Try running power to the actuators and see if you get some noise.
If you get no movement or no noise it might be stuffed.
You can buy actuators cheap any ways.
Just make sure the ones you buy have the same amount of wires.
bummp, got issue with my aftermarket central locking as well,
both door locks fine manually with key, and it still alarms the car, e.g when press lock, it will beep to immobilize but will not lock, and when i open one of the doors alarm will go off
just wondering if anyone had similar issue? is it just the actuators needs replacing? or fuse
Had this issue (very similar) with my Honda system. Honda quoted me $880 for door actuators but they werent 100% sure. basically what was happening was that the signal wasnt reaching from the remote to the sensor in the car. If I wanted to lock my car with the remote I had to be in the passanger seat and point the remote directly at the sensor (which was pretty useless). I opted to replace the system with a aftermarket system although an auto electrician may be able to help you out.
1. If you door doesn't unlock/lock (but still arms) when your remote is pressed - most likely your master/actuator is stuffed and needs replacement. As someone else said - they're really cheap to buy. They're 99% all the same out there, a blue and green wire - buy a new one and swap it out to match it up to your existing and it will work.
2. If only your drivers' side locks when it is armed/triggered, it means that the door trigger switch for the central locking system is worn - it only triggers sometimes, hence only locks the passenger when it does short the signal. Try spraying WD40/electric contact cleaner into the door latch section from INSIDE the door (remove the door trim) and try sliding the rail with your hands a few times to lubricate it. If this doesn't work - then replace the switch (a PITA to remove and swap out, probably easier by changing the whole door tbh lol). Otherwise, be smart and rewire the factory module to be triggered by your existing actuator. This will work, but it will create a delayed trigger for the passenger side to lock - maybe 1second delay opposed to simultaneously.