How do you reset the anti theft system on a 2004 Cadillac SRX?

To reset the anti-theft system on a 2004 Cadillac SRX, first ensure 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. After this, turn the key to the "Off" position, wait a few seconds, and then try starting the engine. If the issue persists, you may need to consult a professional for further assistance.