2010 Ford Mustang Owner's Manual - Page 104

Locks and Security 4. After three seconds but within 10 seconds of turning the ignition to the 1 (off) position, insert the second previously coded key into the ignition. 5. Turn the ignition from the 1 (off) position to the 3 (on) position. Keep the ignition in the 3 (on) position for at least three seconds, but no more than 10 seconds. 6. Turn the ignition to the 1 (off) position and remove the second previously programmed coded key from the ignition. 7. After three seconds but within 20 seconds of turning the ignition to the 1 (off) position and removing the previously programmed coded key, insert the new unprogrammed key (new key/valet key) into the ignition. 8. Turn the ignition from the 1 (off) position to the 3 (on) position. Keep the ignition in the 3 (on) position for at least six seconds. 9. Remove the newly programmed coded key from the ignition. If the key has been successfully programmed it will start the vehicle's engine and will operate the remote entry system (if the new key is an integrated keyhead transmitter). The theft indicator light will illuminate for three seconds and then go out to indicate successful programming. If the key was not successfully programmed, it will not start your vehicle's engine and/or will not operate the remote entry features. The theft indicator light may flash on and off. Wait 20 seconds and you may repeat Steps 1 through 8. If failure repeats, bring your vehicle to your authorized dealer to have the new key(s) programmed. To program additional new unprogrammed key(s), wait 20 seconds and then repeat this procedure from Step 1. ACTIVE ANTI-THEFT SYSTEM (IF EQUIPPED) The active anti-theft system is designed to warn you in the event of an unauthorized entry to your vehicle and is also designed to help prevent the unwanted towing of the vehicle. When the vehicle is locked and armed, the active anti-theft system monitors the following: • Doors • Hood • Trunk • Movement inside the vehicle 104