I sent my cd/ radio and amp to a car audio repair place. Hopefully they find something wrong with either one of them if not I’m really at a loss. I also have an Amazon green cruiser. I’ll keep you posted.
I have an amazon green cruiser too.
But I found this thread and it lines up with what chatgpt told me.
Screen 1: MOST Line Check
0: EMVN – OK: EMVN usually refers to the navigation ECU (Electronic Control Unit). “OK” means it’s communicating correctly.
- 1: AUDIO – OK: Audio system ECU is responding normally.
- 2: AMP – OK: The amplifier is communicating properly.
- 3: RSE – NCON: RSE stands for Rear Seat Entertainment. “NCON” = Not Connected, meaning the system is not detecting a connected RSE unit. This may be normal if your vehicle doesn’t have a rear seat entertainment system or it could indicate a fault if it does.
Screen 2: System Check Mode
- 0: EMVN – MOST (Red): Shows a fault or communication issue with the navigation ECU over the MOST bus.
- 1: AUDIO – (Blank): No current status shown; this may just mean no issue reported at this moment.
- 2: AMP – (Blank): Same as above.
- 3: RSE – OK: Now showing “OK”, indicating the RSE responded on this check.
- USB BOX – OK: USB input module is functioning and connected.
- MIC / VTR (checkboxes): Options to test Microphone and Video Terminal Receiver input manually, unchecked here.
- Memory CLR / Recheck: Buttons to clear stored fault codes or re-run the diagnostics.
Summary
There may be intermittent communication issues with the Navigation ECU (EMVN) or the RSE unit, depending on system presence and current state. If you’re troubleshooting audio or video issues, a consistent “NCON” or “MOST” error would warrant checking physical connectors, fiber optic cables, or possibly replacing modules.
Do you have a rear seat entertainment system installed?
yes I do
If you have no audio output at all and your 2011 Land Cruiser has the JBL Synthesis system with rear seat entertainment (RSE), and your diagnostic screens showed:
- AMP: OK in MOST Line Check
- RSE: NCON in one screen but OK in another
- EMVN: MOST error in System Check Mode
Then here’s the likely cause and steps to address it:
Likely Problem
The MOST (Media Oriented Systems Transport) bus is a fiber optic loop. If
any one device in that loop fails or disconnects,
audio system-wide failure is common—including front audio.
The intermittent status of your
RSE unit suggests it may be disrupting the MOST ring, even if other components show as OK. The EMVN (navigation) showing a MOST fault could also be contributing.
Steps to Troubleshoot
- Power cycle the system: Fully shut off the vehicle, open the driver’s door, wait several minutes, then restart. Occasionally, this resets fiber loop issues.
- Inspect RSE connections:
- Pull the RSE unit (usually mounted in the headliner or center console) and check connectors, especially the fiber optic line.
- Ensure no kink or break in the fiber.
- Bypass RSE unit: If you suspect it’s the fault point, a dealer or tech can use a MOST bypass loop connector (optical loopback) to isolate and confirm. You can also purchase one if you’re comfortable with interior disassembly.
- Inspect amplifier (under driver’s seat):
- Even if it shows “OK,” a failed amp can cause total loss of audio.
- Check for water intrusion or connector issues.
- Check for blown fuses:
- Look for fuses labeled “AUDIO,” “AMP,” or “RSE” in both the cabin and engine bay fuse boxes.
If you’re not getting anywhere:
You can try removing power to the RSE unit entirely (disconnect it) and rechecking the system diagnostics to see if the MOST ring reports as intact. If audio returns after doing this, the RSE unit is likely the failure point.
To diagnose the audio issue in your 2011 Toyota Land Cruiser, you can use a MOST fiber optic loopback connector to bypass the suspected faulty module under the passenger seat. This device helps in identifying faults within the MOST (Media Oriented Systems Transport) network by allowing you to isolate and test individual components.
- Juerly MOST Fiber Optic Optical Loop Bypass Female & Male Adapter: This adapter includes both male and female connectors, making it versatile for various testing scenarios. It’s compatible with standard MOST systems and is available on Amazon for $8.99.
Using one of these loopback connectors, you can bypass the suspected faulty module under the passenger seat and determine if it’s the source of the audio issue.
