Method for operating a vehicle security system including code co

Details Method for operating a vehicle security system including code co Method for operating a vehicle security system including code co

1996-12-10

1997-12-30

Elms, Richard T.

Electrical transmission or interconnection systems

Vehicle mounted systems

Automobile

180287, 34082572, B60R 2504

Patent

active

057034133

ABSTRACT:
A security system for an automotive vehicle having an engine is operatively connected between engine running electrical components that are connected to an electrical power source and a lock switch having at least two operative positions. The security system has a key with a memory device carried thereon with a first security code stored in the memory device. A theft control module having a memory storing a second security code is operatively connected between the switch and the engine running electrical devices. The theft control module operates to first permit the engine running electrical components to enable the starting of the engine and then to compare the first and second security codes. Before starting the engine, a counter is compared to a predetermined number so that the engine starting is limited to only a predetermined number of attempts. The engine is disabled if the number of attempts exceeds the predetermined number. An engine controller further transmits a challenge code to the theft control module which calculates a response code based on a secret algorithm which is sent to and compared to a calculated comparison code using the algorithm by the engine controller.

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patent: 5519260 (1996-05-01), Washington
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patent: 5561332 (1996-10-01), Udo et al.
patent: 5637929 (1997-06-01), Treharne

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