Break in the MOST ring? Fiber optic interconnect

[double 0]

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..

 

[MellonRover]

I had intermittent " no volume" randomly over about 10 months. Then one day, following a no volume system went dark.
The system blinks if it's looking for "complete circuit". I think it blinks and if sees a break it will stop blinking and " give up" sending a signal. Once it sees no breaks it goes solid. Using the test loop, I tried components until I found the under seat amp was where the " break" was. Replaced that amp and was back in business. The DVD player began working as well ( that used to error out).
Most of the MOST diagrams the signal starts at head unit, goes to rear components, then under seat amp then display. If you see blinking then it stops you have to pull the radio fuse(s) to get it to start blinking again to continue testing.
Good luck!