There are many brands that offer central locking systems out of which the most popular and best ones are Nippon, Autocop, and blackcat. Some of the most common reasons why a central car locking system isn’t working, can be - a blown fuse or internal wiring issues, a faulty actuator, a dead or faulty key fob, or a dead car battery. In any of the cases, it is advisable to take your car to the nearest mechanic for a repair.