Ford 2009 F-250 Owner's Manual page 170

Locks and Security
If not successful, the new coded key(s) will not start the vehicle's engine
and the theft indicator will flash on and off and you may repeat Steps 1
through 5. If failure repeats, bring your vehicle to your authorized dealer
to have the new spare key(s) programmed.
PERIMETER ALARM SYSTEM (IF EQUIPPED)
The perimeter anti-theft system will warn you in the event of an
unauthorized entry to your vehicle.
If there is any potential perimeter anti-theft problem with your vehicle,
ensure ALL remote entry transmitters are taken to the authorized
dealer to aid in troubleshooting.
Arming the system
When armed, this system will respond if unauthorized entry is
attempted. When unauthorized entry occurs, the system will flash the
park/turn lamps and will sound the horn.
The system is ready to arm whenever the key is removed from the
ignition. Either of the following actions will prearm the alarm system:
• Press the
control on the remote entry transmitter.
• Open a door and press the power door lock control to lock all the
doors, and then close the door.
Disarming the system
You can disarm the system by any of the following actions:
• Unlock the doors by pressing the
transmitter.
• Unlock the doors with a key. Turn the key full travel (toward the front
of the vehicle) to ensure the alarm disarms.
• Turn the ignition to the on position with a programmed coded ignition
key.
Triggering the anti-theft system
The armed system will be triggered if any door or hood is opened
without using the key or the remote entry transmitter.
170
2009 F-250/350/450/550 (f23)
Owners Guide, 2nd Printing
USA (fus)
control on your remote entry