Patent ID: 6169492
Filing Date: 2001-01-02
Classification: B60R,G07C

Abstract:
A method of user transparent auto re-synchronization for a remote keyless entry system comprising the steps of: assigning a default challenge-count window; receiving a first data packet including a first transmitter-side symbolic count and first command code; authenticating the first received data packet; assigning an auto-synchronization challenge-count window offset dependent on the first transmitter-side symbolic count when the first transmitter-side symbolic count is not bounded within the default challenge-count window; receiving a second data packet including a second transmitter-side symbolic count and second command code; authenticating the second received data packet; returning the challenge-count window to the default challenge-count window, when the second transmitter-side symbolic count is bounded within the auto-synchronization challenge-count window; and executing the second command code.