If the theft light it flashing you can try and disarm it by rolling the drivers window down. Then close the hood, hatch, all doors and then reach in and lock the doors using the master switch through the window. Wait up to a minute and unlock the door using the key then wait about 30 seconds and open the door. This should disarm the system.
If not, we need to try a battery disconnect for about 30 minutes.
Lastly you can try and sit with the key in the on position for about 30 minutes. This is a GM "trick" but it has worked on other vehicles.
https://www.2carpros.com/articles/how-to-reset-a-security-system
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Saturday, September 19th, 2020 AT 6:20 PM