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Hi

Is not exactly a repair, but could well be.
This car come to me some time ago to install/code a CD Changer.

CD changer Coding

   • BMW E60 CDC (CD changer) coding/progr...  

At the end I found that the optic fibre network was down.

In this video I take you through the process of finding where the problem was...
With the optic fibre network back on, the CD changer started working...

Is not a video with a lot of info, but hopefully will be able to help someone out there.
Hope you enjoy the video.
Any questions please put them below.
Like always, thank you for watching!