How do you reset anti theft on 2006 Cadillac CT's?

To reset the anti-theft system on a 2006 Cadillac CTS, start by ensuring that the vehicle is in the "Off" position. Insert the key into the ignition and turn it to the "On" position without starting the engine. Wait for about 10 minutes until the security light on the dashboard turns off, then turn the ignition back to "Off" and try starting the engine. If the system does not reset, you may need to consult the owner's manual or a professional for further assistance.