My 05 duramax came with the 2 gm remotes as well as another remote that has no label but has a remote start function. On the windshield behind my rearview mirror there is a antena and and a small reciever that has an OHM symbol on it so I figured it might be an omega brand and after searching there is a company called omega. But anyway were would the main box for this reciever be located? The wires are going up into the headliner. The reason im trying to find this out is the remote start button does nothing but make a click under the hood from some relay I would assume, so I want to make sure that the remote starter is even compatable with a diesel.

anyone?