How do i perform the 2012 GMC Terrain anti theft reset?

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Tina S. December 15, 2020
To reset the anti-theft security alarm on Your 2012 GMC Terrain You need to lock all the doors, then unlock the driver side and put the key into the on position. Now turn it off and then back on twice and it will reset.Current automobiles use a theft-deterrent alarm system to prevent break-ins. The horn will sound while the headlights flash on and off. This will continue for several minutes unless You deactivate the alarm. After deactivating it, You can reset the alarm to ensure that Your GM vehicle security system is set correctly.
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Pierre M July 16, 2020
To reset the anti theft security alarm on the 2012 gmc terrain you need to lock all the doors, then unlock the driver side and put the key into the on position. Now turn it off and then back on twice and it will reset. If the immobilizer is messed up then the alarm will not work.
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Reggie April 10, 2023
The alarm won’t let me start car
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Ernie Oaks December 11, 2023
Done all that and it still doesn't work
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