Just found this on another site. I'm going to go try it on mine now.
"From the Ford service CD:
Programming, Electronic Door Lock Control Processor
Note:
The remote entry features will not function when the key is in the RUN or ACCESSORY position.
To unlock the driver's door, press the UNLOCK button on the transmitter (which is programmed into the remote entry receiver module) once. This will also disarm the anti-theft system, if equipped.
To unlock all doors, press the UNLOCK button on the transmitter twice. The second depression must be within five seconds of the first UNLOCK depression.
If more than five seconds have elapsed since the first depression of the UNLOCK button, pressing the UNLOCK button again will only unlock the driver's door.
To turn on interior lamps (13776), press either UNLOCK or PANIC.
To lock all doors, press the LOCK button on the transmitter once.
To confirm that doors have locked, press LOCK button again, within five seconds of the first depression. This will beep the horn (13832), flash the parking lamps and lock all doors again.
To activate the personal security alarm, press the red PANIC button. The horn will beep and parking lamps (13201) will flash for a maximum of two minutes, forty-five seconds.
To deactivate the personal security alarm, press the red PANIC button again or turn the ignition switch (11572) ON.
Note:
The remote entry receiver module erases all previous transmitters from memory when the transmitters are programmed or reprogrammed. The remote entry receiver module can store up to four transmitters in memory.
To program (or reprogram) transmitter(s) into the remote entry receiver module, perform the following steps:
1. Turn key to the ON or ON/ACCESSORY position and momentarily short the two terminals of the program connector (C4) (a two-pin connector taped to the wire assembly connected to the remote entry receiver module, approximately 6 inches from the remote entry receiver module). All doors should lock then unlock. Remove shorting pin.
2. Press any button on transmitter. All doors should lock then unlock to verify that the transmitter has been programmed. If door locks do not respond, press button again (up to three times maximum with the same transmitter).
3. Repeat Step 2 to program additional transmitters into the remote entry receiver module (up to four transmitters maximum).
4. Key off. All doors should lock then unlock.
5. Check operation.
"