Chevrolet 2011 Volt Collision Awareness Manual page 29

High Voltage Interlock Circuit (HVIC) System
The High Voltage Interlock Circuit (HVIC) is a safety system that monitors access to high voltage components. If the
high voltage disable procedure is not properly performed and service is attempted on the high voltage components, the
system commands the contactors to open within the drive motor battery. The Chevrolet Volt features two dedicated and
separate circuits, the main HVIC and the charger HVIC. The main HVIC monitors the primary high voltage components
and cables while the charger HVIC monitors the high voltage charger components and cables.