How do you reset the theft system on srx 2004?

To reset the theft system on a 2004 Cadillac SRX, 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. Turn the key back to the "OFF" position, then try starting the vehicle. If the light remains on and the vehicle won't start, you may need to repeat the process a few times or consult a professional for further assistance.