Patent ID: 7576637

Claim:
A vehicle security system for a vehicle of a type comprising a vehicle data communications bus extending throughout the vehicle, the data communications bus carrying data and address information thereover, and connected to a plurality of vehicle devices, the vehicle security system comprising: a two-zone shock sensor to interface with the vehicle data communications bus extending throughout the vehicle and carrying data and address information for generating a pre-warning signal based upon a sensed low threat level condition and an alarm signal based upon a sensed high threat level condition higher than the sensed low threat level condition; an audible alarm indicator; and a vehicle security controller cooperating with said two-zone shock sensor, interfacing with the vehicle data communications bus extending throughout the vehicle and carrying data and address information, and being connected to said audible alarm indicator independently of the data communications bus, and for causing said audible alarm indicator to generate an audible pre-warning indication based upon the pre-warning signal for the sensed low threat level condition or for causing said audible alarm indicator to generate an audible alarm indication based upon the alarm signal for the sensed high threat level condition so that the audible alarm indication has a greater volume than the audible pre-warning indication and so that the audible alarm indication has a greater duration than the audible pre-warning indication.