Antitheft system for a car stereo having a detachable grille

Details Antitheft system for a car stereo having a detachable grille Antitheft system for a car stereo having a detachable grille

1993-04-01

1994-06-21

Williams, Hezron E.

Communications: electrical

Land vehicle alarms or indicators

Of burglary or unauthorized use

B60R 2510

Patent

active

053231392

ABSTRACT:
An antitheft system, for car stereo having a detachable grille, has an identification resistor provided in the body of the car stereo, and a resistor provided in the grille. A circuit including the identification resistor and the resistor in the grille is formed when the grille is attached to the body of the car stereo. A voltage across the identification resistor is compared with a reference voltage for producing a coincident signal when the voltage is equal to the reference. In response to the coincident signal, the car stereo becomes operative.

REFERENCES:
patent: 4173750 (1979-11-01), Riba
patent: 4663611 (1987-05-01), Humphrey
patent: 4816909 (1989-03-01), Kimura
patent: 4866416 (1989-09-01), Holzhauer

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