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 Glow Plug Module is located next to the passenger side shock tower. The Glow Plug Module receives a signal and ground from the Powertrain Control Module (PCM). The Glow Plug Module supplies power to the Glow Plugs and a ground path is provided through the body of the Glow Plugs. The Glow Plug Module communicates with the PCM over the LIN BUS circuit.