Vehicle anti-theft system

Details Vehicle anti-theft system Vehicle anti-theft system

1995-06-05

1997-11-11

Hofsass, Jeffery

Communications: electrical

Land vehicle alarms or indicators

Of burglary or unauthorized use

307 102, 307 106, 180287, B60R 2510

Patent

active

056868839

ABSTRACT:
A vehicle anti-theft system in which, only when the ID signal is obtained from a right ignition key and when the vehicle anti-theft function is halted by the failure of an anti-theft circuit or theft detection unit itself, the start-up of the engine is permitted. The system comprises a unit for generating a start-up enable signal in response to a verification signal representing a right ID signal, and an engine control unit for performing the start-up control of the engine in response to the start-up enable signal and disabling the engine in response to a theft signal. The start-up enable signal generating unit generates a start-up enable signal in response to the fault signal. A dummy line for detecting a breakage is wired along various signal lines wired on the substrate of an immobilizer, which, if intentionally broken by an ill-intentioned third party, could cause a fault signal similar to that for the failure of the immobilizer to be outputted from a determination signal output terminal. If a break in the dummy line is detected, the engine control is inhibited even if the fault signal is detected.

REFERENCES:
patent: 4291237 (1981-09-01), Kitano
patent: 4366466 (1982-12-01), Lutz
patent: 4736113 (1988-04-01), Leu
patent: 4749873 (1988-06-01), Mutoh et al.
patent: 4965460 (1990-10-01), Tanaka et al.
patent: 5254842 (1993-10-01), Posner et al.
patent: 5519376 (1996-05-01), Iijima

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