Small update.
After having to "manually" start/stop the car a few times, i now finally have a check engine light thrown. Pull codes, generic P0600 serial communication link code.
Got DRB3 up and running, it also is having issues connecting to any of the modules.

Pulled the BCM and checked for any cracked solder joints. All looks fine with that module.

Now to ponder some more lol

Oddly this thread experiences almost the same symptoms
https://www.crossfireforum.org/forum...0600-code.html

But. i have trippled checked the RCM, and soldered all joints and also tested all the relays for continuity. all seems to be in order......