Install Hualingan on e39/e53 DIY

[eurora borealis]

Thanks for your prompt reply, nezarnuaimat. I think you are right: I need to get an experienced electrician to have a look at it.
By the way - have you connected the illumination cable on the back of the HU to a power source? In case you have, do you remember what source/cable?
And the same with the reverse camera (I have an original one), do you remember where to locate the power cable for the reverse lights?
Is there anything that can be connected to the cables of the original HU. Now I have just stuffed those cables aside inside the dashboard.

Thanks a bunch for sharing. Very much appreciated.