How do you reset 2007 Cadillac CTS theft system?

To reset the theft system on a 2007 Cadillac CTS, first ensure that the vehicle is in the "On" position without starting the engine. Then, leave the key in the "On" position for about 10 minutes until the security light turns off. Turn the key to the "Off" position for a few seconds, then turn it back to "On" for another 10 minutes. Repeat this process three times, and the theft system should reset, allowing you to start the vehicle.