pizzaguy,

Did the battery thing, no change. Lock makes the ALL EXTERIOR lights flash 3 times, unlock makes the ALL EXTERIOR lights flash once.
There are no other issues with the car, none. All exterior lights work, dash is lit up, cabin lights do NOT work and I read that they are interconnected to the lock/unlock feature.

Based on your routing description. SKREEM is doing it's job, BCM or CLP/SSM, or both, might be at fault.

Thanks for the assist.