RKE System
WARNING: This page is about a different car, the 2007 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.
The RKE transmitter sends a signal that is received by the SJB. If the unlock signal is received, the SJB unlocks the driver door. If the unlock signal is received again within 3 seconds of the first unlock, the SJB unlocks all doors. If the lock signal is received, the SJB locks all doors.
If the signal received is from the panic button, the SJB cycles ground to the parking lamps and horn. The parking lamps and horn continue to cycle until the panic button is pressed again, the key is turned to the RUN position or 2 minutes and 45 seconds have elapsed.