Remote Keyless Entry (RKE)
WARNING: This page is about a different car, the 2008 Ford RV Cutaway, 2008 Ford Econoline, 2008 Ford E450 Super Duty, and 2008 Ford Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
The RKE transmitter sends a frequency that is received by the VSM internal antenna. Depending on the frequency received, the VSM locks all the doors or unlocks the driver door. If the unlock frequency is received again within 3 seconds of the first unlock, the VSM unlocks all the doors.
If the frequency received is for the PANIC button, the VSM cycles ground to the horn relay and voltage to the parking lamps. The parking lamps and the horn continue to cycle until the PANIC button is pressed again or the ignition switch is turned to the ON position. The operating range of the RKE transmitter may be affected by aftermarket systems, dealer installed options, high power devices, or TV/radio transmission towers.