Hi there welcome and thank you for the question hope i can be of some assistance to your problem
Is it only the central locking you are having problems with?
When the fault occurs and you unlock the drivers door does it unlock the rest of the doors or just the drivers door?
Does your vehicle have twin batteries?
Hi yes only the central locking, some time all the doors open but mainly only the drivers door.
No only one battery under drivers seat.
Hi I have checked the battery compartment and there is two batteries, I am guessing that the smaller battery operates the central locking????
Should I get this battery check out?
The battery at the front of the seat is the aux battery that runs the central locking etc just check the battery and see how many volts are in it.