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Anti-theft system for automotive electronic accessory with coded interlock

  • US 6,104,309 A
  • Filed: 02/18/1994
  • Issued: 08/15/2000
  • Est. Priority Date: 12/15/1989
  • Status: Expired due to Term
First Claim
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1. An anti-theft system for a vehicle comprising:

  • a portable remote control unit responsive to actuation of buttons thereon for transmitting a radio frequency signal including a first identification code;

    a security unit fixedly mounted on the vehicle, the security unit including a receiver for receiving the radio frequency signal, a first memory for storing a second identification code, and a first processor for comparing the received first identification code with the second identification code and for generating a third identification code when the first identification code coincides with the second identification code; and

    an electronic audio device removably mounted on the vehicle and connectable to the security unit, the electronic audio device including a second memory for storing a fourth identification code and an audio signal generator for transmitting audio signals to an output device, the electronic audio device including a second processor for comparing the third identification code with a fourth identification code and enabling the audio signal generator only when the third identification code coincides with the fourth identification code.

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