How to reset securilock anti-theft system for 2003 ford thunderbird?

To reset the Securilock anti-theft system on a 2003 Ford Thunderbird, first ensure that you have the correct key programmed for the vehicle. Insert the key into the ignition and turn it to the "On" position without starting the engine. Leave it in this position for about 10 minutes; the security light will turn off, indicating the system has been reset. Finally, turn the key back to "Off" and then attempt to start the engine.