CL 2008 c216 radio stopped working

[Cipollini]

After some DIY service during weekend (brake rotors replacement, vinyl wrap the roof, etc.) I started the engine and only the MB emblem appeared on the screen. Then, only the air conditioning menu is visible. I cannot turn on the radio, access navi or car settings.
Everything was working before that day.
I tried it next day and another day as well, and only AC setting is working on the black screen.

What I remember is that I left switched ignition on during vinyl wrap because I needed to move the roof window. Could it enable some battery protection or anything?

Should I check all fuses or I need the STAR?

Thanks a lot

 

[Botus]

sounds a bit like your fibre optic link isn't doing its bit.... rear camera isn't on fibre optics (if u have that) does it work?

multiple modules chain together if one is down they all stay down, they are all in the left rear wing

 

[Cipollini]

Thank you for reply.
I have no idea what fibre optic link is or where it stays, but my rear view camera didn´t work long time before (waiting for a guy with Developer STAR to solve that).
But the radio, navi, car settings were ok, before the day I wrapped the roof. I think I made the mistake with leaving the ignition switched on, but I am not sure about that.
I also lifted the car with car jack to replace the rotors, but I don´t think it could affect my radio.

 

[Botus]

if you have no comprehension of how the systems works and no access to great diagnostic kit how do you think you can resolve a highly complex and unusual fault?

(and note a £3k snap on scanner with latest £1k a year update can't even communicate with the W221 interior toys !!!)


I wrote up a VERY simple guide to what's there and how it works at Christmas.....


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 spooky 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 a bunch of other (electrically) noisy stuff 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,
those signals are processed in the Rear SAM and speed dependant volume control automatically adjusts source (radio) volume,
and feeds TMC or SAT NAV voice overlay from the comand back to the TTU and a view on the ZAN.

But then you can select other choices on the comand unit to do other stuff via additional optional extra modules
CTEL Phone
TV Tuner
DAB Tuner (Europe)
SIRUS Satellite Radio Tuner (USA)
Bluetooth Module
Media interface Module
RFK rear view camera - feeds pictures to the ZAN via Comand which has menus to control, note IC has a menu to use RFK or turn it off
GPS ANTENNA for the SAT NAV option, it goes in the back of the Comand which can hold 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