yeah you need some sort of control box to control them. It's pretty much just a few relays. One will act as the master (drivers door, sometimes front passenger as well), and then all the rest are slaves. Master actuators have a motor (two wires), along with a two way switch to determine the position of the actuator (three wires, one being common). Most of them work by negative switching, so when you unlock the master door it grounds the common wire and the unlock wire and that will trigger the relay in the control box to unlock the slave actuators.
You can buy a central locking kit from supercheap, jaycar etc for around $40 - I installed one in my Eterna and it was pretty easy to install. I don't know if anywhere has just the relay box seperately. Even if you buy the whole kit you'll have some spare for like boot locks, fuel catch lock if you wanna be flash haha.