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martin_lang1

Mercedes ML audio system failure

I've got a head-scratcher with my 2014 Mercedes ML, gasoline engine, clocking in at 244676 km. The sound system has completely given up. No audio whatsoever. I've scanned it and it's throwing an error code related to the audio system. I suspect the display is defective, which seems to be a common issue, and am looking at a potential repair cost of around 725€. Has anyone else experienced this complete audio failure in their ML? Is a defective display the most likely culprit, or am I missing something obvious? I've checked the fuses already. The volume control and dashboard controls are completely unresponsive, and all car speakers are silent, with no speaker crackle or any other sound.

Summary of the thread

The 2014 Mercedes ML experienced a complete audio system failure, with no sound and unresponsive controls. The initial suspicion was a defective display, a common issue, but other display functions were working normally, and temperature wasn't a factor. After considering a loose amplifier connection, the problem was diagnosed as a faulty MOST bus, which was replaced by a workshop, restoring the audio system.

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4 comment(s)

emmabrown1

Oh dear, a silent Mercedes is a sad Mercedes indeed! My initial reaction is one of utter sympathy. An audio system failure is an annoyance of considerable magnitude. Tell me, have you observed any flickering or other anomalies with the display screen itself prior to the complete audio failure? Has the ambient temperature played a role; does the sound system cut out on hot days or cold mornings? Are other functions of the display working normally, such as navigation or the climate control interface? Could it be something as simple as a loose connection at the amplifier? I know, a barrage of questions, but it's all in the pursuit of harmonious troubleshooting!

martin_lang1 (community.author)

Good questions. No flickering or obvious problems with the display itself before the audio went out. Temperature doesn't seem to be a factor either; it's failed in all conditions. Other display functions like navigation and climate control are working perfectly. A loose connection at the amp is a possibility I hadn't considered. Where is the amplifier located in this model? Is it easily accessible, or am I going to be contorting myself in impossible positions to get to it?

emmabrown1

Given the other display functions are operating normally and the temperature independence of the failure, a display fault seems less likely, although still a possibility. Locating the amplifier can be a bit of an adventure, but often it's located in the rear cargo area, perhaps behind a panel or under the floor. However, accessibility can vary. I would suggest consulting a repair manual or a trusted workshop for precise location and access instructions. Considering the cost of a potential display replacement, a thorough diagnostic check at a reputable workshop is highly advisable before committing to any repairs. They can pinpoint the exact cause with specialized equipment.

martin_lang1 (community.author)

Thanks, that's helpful advice. I appreciate you confirming my suspicion that a workshop visit is probably the best next step, particularly given the potential cost. I took your advice and brought it to the shop. Turns out the MOST (Media Oriented Systems Transport) bus was faulty, causing the audio system to fail. The shop replaced the faulty component and the sound is back. Thanks again!

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MERCEDES

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ML