Ford 1998 Windstar Owner's Manual page 132

Anti-Theft System (if equipped)
When armed, this system helps protect your vehicle against
break-ins or theft.
When an unauthorized entry occurs, the system triggers and
will:
flash the low beam headlamps, parking lamps, and alarm
indicator lamp
honk the horn
disable the starting circuit to prevent the vehicle from being
started
Arming the System
Remove the key from the ignition.
1.
Lock the doors by using the power door lock switch. The
2.
alarm indicator light will now glow steadily.
Close all doors and liftgate. The alarm indicator light will
4.
then remain on steadily for 30 seconds and then go out.
When the light starts flashing, the system is armed.
NOTE: Be sure to close all doors completely. If not, the alarm
indicator light will remain on. Remember, your
anti-theft system is armed only after the alarm
indicator light remains on steadily for approximately
30 seconds after the last door is closed, and then goes
out.
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