Apparatus and method for disarming automobile alarm system

Electrical transmission or interconnection systems – Vehicle mounted systems – Automobile

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307 102, 307 106, 307 104, 180287, 701 36, 3404255, 340426, B60R 2510

Patent

active

058014551

ABSTRACT:
An apparatus and method for disarming an automobile alarm system uses the ignition switch of the automobile to create a sequential pulse access code. Toward this end, two commonly available electrical circuits in the vehicle's wiring that are switched on and of by the shifting of a vehicle's ignition switch among power-applying switch positions serve to supply a pulse code of sequential electric pulses to the alarm system to perform a selected function, including entering a valet mode or overriding and disarming the system without a remote control transmitter. Because the shifting of the ignition switch generates a two-wire detectable pulse code, previously-programmed pulse codes can be selected to perform different functions in addition to disarming the system, including using pulse codes to trigger entry of the system into a learning mode.

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Owner'Guide, Toyota VIP RS3000 (Jun. 15, 1995).
Installation Instructions, Toyota RS3000 (Sep. 1996).

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