Theory Of Operation
WARNING: This page is about a different car, the 2017 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
The Radio controls and monitors both the microphone 2 input circuit (+) and the microphone 2 input circuit (-) for a concern. The Radio communicates over the CAN-Interior Bus. The microphone is located in the headliner.