Remote control pass-key module for anti-theft system equipped vehicles and installation method

A method for enabling remote control of a function in a motor vehicle equipped with a key identity code verifying anti-theft system under control of a vehicle control unit connected to a key identity code receiving sensor through a data communication link and an enable line, said method comprising the steps of:

• (a) providing a pass-key electronic module with communication and switching capability, in which an identity code is memorized;
• (b) connecting said pass-key module for communication with the vehicle control unit through said communication data link;
• (c) connecting said pass-key module in series with said sensor enable line for controlled switching of said line;
• (d) communicating the identity code to the vehicle control unit for validation of said identity code;
• and
• (e) connecting said module to a remote control system controler output so that when a command signal is generated by said controller, the module switches the key identity code sensor enable line open, thus disabling the sensor, and communicates the validated identity code to the vehicle control unit which then enables a function in the vehicle.