This vehicle has an anti-theft alarm system.

The indicator light, on the instrument panel near the windshield, indicates the status of the system: Off : Alarm system is disarmed.
On Solid : Vehicle is secured during the delay to arm the system.
Fast Flash : Vehicle is unsecured.
A door, the hood, or the liftgate is open.
Slow Flash : Alarm system is armed.
Vehicle Security
Arming the Alarm System#09-00-89-008A: Warranty Administration - Labor Operation 0600018 - Personal Property Damage - (May 20, 2013)
Subject:Warranty Administration – Labor Operation 0600018 – Personal Property DamageModels: 2014 and Prior GM Passenger Cars and Light Duty TrucksAttention: GMODC dealers are not authorized to use this bulletin.This bulletin is being revised to add model years, update the Labor Operation Infor ...