S550Stuntin

tusabes

Vasco Floyd

You have video om your 2007 S550 ? I dont and d never have.

alexander nunez

Most of the time is the amp that goes bad, but you need to jumper the optical fiber on the siriusxm module and the voices module. But also could be the unit, since you said you didn't use it for a while, the command unit goes to protection module and loose the firmware.

BOTUS

every single one dies.... either the small one or the really expensive bigger amp

they aren't that dim, they designed that it would last 7 years.... long enough to claim acceptable life for a component subject to heat and humidity variation that a car gets..

its fits alongside this sort of thing

2 year cycle brake fluid is only a german get out of jail free card for the manufacturer.... they design the ABS units to die to time. if you keep paying the franchise for full service each year, on their electronic service records they can see you already paid out in mug fees way more than 3 ABS modules worth already, so they take the hit on the ABS module.... but as NO one does that for the 6 years it takes to die....they can say oh "it broke because the fluid wasn't changed". Which is utter codswallop … although not a bright idea you could leave the fluid in there 15 years and the brakes will work just fine... up to the point the designed in electrical and or mechanical failure pops up (on elements where the fluid has no bearing on the way they failed whatsoever)

Andre Klupsch

"Device Unavailable" message popped up last week, checked all fuses related to audio system I think using my fuse diagram. I did a scan and it had said during the wake test that the tuner no reaction but it was coded. Would this mean tuner is broke?
Thanks

alexander nunez

hello is possible that the tuner got Liquid damage, those tuner that's the main problem. Also could be the amp is bad, they all in the loop together. You can jump the tuner optical cable(fiber) with a jumper, get it from Amazon. If the amp is good you won't have fm station but the cd player will work. If by passing the tuner still nothing, your amp is probably bad.
What year and model is?

Andre Klupsch

My car is 2010 S550. I have checked for water didn't see any. On my scanner it says "no reaction, but coded " for the tuner.
Would that mean the tuner is bad and is the tuner part of the amp?
Thanks for your time

alexander nunez

This model got a amplifier (gateway) and the siriusxm module, is possible you found water just by looking outside most of the time the main board is damage.
We can take a look at it.
​​​​​

BOTUS

the FM tuner and the Amp are the same part,

other modules TV, DAB (Europe) or SIRUS (USE) connect to the MOST to do extras

alexander nunez

Not in those model, the tuner is the FM, AM and Siriusxm, the amp it just the gateway for the most ring.

Andre Klupsch

So as I understand it the HD Radio with Sirius is a tuner also, Then according to my scanner saying " No Reaction for the tuner" I would think it's the one broken.
Sorry for being long winded. And how do I make the pictures smaller.

alexander nunez

Yes just get a bypass loop and jump the optical, that way you will know for sure.
We can take a look if is not liquid damage we may fix it.

Andre Klupsch

Okay I'll try the bypass order one from Amazon. Do you sell them also?
Thanks

alexander nunez

Not at the moment. When you get it let me know because some people buy it and don't think it will fit. It that the optical have to be removed from the adaptor.

BOTUS

???? which models are you referring too

the 221 from 2005 to 2010 use a tuner amp TTU its an FM, SW, LW, MW, tuner and the cars main hifi amp in one....

then the OPTION of another sound source (sirus receiver) sits in the MOST circuit.

alexander nunez

the w221 from 2005 to 2009, 2010 up use the siriusxm module as tuner.

BOTUS

let’s pretend you aren't mistaken....

The volume is also jointly regulated within the amplification of audio signals run in the audio tuner control unit service sources in the same manner. (N93/1)

Here is a list of tasks performed by this unit.

• Controls audio processing and signal received via the fiber optic ring.
• Receives and processes the FM/AM/LW/SW signals.
• Processes RDS signals. RDS stands for Radio Data System. It is data that is transmitted alongside audio and may include station name, artist info, song name.
• Stores MOST central diagnostic settings.
• Serves as the Audio Amplifier for the loudspeaker.
• Sound processing and amplifying.

Andre Klupsch

Hi Guys, I didn't mean to start a debate. My car is a post face lift 2010 S550, In the trunk are the amp and HD radio with Sirius compontents see pict. My scanner said that the tuner "actual values, no reaction, but coded". Sat radio "reaction, and coded. So right now I'm waiting for a optical loop to check which part is not working.
Thanks again

BOTUS

I live near a company that specialises in in car entertainment upgrades for Mercedes cars. When my Amp first played up it was intermittent (like most - might limp on for 6 months sometimes perfect others a tiny glitch) . Then one day there is No audio anywhere and on FM radio, the station display is gone, leaving only the background menu colours. Everything works exactly as it ever did. TV, Sat Nav etc. just No audio anywhere.

When I described this glitch to that specialist, he didn't want money or to run diagnostics, he just said go on ebay and buy a new amp "its dead". I did that and never had a glitch since. Every post I ever read in the last 5 years has the exact same failure mode and after the owner stops wasting everyone's time and pays the hideous cost for a replacement part the cars are 100% normal again. It needs no diagnostics, no coding, no silliness, just a new part and it happens on most Mercedes and on every 221 and 216 ever made

Elbalt

hello, most likely your Amp in the back of the trunk in fried! This is very common with this car. I had the same problem few months ago. (Scroll up on this thread, you will see my initial post too).

I was lucky to find one at the Mercedes Benz dealership in September 2020 for $1,000 plus. Easy installation. Plug and play. Unfortunately, some dummy ran into my car about two weeks after installing and the insurance company totaled the car and gave me the current market value for the car. See attached pictures. Let me know if you’re interested willing to let it go at a reasonable give-away price. Comes with 90 days warranty too.

Elbalt

Hello, it could either be your turner/ satellite box or the amplifier both right next to each other in the back trunk. If it’s the satellite tuner, you can easily buy those on eBay for like $30. After replacing that and still no sound or nothing, then definitely it’s the amp. The big box in the back. Crazy expensive. I have a refurbished one in excellent working condition that I bought from the Mercedes Benz dealership in September 2020. Two weeks after installation, someone ran into my car and hit totaled by the insurance company. Willing to let go at a reasonable price and comes with 90 days warranty. Message me if interested. See picture below

Elbalt

Spot on!! I agree with you. That was the exact situation I was in about three months ago.

BOTUS

I just wrote this as a challenge for my brain and to explain how it all works for a different bug a chap has on another forum

cars are not the simple things they were...

the days of a small reliable single (radio) unit rammed in a hole with a tangle of wires, one of which was 12v. And on the front you had a proper knob that turned it on and did the volume, has gone.

In fact the world of car wiring was transformed some time after 2000 with some spookey weird beard lightweight wiring, all controlled by the CAN bus (Controller Area Network) https://en.wikipedia.org/wiki/CAN_bus

Alongside that oddity, car manu then decided what they really needed was a fast simple in car entertainment solution that was flexible and configurable to add toys on posh cars and leave them out of the cheaper ones. So they used MOST, (Media Oriented Systems Transport - a fibre optic cable link) https://en.wikipedia.org/wiki/MOST_Bus

With most cars running a hideous high voltage spark fest and I guess in their mind a bunch of other (electrically) noisy, nasty junk under the bonnet, placing a high end Hi Fi solution 2 foot away in a small space that's ever vanishing with more sophisticated AC systems, and with the need for it all not to jump out and hit you in the face when you crash, they moved much of it to the boot !!!

I guess much of it is a bit like posh home HiFi. If you can separate out individual components with baby low noise power supplies, each unit can have its own well shielded intricate circuitry. Thus you should get better sound quality, and you can add posh versions of these "separates" and or extra units, for additional features on higher spec cars.

Using a combination of CAN mostly for control, and MOST for the noise and picture transfer, they daisy chained all the separate bits together and wiz it to the front of the car at the speed of light.

Thus on your car the radio is not One thing, its up to Eighteen separate components. Not counting all the speakers which is at least 7 on the std car and 14 with the big amp ... (each bold bit is a physically separate unit all but 2 with their own software)

so turn the key with the "radio" selected to an FM station, then using either the Steering wheel buttons,
user input goes via the SCM, (steering column module),
with the same info reaching the COU, (central operating unit - the Comand knob and switch pack)
they both process user requests to control the COMAND Unit, that sits in the dash under the heater buttons.
in turn that feeds the picture you see and the changes you are making on the ZAN (central display)
or a cut down version in the IC (instrument cluster - third menu to the right using left steering button arrow).
A user input like Vol adjustment, I guess goes via the Central Gateway, CGW (the CAN master controller for everything on the car),
to the AGW, audio gateway in the boot (actually called the TTU on an S class, its an Amp with integral AM FM tuner to the layman),
that in turn is connected to the ANTENNA module in the roof and the cars loud speakers.
The OCP (overhead control panel) holds a microphone (might be for the phone as well) that takes ambient noise readings,
together with vehicle speed data from the ABS,
signals are processed in the Rear SAM and speed dependant volume control automatically adjust source (radio) volume,
and feeds TMC or SAT NAV voice overlay from the comand back to the TTU.

But then you can select other choices on the comand to do other stuff via additional optional extra modules
CTEL Phone
TV Tuner
DAB Tuner
Bluetooth Module
Media interface Module
GPS ANTENNA for the SAT NAV goes in the back of the Comand which also holds the Map data on a harddrive inside


The Steering wheel buttons and both antenna's are the ONLY ones without their own operating system and control software !!!
All are updateable with later software releases, except the steering wheel module that can't be flashed, but a later software iteration is on a new part

Depending upon which source or feature is in use, the ANTENNA module inside a posh Shark Fin module on the roof of most modern cars can do DAB, AM, FM, PHONE and SAT NAV signals to the car

Earlier cars like w211 can have another Nav unit on the MOST in the boot)
NTG3.0 you have an orange fibre cable loop between the Comand, the TTU, the DAB, the TV, (an iPod kit is only on the CAN)
NTG3.5 you have an orange fibre cable loop between the Comand, the TTU, the DAB, the TV, the Media Interface

where fitted, if one plays up they all play up

.

Andre Klupsch

Thanks Botus, Very informative, I know it's complicated so I have found a local tech who knows the system, Thanks for all the help.
My first upgrade AM radio was in my brand new 1973 Datsun 240 Z upgraded to a FM/AM 8 Track player, ya they are a lot more complicated now.
Thanks again