333arod333

Hello everyone,

2011 E-350 Harmon Kardon sound system

Last night my audio went out. Tried restarting the car and doing the command unit reset in system menu and nothing. The only thing that stands out to me is that I have lost the aux option in the audio menu which I used on a daily basis to play from a Bluetooth transmitter, the satelite radio option now says device unavailable when selecting sat radio, and when I go to the nav screen the traffic option is missing which was always there since owning the vehicle. I have been reading about this but don't see the exact circumstances on any post.

Interestingly enough, now the Bluetooth audio streaming option is available in the audio menu, even though the aux option has disappeared. It pairs with my phone, but still won't play sound. This option was not available to me before sound going out. Nothing has been updated recently, it simply lost all audio while driving.

Can anyone chime in with the same symptoms or any help?

Does it make sense that I'm thinking it's the satelite receiver antenna? This is because I lost the sat radio function which was present before, just needed an activation, as well as the Sirius traffic option on navigation. This is frustrating, but I can do some quiet driving until I figure it out. Please help.

Thank you very much

CaliBenzDriver

You are pointing at your Satellite module as the source of silence for the whole audio system.

Have a quick look in rear left trunk side for any obvious issue with harness or water intrusion.

Can you scan your car modules to retrieve known faults through OBDII? (Satellite, COMAND and I believe AUX should show up alive).

More advanced troubleshooting is done with a MOST dongle to bypass questionable modules one at a time.
🤞

333arod333

Thank you for the response,

I was thinking of the satellite module as well, I can scan it with my autel scanner to see if there are any trouble codes for the sound system.

Can you give me an idea what the satellite module looks like on the left side of the trunk please? If I do have to order a new one, are there any special considerations for ordering the part or will it be Plug and Play If I get a functional unit used from eBay? I'm asking because I know there are several different variations of the sound system, but I'm not sure if the satellite module would just be the same for all options.

Thank you very much

konigstiger

333arod333

Thank you very much for the help. Are these all the same for the w212 or do I have to get a specific model or version that is specific to my audio system configuration?

konigstiger

If replacement matches part # in vehicle could be plug & play having said this, see line 1 of attached PDF in my previous post. Provide VIN to see if EPC shows 1 # or additional compatible part #s for your VIN. But here's the thing, you do not definitively know this unit is bad, have someone pull fault codes using MB diagnostics.

333arod333

Thank you for the support. I will scan the system with my autel scanner which will access the audio computer.

If the unit is faulty, will it definitely throw a code, or do they sometimes fail without triggering a code?

Also, do u mean provide the vin to the place I'm buying the part from or post it here for a list of compatible part numbers?

Thanks again

konigstiger

Your vehicle VIN.

333arod333

Satelite receiver with exact part numbers replaced. Still no sound. No aux present. Sat device not available. Is this a faulty unit that I ordered or is there a different problem? I will re-read the codes now.

333arod333

I was able to pull some codes from my autel scanner. There is one that came up on my scanner and also exists in the engineering mode for the comand unit history. It is D019, MOST communication faulty/fault at ring 2. There are also codes for the main and backup teleaid antennas D631 and D633 but I don't feel like these are the real culprit.

In addition, I also have a screen in my scanner where a test was done and I have a column with "actual configuration of most components" and sound system, sat radio, and media interface read "not configured". Also in the engineering menu, I have the screen which you can select the different sound components and activate Bluetooth sound and auxiliary video Etc, but audio auxiliary is not selectable and is in Gray Ghost writing that my cursor cannot select. The aux mode has also disappeared from my audio selection in the main menu. Tried a reset and to clear codes and lack of sound persisted.

Any help is greatly appreciated, I could really use it. Thank you.

Left Coast Geek

MOST is the fiber optical bus between the 'stereo' and the speaker amplifier.

CaliBenzDriver

"D019: MOST communication faulty/fault at ring 2".
that DTC provides you with a better idea of what's wrong.

Personally I have no clue which component hides behind the engineering name of Ring2. That module is likely not initializing and braking your media daisy-chain.

Media ring components


​​​​​​Watch "MB MOST BUS Ring Diagnosis"
https://youtu.be/GESOw8tkQcQ
... Shows how to test the optical fiber.

++++ EDITS++++
Quote: "There are also codes for the main and backup teleaid antennas D631 and D633
but I don't feel like these are the real culprit."
> Based on all that limited info... I guessing the TELEAID is indeed your bad guy! Play around with it a bit.

😊

333arod333

Got it. I'll have to see if my autel scanner can access that list of assigned components. In case I can't find it, is there a way to access the list of components designated to the different rings in the engineering menu?

I have already replaced the sat module so I'd imagine that's not it, unless the unit I replaced it with was also faulty. It's funny how my aux has disappeared and the traffic label on nav screen is gone, but there's no definitive way to use that info...

I'm guessing ur right and that the teleaid would b that ring, since I have codes for it, but I'll have to make sure. Any idea where the main and backup antennas for teleaid are?

Thanks again!

​​

CaliBenzDriver

The YT Video above describes how the list of active devices gets scrambled when one goes missing. It's like a blackhole gets created and the finger is pointed to the wrong device that showed up. This wrong behavior is interesting for us to know: don't trust MOST 100%.

The TeleAid module is working with a cellular carrier. Your "antenna fault" essentialy complains about.... no reception!
As you may have heard already, AT&T is in the process of decommissioning 3G towers.
Try resetting your TeleAid then looking at live data and at some point simply bypass the fiber to see if joy returns.

See how simple scanning lead us from darkness to light ... free, no parts needed

Scan the whole car some more, you'll never guess what else you find!

Speaking of antenna, I just found this one today that looks very much like a cellular GHz band:

rear shelf coax antenna
This aerial is so cheap it has nothing that can go bad: 1 sma + 1 resistor (750R).

Imagine the situation if turning off 3G is silencing MB audio around the Americas.

333arod333

Is there a way to reset the teleaid? Also, can anyone point me to where the teleaid module is located so I can try to bypass it with a loop?


Thank you all again for the help, I really appreciate it.

CaliBenzDriver

RESET /TEST:
To reset this module, simply use your trusted scanner.
Try to poke its live data fields to see if the module is functional ("door stop" vs. "almost good"?)

LOCATION:
You can usually find this hardware in the forward part of the trunk towards the rear passenger seat.

FIX:
If you can confirm this is the braking point rhat interrupts your fiber signal relay AND it keeps packing the same errors despite of a few resets THEN my best bet is you will need to get it flashed with the latest firmware update.

Plan-B:
My bush fix would be to bridge the fiber over with shipping tape eye-to-eye. This will disable all emergency automated calls by TeleAid.

333arod333

Thank you very much for the support. As far as the location for the teleaid, do you mean behind access panels in the trunk where the first aid kit is?

CaliBenzDriver

TeleAid module is commonly located in the trunk floor behind the rear seat, nowhere near that precious 1st aid kit.

Remove the trunk floor liner to expose access.
✌️

Left Coast Geek

I note there's a couple different PNs depending on the options and year you have (some are for 'not MY 2016', suggesting that there's a different one for 2016 cars which also have an updated COMAND).

333arod333

So I haven't been able to get this right yet. Most recently, I found the teleaid under the trunk liner towards the front, but my bypass loop did not fit into this male fiber optic plug that plugs into the teleaid. The loop I have does work on the male plug on my satelite receiver module, but the plug on the teleaid has the fiber optic cables set wider apart from each other than on the sat radio receiver.

Is there something I'm missing here? I can't see a different (wider setting) fiber optic loop online, so how do I bypass this teleaid module? All the loops I've seen look the same on terms of the width of the cables. Am I supposed to disassemble the cables from the connector and then use my loop?
I left my scanner at the shop so I wasn't able to scan it again today, however I did also find 2 other sets of fiber optic cables leading to a small device to the right of the teleaid. The loop didn't fit in these cables either.

I'm sure I'm getting something wrong, can anyone think of anything?

Thanks again for the help.
​​​​

S-Prihadi

Simple question : Have you check all the fuses related to audio/radio system ?
Rear SAM has fuse 84 :
Valid up to 31.05.2010 with CODE 536 (SIRIUS satellite radio): SDAR/high definition tuner control unit (N87/8)
Valid as of 01.06.2010 with CODE 536 (SIRIUS satellite radio): Satellite digital audio radio (SDAR) control unit (N87/5)
Valid with CODE 537 (Digital radio (DAB)): Digital Audio Broadcasting control unit (N87/3)

Fuse 85 for newer cars, mentions SIRIUS too. Fuse 83 mentions TELE AID.
See attachment, check yourself yah.

333arod333

Hello everyone sorry to revive this old post but I just got around to looking it over again. It seems that the ring failure on most ring to indicates that the most ring to is assigned to the sound system. I don't know if this means that it is a fault in ring 2 and the sound system is assigned to it meaning that there is a problem with the amplifier or that I'm missing something here.

Does anyone know what a most ring faults for position two (sound system) would mean?

konigstiger

Best to have someone with Xentry (MB diagnostics) erase stored codes & retrieve any new via quick test. Reluctant to do so and rather replace parts next logical part would be amp. Need VIN again to pull part #.

Ceric

I have what feels like exactly the same problem right now.

I have absolutely no sound coming from my speakers.

I can tune the radio to a radio station, and I see on the head unit the name of the station and the song that's playing but I have no sound.

My phone will connect to the cars Bluetooth, and if I answer the call, I hear no sound, but the person on the other side of the call can hear me speaking (so the cars microphone works).

I have an active SiriusXM subscription for the car, but now when I select satellite radio on the car, it just says Not Available on the satellite radio screen.

Everything works except no sound and no satelite radio.

I only have an iCarsoft MB 2.0 scanner so I have nothing advanced that it really good and capable. And with the MB2.0 scanner I have no error codes on the head unit.

My next step is to search someone neat me with a Mercedes STAR system to scan my stuff and pay them to pull the error codes.

Does anyone have any extra info on this?

pb39374

Hey - if you put a CD in, can you hear sound with that? Have you tried to disconnect be battery for a minute and then reconnect? I’ve lost sound twice over the last 5 years (NO SAT showed up on the head unit). Disconnecting and reconnecting the battery did the trick both times.