No Audio - MBWorld.org Forums

Aug 8, 2022 | 08:46 AM

ghopkins

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2013 C250

No Audio

I have not had audio in my car for a few months now and started to diagnose the problem. I have pulled all fuses for the radio, amp, COMAND, etc for 30 minutes to perform a soft reset, which didn't fix anything. I checked the fuse on the back of the head unit and it is fine. I found a guy with the same amp that works and plugged his into my car and still no audio. My best guess is that I am having a signal issue with the optics between the head unit and the amp. Is there something else that it could be?

Oh, and I also took the car to a car audio specialist and they told me they thought the amp was bad, but that they weren't even sure that was the problem. Some help they were...

Sep 2, 2022 | 07:22 PM

6 of 8

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2010 E350 4Matic

Sorry to see that no one replied. I may have the same problem as audio completely went out on my 2010 W212 E350 today. If I figure it out, I'll let you know. Have you solved yours?

Sep 2, 2022 | 08:14 PM

ghopkins

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Joined: Mar 2021

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2013 C250

Quote:

Originally Posted by 6 of 8

Sorry to see that no one replied. I may have the same problem as audio completely went out on my 2010 W212 E350 today. If I figure it out, I'll let you know. Have you solved yours?

No I haven't yet. I swapped the amp and that didn't fix it. I checked the fuse in the back of the head unit and it was fine so I'm at an impasse. My next guess is that my optic cable is bad between my head unit and amp, but that's going to be a whole project. I'm waiting for cooler weather before I tackle it. Let me know if you fix yours!

Sep 3, 2022 | 08:14 PM

6 of 8

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2010 E350 4Matic

I did some searching to see if this was a common issue with my particular model (my E350 is a W212, yours is different of course but similar audio system design). I discovered a slew of similar failures reported when the cars were only a couple of years old. There were lots of "dealer fixes" including amp replacement that didn't fix the issue. The antenna module and fiber optic cable were also mentioned. In a few instances, It looked like a vehicle firmware update "may" have been succussful but I can't confirm that. Since it was a common issue, even with new vehicles, there must be a solution out there, just need to find it instead of reinventing the wheel. I plan to search for a technical bulletin on the issue but not holding my breath.

Sep 3, 2022 | 08:19 PM

6 of 8

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Joined: Sep 2022

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2010 E350 4Matic

Here's one of the forum links going back to 2012: https://mbworld.org/forums/e-class-w...functions.html

Sep 3, 2022 | 08:21 PM

6 of 8

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2010 E350 4Matic

Here's a Technical Service Bulletin Link (haven't had time to search it yet): https://www.tsbsearch.com/Mercedes-Benz

Sep 3, 2022 | 11:16 PM

6 of 8

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Joined: Sep 2022

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2010 E350 4Matic

I didn't find anything helpful in the Technical Bulletins, but this YouTube video shows exactly what mine is doing (not sure if same for you). Check out the comments and replies under the posting, you may find a solution there. One guy said his problem started right after the washing bay (car wash); same happened with mine. Another mentioned possible water damage on passenger floor and corroded plugs. Maybe related to the car wash? Lots of others mention fuses, the fiber optics to the media interface module (mine is not recognizing the media interface in the menu list so the fiber optic is definitely suspect), and amplifier failure (although you already checked that). I've pulled all my fuses (except the one behind the head unit), checked them, and reintalled with no success. Anyway, thought this link might help.

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Sep 8, 2022 | 04:46 PM

6 of 8

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Joined: Sep 2022

Posts: 7

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2010 E350 4Matic

No Audio - PROBLEM SOLVED

There are a series of modules in the audio system (radio, satellite, antenna, media interface, amplifier, CD changer, etc.). All are interconnected via fiber optics and, if any one unit fails, the fiber optic path is severed resulting in no sound. When I was initially troubleshooting, I connected my iPhone to the media interface module (the plug in the glovebox) to see if there was sound from that input. However, when I selected "Media Interface" from the audio menu, it said "No Device Connected" even though the phone was plugged in and playing music. Before doing ANYTHING else, I recommend checking the audio inputs.

I removed the glovebox (online videos were helpful), unplugged the optical cable from the media interface module (its mounted above and behind the glovebox), plugged a female fiber optic loop (

Amazon

) into the disconnected cable and... voila... music! In my case it was a failed media interface module. You can check other modules the same way. Just unplug the fiber optic cable going into the module you want to test, then plug the fiber optic loop into the disconnected cable. This method won't work for testing the amplifier though because the amp would be disconnected from the system/speakers (you said your amp was good anyway). Hope all of this helps someone!

I'd recommend checking the audio inputs first, it might point to the problem area as it did for me.