How do you reset 2007 Lincoln's navigator securilock passive anti-theft system?

To reset the 2007 Lincoln Navigator's Securilock passive anti-theft system, 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 until the security light turns off. Then, turn the key back to "Off" and wait for a few seconds before starting the vehicle normally. If the system continues to malfunction, you may need to consult a professional or refer to the vehicle's manual for further instructions.