E-Class (W212) 2010 - 2016: E 350, E 550
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Old Sep 12, 2024 | 05:02 AM
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No audio

Good morning fellas, about a week or two back I was cruising on the highway and suddenly the music cut out in an instant, everything else works as it should in the screen menu. When I checked the cars codes through the engineering menu this is what I got, is this simply a case of replacing the Bluetooth Phone Control module to restore sound?


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Old Sep 12, 2024 | 08:18 PM
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W212 MY'14 M276-3.5NA @75kMi
not obvious

there are couple known audio issues but there are couple different options in use.
So it's not trivial to gues right!
  • the head unit
  • the main amp
  • AUX interface
  • and MOST fiber ring
  • none of which are cheap or simple to replace!

Use a good MB scanner to pull faults.

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Old Sep 12, 2024 | 10:49 PM
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Originally Posted by CaliBenzDriver
there are couple known audio issues but there are couple different options in use.
So it's not trivial to gues right!
  • the head unit
  • the main amp
  • AUX interface
  • and MOST fiber ring
  • none of which are cheap or simple to replace!

Use a good MB scanner to pull faults.
thank you for the info, I will scan it soon to get the mb specific codes, what’s weird to me is this morning when I started the car up, the audio started blasting for about ten seconds then cut back out. Thought I lucked out but I guess not.
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Old Sep 15, 2024 | 01:56 PM
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2016 E350 4Matic wagon, 2019 Ford Expedition, 2019 Chevy Bolt EV
i'll hazard a guess that a connector is loose somewhere, maybe the MOST (fiber optic) output from the head unit to the amplification
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Old Sep 15, 2024 | 04:33 PM
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W212 MY'14 M276-3.5NA @75kMi
Originally Posted by 1bad550
thank you for the info, I will scan it soon to get the mb specific codes, what’s weird to me is this morning when I started the car up, the audio started blasting for about ten seconds then cut back out. Thought I lucked out but I guess not.
Works fine, for 10secs!

that's good news! This means your amplifier is not toasted.

I bet on it's a logical issue...
something on CAN-B ?
Media interface module ?
head unit itself ?
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Old Sep 15, 2024 | 05:17 PM
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Originally Posted by CaliBenzDriver
Works fine, for 10secs!

that's good news! This means your amplifier is not toasted.

I bet on it's a logical issue...
something on CAN-B ?
Media interface module ?
head unit itself ?
for the head unit


Does the internal control unit reset mean anything? Both the head unit and media interface module have errors
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