Theory Of Operation
WARNING: This page is about a different car, the 2016 RAM 3500 HD and 2016 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 rearview mirror.