Hey Eric, welcome to my LR4 electrical hell....LOL.
I'll sum it up as succinctly as possible:
1. 2013 LR4 LUX & HD packages, Meridian stereo, rear DVDs, pretty much everything but surround cameras.
2. End of last August I was running a little environmental groundwater sampling pump off my battery, not too big of a load but I mistakenly left my truck off as I was dialing in pump flow and then I ran the pump for a while and killed the battery. Jumped with my portable lithium-ion jumper pack and all was well. Over the next few weeks I had a few occasions where I had to jump. Then the electrical system started having issues - truck would be totally dead, I'd jump, and it would start with Suspension Fault, do not exceed 30 mph, clocks would reset, temp would revert back to Celsius, etc. Restarting would clear suspension fault. So I bought a new battery and all was well until suddenly my radio started cutting out about every 5-10 seconds, would re-start radio after about 5 seconds. My phone was also disconnecting and then reconnecting in synch with the radio shutoff. By radio I mean every audio device - FM/AM/CD/Satellite. It was essentially rebooting or trying to reestablish connection every 5-10 seconds or so. This was end of Sept/first of Oct.
3. Keep in mind the only issue is the audio cutting out. My main control screen is fine, lit up like normal, HVAC works, dash lights are on, etc. The only issue is that the audio cuts out. I'm jamming to the Bee Gees' Stayin Alive on satellite radio and it just sounds like someone turns off the radio about every 7 seconds and leaves it off for about 5 seconds and then turns it back on. The little info area on the dash shows no info when radio is off and then shows satellite trying to reconnect or FM or AM station on then off then on then off.
There is also a split second of static or electrical buzz with each on/off/on cycle.
4. My local independent mechanic checked battery and alternator - everything checks out fine. Independent didn't want to try to reboot or reprogram the entire vehicle, suggested I take it to the dealer.
5. In mid October the dealer said there is a bad node in the stereo receiver module and it is losing it's connection. They said the entire main receiver module has to be replaced. It's the big unit that includes the CD/DVD player. The dealer gave me part # LR087427. Here's picture of the part in the dash and also on my desk next to the replacement part:
6. I found a replacement part from a 2012 LR4. Installed it and nothing. No audio whatsoever. When I hit the button to turn on audio, it just shows blank - the AUDIO OFF turns off and nothing. The touchscreen still works fine, just blank instead of FM or AM or Satellite or whatever. Then when I hit the off button it says AUDIO OFF like normal.
7. I finally took it back to the dealer last week. Same diagnosis. The "new" 2012 replacement unit I installed isn't communicating just like the original. Here is the dealer's write-up:
8.
But here's what's odd...when I picked it up from the dealer, I was back to having audio again for 5-10 seconds then it cuts off for about 5 seconds. So when the dealer was fucking with it they did something to bring it partially back from the dead, they brought it back to where I was with my original 2013 unit installed. So is this 2012 unit working, and was my 2013 unit working, and is something else in the "MOST ring" not working???
I also just cleared all my fault codes with the GAP tool and I've driven around for a couple days with my radio both on and off. No new codes related to audio or front controls, just codes related to my non-functioning parking sensors (aftermarket rear bumper with sensors deleted) and the puddle lamp on my driver's door doesn't like the LED bulb I installed (but the other three doors liked them fine, LOL), and something about my passenger side mirror heater electrical fault. I didn't even know I had heated mirrors.
Also note that even with my audio system off, I can still hear the split second of static or electrical buzz every 10 seconds or so as the system is trying to establish connection.
So now I need to do what Stew recommended:
So with the car on and radio turned on/ you go to the audio head and unplug it, look down into the connector and one light should be red or blinking red. Plug that back in and go to the next module in the loop and unplug that/ same thing should be there. keep repeating that untill you find where that MOST ring is incomplete.
But I've got some big jobs the next few days so I won't be able to tear into this until maybe Thursday or Friday or this weekend.