So I was working under the dash of my car the other day, and realized the previous owner had an Autopage RS-615 remote start installed, as well as a Directed Electronics 556U Universal Remote Start Interface. Looks like there are three relays hooked to the system (doors & trunk??). When I purchased the car, I only got one key, and no remote start transmitter.....I read on here that it's possible a second key is actually in the remote start system because of the security transmitter, but I don't see one anywhere, unless it's actually inside one of those two modules. If I'm reading the description of the Directed Electronics piece correctly, it sounds like that bypasses the security key.
Assuming this system is hooked up (appears to be) and working correctly, if I buy a replacement transmitter should it be plug-and-play, or would I need a second key? Anything else I might potentially need to get this working? The car is a 2006 Chrysler 300C SRT8.