Frequency hopping for passive start and entry systems

摘要

A passive start and entry system (PASE) monitors several RF frequencies to detect a fob signal and for noise at each of the several frequencies. When the PASE system detects noise on the default frequency another RF channel is selected for communication. A vehicle unit sends a signal to a fob indicating which frequency the fob should use to transmit. The fob resets an RF sender to the selected frequency. At the same time the vehicle unit resets the RF receiver to receive on that frequency.