Break in the MOST ring? Fiber optic interconnect

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Hey have you guys had any success? I have had an issue of my own I'm trying to figure out. MY2011 LR4 LUX.

Last Fall, my sat radio went out. It went out in stages, with first no sound, then no channel display, then "searching for signal." I bought a replacement module on eBay and put it in with no success (passenger side rear).

A month or so ago, my screen went black. No radio, no backup camera, nothing. The Land Rover logo comes up for about 3 seconds every 3 minutes or so.

I continue to read and learn about the MOST system, and bought a fiber optic loop to bypass the sat module, but when I went back in there, I am getting no light from the cable. Well, I get a light for about a second every couple of minutes. So the bypass did no good.

So it appears to be upstream from there. My overall thought leads me to the head unit being bad, and I should just buy one off eBay (with a refund policy) and give that a go.

But one thing I cannot find is a US based 2011 LR4 MOST system diagram. I would like to check other modules, but I am not sure where they are, and in what order.

I tried accessing the NAV module under the passenger seat, but was unable to get to the connectors without removing the seat, which I have not done.

My Indy is willing to "start pulling things apart" at $265/hr, but I am trying to see what I can figure out on my own..
 

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