How Does a Car Central Locking System Work?
2 Answers
The working principle of a car central locking system is: the locking and unlocking process is completed by reversing the positive and negative power supply of the motor. The central lock consists of two double-contact relays and a control circuit. When an unlock signal is received, the unlock relay engages, allowing current to pass through the motor to form a circuit. The purpose of installing an anti-theft central lock is to control the vehicle's original central locking system, achieving the goal of remote locking and unlocking. The installation can be connected according to different vehicle control methods. Generally, an anti-theft control unit will have six central lock wires, and the installation of all central locks is completed by the wiring combination of these six wires. Some vehicles do not come with a central locking system when leaving the factory, in which case it needs to be retrofitted.
The working principle of a car's central locking system is actually quite simple - it's an electric system that controls the opening and closing of all doors. When you press the button on the remote, it sends a radio signal to the control module in the car. This module acts like a brain to process the signal and then sends commands to each door's lock motor. The motor pulls the lock rod to either lock or unlock the door. The whole process happens quickly, completed within a second. Most vehicles also have a backup method designed: using the key to open the driver's door will simultaneously unlock all other doors, preventing inconvenience when the remote battery dies. This system runs on the car battery and has fuse protection in the circuit - if a short circuit occurs, it will cut off to prevent damage. I've experienced signal weakness in cold weather when the remote range decreases, so I recommend regular battery replacement to avoid this situation. Newer models have added anti-theft features where signals are encrypted before unlocking, significantly reducing theft risks.
