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Method for avoiding an unauthorized access to passive access-authorization system of a motor vehicle

  • US 20060077042A1
  • Filed: 09/29/2005
  • Published: 04/13/2006
  • Est. Priority Date: 09/29/2004
  • Status: Abandoned Application
First Claim
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1. A method for avoiding an unauthorized access to a passive access-authorization system of a motor vehicle having a vehicle-side transceiver and a portable transponder, the method comprising:

  • in case of a query signal having a first radio reach, transmitted from the transceiver to the transponder, reducing a second radio reach of a response signal transmitted by the transponder to the transceiver.

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