Theory Of Operation
WARNING: This page is about a different car, the 2014 RAM 1500. However, it is still accessible from the selected car via links, so may be relevant.
The purpose of the diagnostic is to monitor if the hard-wired ignition signal state is equal to the ignition signal state received on the CAN BUS. The CAN message is sent by the Central Body Controller (CBC) to the Transmission Control Module (TCM).