Navigation Professional issues

[Alemito]

Hi everyone
I retrofitted Navigation Professional MK4 in my 2004 e85 and I have the following issues:
- no nav voice, no matter how I set things up. Wiring is correct, music softens when supposed to, but no spoken instructions.
- display brightness resets to 50% every wake up cycle
- I can’t access “onboard computer” setting from the radio service mode (see video, tv module not present: https://youtu.be/AY5yFn7wS08)
- digital cd changer input in amplifier no longer works
.
To me it’s the head unit that needs coding, but i tried several times and it won’t accept changes via NCS.
.
Any tips from you guys? Someone can maybe shed a light?

 

[Alemito]

SOLVED (partially).
.
I found out that the previous owner of the Navigation Computer had water ingress problems.
After completely losing GPS signal reception, i decided to take the unit apart to check for obvious malfunctions and VOILÀ, full of oxidation and burnt chips from water ingress onto the board.
Ended up swapping the water damaged unit for a new (used) one and all is fixed, the nav even speaks now!
.
I still can’t access “onboard computer” setting and have no digital cd changer input, as well as brightness resetting every wake up cycle.