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!

 

[BigBriDogGuy]

I got a couple fiber optic bypass loops from Amazon (1 male, 1 female). My problem is the cameras intermittently go down and the audio gets interrupted in a pulsating 2 second continuous pattern. The audio icons on the display screen also gray out in time with the pulsating pattern. The control module for the cameras under the driver's seat doesn't appear to have a fiber optic connection. The box next to it seems to. Looking through the manual, I'm having a hard time identifying the second smaller module. Maybe the "Portable audio module interface"? It's all interrelated and complicated. Would be nice if I could use the loop to bypass the cameras to see if that fixes the audio. If so, I could isolate the problem to the cameras.

 

[KarDenMar]

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..

Hey I have the exact same symptoms, black screen that cycles the Land Rover logo for about 3 seconds on and a few minutes off. Never advances past that. Same US based 2011 LR4 - were you able to solve and if so, what was ultimately the issue? Any details would be massively appreciated.

 

[Rover Range]

Purchase the optic bypass loops and try to bypass each module on the MOST Network.
Bypass the modules one at a time, cycling the ignition on each time.

 

[KarDenMar]

Purchase the optic bypass loops and try to bypass each module on the MOST Network.
Bypass the modules one at a time, cycling the ignition on each time.

thanks for the reply! I have the gap iid tool, it pulled a few codes that could be related. I've ordered the bypass loops and a returnable head unit in the meantime in case that turns out to be the issue.

any insight on this code? U0184 (2F) lost communication with audio unit.

it sounds like it could be a failure somewhere in the MOST network or the head unit itself. Not sure if the gap tool can help troubleshoot beyond this, if so please let me know.

 

[Rover Range]

I've never seen a broken MOST ring.
Not to say it can't happen.
When you disconnect the MOST connector, you should see a red light in the module's connector cavity.
Satellite modules are usually the culprit.

 

[itsaguything]

Exactly. The perspective that it must be the wiring/fibre is old school thinking.
A component gone bad? Water ingress caused the fault? Poor electrical source? Even the notion that the connectors have come loose is old school thinking that really can't be considered given the new style locking connectors.

But I didn't know it was typically the satellite module. Thanks @Rover Range !