivers door and some do have an actuator. to test, place key in front passenger door lock and open. if it only unlocks that door you have a switch in the drivers door. if it opens all locks you have an actuator in the drivers door. mine has the switch.
I purchased a remote central locking kit from auto one for $59. Installed only one actuator in the drivers door and wired up the controller. Once installed, the aftermarket remote operates the drivers door actuator i installed which in turns operates the factory switch and central locking system. Bonus is that the aftermarket system operates from 30-40m away. Took me a couple of hours at the most.
Have also heard of guys experiencing unlock but no lock function adding new and improved earth straps