Theory Of Operation
WARNING: This page is about a different car, the 2014 RAM 3500 HD and 2014 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
The Speed Control Switch Assembly is a smart device that sends signals via a LIN Bus circuit to the Steering Column Module (SCM). The SCM acts as a pass through that delivers the signals/inputs from the Speed Control Switch Assembly on to the Powertrain Control Module (PCM) via the Can Bus.