What is the history, has there been a re flash? The CCC can be reset by pushing the rotary push button and the eject buttons for the CDROM drive and the DVD drive.
You are correct in thinking that the 'head' unit or CCC is the controller for this system. CCC-BO is the user interface which is a board that is on the mother board in the CCC.
Have you scanned all control units on the audio and communication system?
What scan tool are you using?
A note to add, check in the boot for water ingress around control units and the display unit can fault with extreme temperatures.
You need to locate a reliable wiring diagram and check lives grounds ect.
Can you post last 7 digits on VIN.
Regards
Simon
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