How do I reset my 2003 chevy impala security system light?

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James M. January 7, 2021
You'll need to reset the anti theft system in order to get Your security warning light to shut off on Your dashboard. This will be done by putting the key in the ignition and putting the vehicle in to the on position and then turning it off. Now You'll need to wait 10 minutes and when You give the vehicle power again the light should have cleared itself. If this method does not work You can go ahead and just pull the battery from the vehicle for 20 to 30 minutes. Doing this will reset all codes and send the vehicle back to it's basic factory settings.
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Richard C. April 9, 2020
This will go out when you reset the anti theft. To do this put the key in the ignition then turn the car on and off after waiting ten min.
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Russell Smith May 23, 2022
Tried both methods.1st.method key to on then off for 10 min.came right back on.2nd method pull negative. Off battery 1/2hr.Worked for 30 min.security light back on?????
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