Theory Of Operation
WARNING: This page is about a different car, the 2017 RAM ProMaster 3500, 2017 RAM ProMaster 2500, and 2017 RAM ProMaster 1500. However, it is still accessible from the selected car via links, so may be relevant.
The RKE (Remote Keyless Entry) Fob is the right one for the vehicle but has not been programmed.