Failsafe disable in a vehicle security system
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United States of America Patent
Stats
-
Feb 5, 2008
Grant Date -
Jun 29, 2006
app pub date -
Dec 23, 2004
filing date -
Dec 23, 2004
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The disclosed device is an additional, normally-closed relay positioned in line with the ignition switch and the functionality controlled by the OEM, normally-open relay. When the aftermarket system is in the disarmed state, the normally-closed relay is dormant in its closed position, thereby allowing the circuit to complete its intended loop. When the aftermarket security system is enabled, the normally-closed relay will open the current flow and prevent the current from reaching its target, thereby disrupting or disabling the operation of the vehicle function. If the normally-closed relay fails, it fails in its closed position, thereby not affecting the OEM system.
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