In term of automotive industry, there are two main types of central locking systems, the manual central locking system and automatic central locking system. The 1992 Audi 80 central locking and alarm control unit consists of power windows control module, central locking system sensor, trunk lid alarm switch, hood alarm switch, seat belt warning control module, and alarm horn.
The following schematic illustrates the Audi 80 central locking and alarm control unit wiring diagram. The sensor will produces alarm when an invader approaches your car. The central locking unit allow the driver or front passenger to simultaneously lock or unlock all the doors by pressing the key switch.