2009 chrysler sebring 4 dr

What would cause the remote start unit led not tp flash or turn on when plugging into power? I replaced it With a new unit and its still not working, I checked the red wires for power and the ground, and its getting power. The bypass seems fine as the green led flashes When I turn car on With key.

I just finished checking all the wiring to the remote start unit and everything.seems to be intact. I was wondering if I disconnected the power wires and the ground wire and actually plugged I in straight to the battery, would that allow me to test if the unit is working? Or do all the wires have to be connected for it to work? Should the led light flash when powered? I also held the valet button hoping to hear the car honk but it didn't