U0203-Lost Communication With Door Module Front Left: Notes
WARNING: This page is about a different car, the 2011 RAM Pickup and 2011 RAM Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: CAN IHS BUS & TIPM CAN C BUS Circuit Schematic
Courtesy of CHRYSLER LLC
For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article