Patent ID: 6777826
Filing Date: 2004-08-17
Classification: B60R

Abstract:
An anti-theft system for a vehicle which comprises a first control unit operative to read in a first key code of an individual key through key code receiving means and a second control unit operative to control operation of an engine of the vehicle, said first control unit comprising:detection means for detecting an activation timing at which said second control unit is activated; first memory means for storing data of a second key code as a reference key code of an intrinsic key exclusive to said engine therein; collation means for making collation between said first key code read in through said key code receiving means and said second key code in said first memory means so as to determine agreement or disagreement between said first key code and said second key code before activation of said second control unit; second memory means for storing data of a result of said collation therein; controlling means for, when said detecting means detects said activation of said second control unit, providing said second control unit with an instruction of approval to operate said engine when said collation results in agreement between said first key code and second key code and an instruction of refusal in engine operation when said collation results in disagreement between said first key code and said second key code; activation means activated by the key for activating said first control unit in an event where said first control unit is out of activation when receiving a reaqest signal provided at a speed attaining timing from said second control unit; wherein said second control unit provides for said first control unit a request signal both at said activation timing and at said speed attaining timing, said first control unit provides for the second control unit one of said instruction of approval and said instruction of refusal in response to recepnt of said request signal.