Hello, I'm new for this forum.
Last week I set up AV adapter to have side view camera. Adapter is Audience AV link BM12 and completed.
In the mean time, I made some wrong connection but it was fixed.
What is my problem is during setting up AV adapter, center monitor display ring ( LED illumination ) did not work.
I did take our AV adapter but it does not work.

I'd like to know what kind of root cause can I consider.
Is that LED light unit or controller board problem or something related SW ECU?

Thank you.