A central locking system has nowadays almost any vehicle. It can be installed easily into existing vehicle, if there is some experience in dealing with the on-board electronics.
When installing existing regulations must be followed in order not to endanger insurance and registration / Tuev.
An immobilizer is usually supplied as a kit with the circuit diagram and connection diagram.
Some models can also be operated by radio
Here links to Central Cars

Here you will find Schematic Circuit Diagram for DIY and further information on Central Car
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Radio Central

www.z-tronic.de/security/funkfernbedienung.asp