[obthomas]

I just looked in the wiring diagrams and it appears the fiber optics MOST originates in the OEM head unit and goes out to control the disc changer, amplifier and navigation. So if you are replacing the head unit you need to contemplate how the new head unit will be energized and how it will communicate with sub systems. In my case I did not have the sub systems and I controlled the head unit with an accessory power on. I suspect that if I had the sub systems, I would have replaced them to eliminate the fiber optics. Good luck you guys installing a new head unit.