Theory Of Operation
WARNING: This page is about a different car, the 2012 RAM Pickup and 2012 RAM Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
The Powertrain Control Module (PCM) transmits the Vehicle Identification Number (VIN) as a network message on the CAN C bus. The Totally Integrated Power Module (TIPM) receives and stores the VIN.