Do they modulate or are they just opened or closed?
Active Grille Shutters
In order to improve the aerodynamics and maximize thermal efficiencies the Spark EV employs an Active Grille Shutter system.
The system includes a motorized actuator that closes louvers at the front bumper to enhance vehicle aerodynamics in driving situations where cooling and A/C loads are relatively low and high levels of front end airflow are not required.
The engine control module determines shutter state based on various vehicle conditions such as vehicle speed, coolant temperature, fan state, refrigerant system pressure, A/C compressor state and ambient temperature.
If high levels of airflow are required the active grille air shutter actuator opens the louvers.
WOT
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The system includes a motorized actuator that closes louvers at the front bumper to enhance vehicle aerodynamics in driving situations where cooling and A/C loads are relatively low and high levels of front end airflow are not required.
The engine control module determines shutter state based on various vehicle conditions such as vehicle speed, coolant temperature, fan state, refrigerant system pressure, A/C compressor state and ambient temperature.
If high levels of airflow are required the active grille air shutter actuator opens the louvers.
WOT
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My 2011 Volt has active grill shutters as well. That's what the salesman told me. 
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