I have two questions I need help with:

1). I've plowed through all the CLM posts I can find, but I don't see any guidance on this problem.
In short, the fob won't lock or unlock the car, but flashes the lights and sets the alarm. But it's NOT the pump - I swapped pumps with a donor car and the problem did not migrate to the donor. The system in the donor car works on either pump. Neither pump will operate in the new car. I am very sure that the pump isn't running at all, total silence.
The wiring and connectors look very clean, but I don't know how to confirm if they are operational.
2). I was thinking it may be the Relay Module or BCM. I could try swapping one or both of those, but not sure if they are compatible. Donor is a 2004 Limited Coupe. New car is a 2005 SRT6 Coupe. Would it make sense to try swapping in those boxes? If so, would it be safe to do that?