Elektronische Wegfahrsperre für ein Fahrzeug, insbesondere Kraftfahrzeug

摘要

The invention relates to an electronic immobilizer for a vehicle, especially an automobile, comprising an operating assembly and an identification unit for authorization. Said operating assembly and said identification unit are provided with matching codewords. These codewords are requested and checked to see that they match by a control device in the vehicle during a question and answer dialogue. Authorisation to access and/or start/drive the vehicle is only provided to the operating assembly if the codewords match. According to the invention, this anti-theft device is improved considerably by one codeword being stored in an additional code memory (CSP) in the vehicle, said code memory participating in the control device (STG) question and answer dialogue via an additional communications route (KS). In the event that the control device (STG) does not receive an activate signal or receives an incorrect activate signal, it blocks access to the vehicle, the vehicle starting process and/or the vehicle driving process, via the assembly (MST).