your just finding what nonsense that is given in forums
the operation is simple the remote fob signals the the security ecu to send a 12v pulse to the master actuator, this in turn operates and open and closes the four slaves.
so start with does the fob operate in setting the alarm and remobilising the engine? indicating the ecu is functional, is there a 12 v supply at the master actuator?
Just to add there’s only one fuse fo the central locking, its 15amp positioned the the upper aux fuse strip above the main fuse board.
Also was replacement doors an exact match electrically with the main harness ?