How do you reset security on 2005 Chevy Cobalt?

To reset the security system on a 2005 Chevy Cobalt, first, 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 on the dashboard turns off. After that, turn the ignition off, wait a few seconds, and then start the engine. If the security light continues to stay on or blinks, you may need to consult a professional for further assistance.