Originally Posted by pizzaguy

I know the CLP/SSMs are all the same between all Crossfires. (Surprised me)
I want to say BCMs are the same but I can't say that for sure.

Sounds like your battery disconnect erased the sync between FOB and SKREEM Remote Entry function - which is very odd. I've had my battery disconnect for three weeks at a time and never once had to resync.
If you turn the key in the lock in the door, ALL locks should follow that. Also, the alarm should be disabled by that function, same as the FOB.

So if you can turn the key in the door and lock / unlock as well as activate and disarm the alarm, I'd focus on the CLP/SSM. If the system does not arm/disarm wiht the key in the door, its kinda hard to say if its SKREEM or CLP/SSM.
And yes, the BCM does play a role between the two. But I have a VERY hard time believing that a battery disconnect would cause the FOB sync to disappear.

There is something else at play here. Any chance of rodent damage SOMEWHERE to the wiring harness? How old is the battery?