Patent ID: 6525643
Filing Date: 2003-02-25
Classification: B60R

Abstract:
A vehicle theft prevention device including code obtaining means for obtaining a request code for requesting release of vehicle theft prevention control from a portable tool, memory means for storing a specific code allowing the release, control means for comparing the request code obtained and the specific code so as to release the vehicle theft prevention control when the request code obtained coincides with the specific code and to maintain the vehicle theft prevention control when they do not coincide, the vehicle theft prevention device, comprising:code changing means for changing specific codes at a predetermined changing time so as to invalidate a currently effective specific code so as to disagree with a request code from the portable tool; and canceling means for canceling invalidation of the specific code, under specific conditions, wherein the canceling means receiving a canceling request code sent from a portable tool other than the portable tool which sends the request code.