Ok, the master actuator will have a pink and an orange wire feed the slaves in parallel, also a brown/pink wire which is the permanent 12v supply and finally the black wire connect to earth.
If the connections are complete, then turning the key in the drivers door lock the actuator will switch 12volts the slaves… depending on which was the key is turned, so all very simple.
If this doesn’t happen then test for the voltage into the actuator and then out on either the pink or orange when the key is turned, so if there’s voltage into but not out of the actuator then the actuator is iffy as it isn't switching, and if so simply replace the actuator.