RNS-E D/14 can stay disconnected - it is on my loom. (I went from Concert II to RNS-E). My alarm works fine and I get no errors on scanning.
RNS-E pin B/7 to Connector III/Pin 1 - (this can also stay disconnected and the Bose will still work if all the other connections are made for pre-amp signals and amp power on etc.). I have got a feeling that my loom did not have this wire added as it was non-Bose - I recall adding two pre-amp wires signal. I have full control of Bass/Treble etc. on the RNS-E. My RNS-E is
software coded to tell it I have BOSE - my coding is 0309752 have TV input and Aux input and BT phone - the 9 tells it I have Bose, changing this to 1 would be a non-Bose set-up. I have no external CDC.
You can purchase repair wires from Audi and insert missing ones into the plug housings. I was sold a non-Bose adaptor loom by mistake, and added them to make it work, i.e. added the Rear pre-amp signals for the Bose amp - 2 wires, (LR & RR). All repair wires can be identified
here.
CD Changer may or not need coding, but if it is not working suggest you check all wiring for it - can you eject and insert CD's?
Can you see the CDC option in the source menu?
Not using a CDC myself as utilised Video input for i-pod sound and video.
There is a lot that needs to be checked for 100% correct coding and adaption - including getting instruments unit (Module 17) recoded to show Nav instructions, etc.
It all depends on what the donor vehicle had fitted and what this RNS-E was matched too.