When Monitored:
WARNING: This page is about a different car, the 2011 RAM Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
With the ignition on and battery voltage greater than 10 volts. Once the inverter switch is turned on, the Cluster (CCN) sends a request to the Totally Integrated Power Module (TIPM) to turn on the Inverter.