I don't own one, I'm just a parts guy.
Quote:
23 - Body/Exterior/GRILLE, Active Shutter/Operation
OPERATION
The AGS system is controlled by the powertrain control module (PCM) over a dedicated network LIN bus. When the ambient air and engine coolant temperatures are below a specified threshold, airflow across the radiator is not required. When airflow across the radiator is not required and vehicle speeds reach a calibrated threshold, the PCM will command the shutter vanes to close.
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It'd be interesting to see if any tuners can recalibrate the speed threshold, but simpler to just rig an override switch.