How do you reset 2000 Chevy blazer security theft?

To reset the security system on a 2000 Chevy Blazer, first ensure the vehicle is in the "Off" position. Then, insert the key into the ignition and turn it to the "On" position without starting the engine, and leave it in this position for about 10 minutes until the security light turns off. Next, turn the key back to the "Off" position for a few seconds, and then start the vehicle. If the issue persists, you may need to consult a professional for further assistance.