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In a FIAT 500, the central locking system can face three common problems. Essentially, when you use your key FOB, it sends a signal to activate the door lock actuator, which physically unlocks the door. The first issue that can arise is a blown fuse, a simple and inexpensive fix. If the relay fails, no signal will reach the actuator. Another potential problem is with the power door lock switches - if they fail, pressing the button won't work, and these switches can wear out over time. Finally, the lock actuator itself may malfunction, with gears wearing down from use, requiring manual door unlocking until it is repaired.
After my car battery died, my central locking system stopped functioning. I tried to find a solution online, but all I came across were articles about replacing blown fuses and door actuators. Even though I could hear the central locking trying to engage, it wouldn't stay locked. To fix the problem, I put the key fob in the driver's lock and turned it to the right while pressing the close button on the fob - and that did the trick to get the central locking working again.
Certain issues with the central locking system in a 2016 Fiat 500 may arise from a door latch that is out of alignment, a blown fuse, or a defective door lock actuator.