Originally Posted by TerryH
Didn't make much sense to me either but I didn't engineer it.
2011 Ram User Guide Page 9.......
Press the Key Fob LOCK button or the power door lock switch while the door is open.
Press the Key Fob UNLOCK button and turn the ignition to the ON/RUN position.
This is the same way it works on our 2011 Charger R/T as well.
Ah! I see what they are saying... to ARM it you can either use the key fob lock button OR the button on the door switch while the door is open. That way it will arm when you close the door. If you lock the door from the door switch with the door closed, it assumes you are in the vehicle and will not arm the system. That way you can arm it without having the FOB (if you just had a regular key).