Circuit/System Description
WARNING: This page is about a different car, the 2012 Chevrolet Volt. However, it is still accessible from the selected car via links, so may be relevant.
The hybrid battery charger receptacle is connected to the battery charger through two 110/220 V AC circuits and one ground circuit. The battery charger receives serial data message from the hybrid powertrain control module 2 that the drive motor battery charger cable has been connected and then monitors the two 110/220 V AC circuits for proper voltage.