help radio volume knob not working
 

2011 E550 my radio volume knob quit working, volume on the steering wheel works fine. anyone run into this that can help before i do something dumb like go to the stealership?

Sounds something simple, maybe loose wiring? I wounldn't go to a dealer for this issue, at least not yet.

Haven't seen that on here before. Unfortunately, I doubt that is a separate part. Does the on/off button in the middle of the volume ring still work?

Yeah the on off still works as does everything but the volume, like I said the volume still works on the steering wheel. I talked to my friend who works in parts at my local MB dealer and he has not heard of this happening, he is going to talk to his master techs and get back to me.

If your 2011 model is like the Comand system in my 2015, you may have an unpleasant issue on your hands. The "Volume" knob is not a traditional potentiometer "volume control." The control in these systems is an optical encoder, a digital device. As such, it is not likely to be even remotely user-serviceable. Yes, there may be some fixes out there (similar to those for the Comand knob on the console), but this is not an old-fashioned wire-based component. It is a device with a precision control with a lot of attendant electronics to make it work.


My guess is that Maybe you can get that part of the Comand system and switch it out, but otherwise this will be a costly one to fix.

thanks for the input, like I said the volume works on the steering wheel so I have volume control. Not gonna worry about it till I sell it . I found some used units but need to pull it out to get number to match it up

2012 E550 4matic - Volume knob is not working in a linear fashion. I spin the knob and sometimes volume changes the same direction, opposite direction, or does pretty much nothing until I spin it about 5+ full turns. I have resorted to using the steering wheel control most of the time. Is there any known fix? I had an Acura that was helped some by spraying electrical contact cleaner under the knob, but the previous reply regarding this being optical puts me off from spraying that in there.

Too true, Jon. I would not spray anything in the control. The old style potentiometers (volume controls) had carbon resistance tracks with a brass tab that rubbed across them to vary the resistance (and volume). They did sometimes get dirty or wear, and sometimes contact cleaner sprays would help. With the optical encoders in use in modern systems, this is no longer the case. The only fix is to either replace the encoder or the entire chassis sub-assembly. We should consider ourselves lucky that we have the redundant control on the steering wheel. At least we can continue using the system.

The Fix
 

Don't listen to the knuckleheads giving advise. Mine was doing the same thing. I pulled the volume and power knob off and blew compressed air into the area. Reinstalled knobs and it works great now. The volume control is optical, probably got some dirt or dust in there. FYI I used shop air from a compressor and blower nozzle. I would imagine contact cleaner would work just as well.

Air might work, if the culprit is dust.

Liquid sprays are a "No-No."

Gonna give it a try

Mine sometimes take x10 more turns to lower it , like it doesnt do it instantly with delay

It probably wouldn't help but has anyone tried the 'hard system reboot' by pressing and holding the power knob for approximately 8 seconds?

bump, also experiencing this in my 12 CLS63

Just thinking out loud, so, a restart might be able to fix it? Long press on the radio On/Off button might be able to do the trick or worth a try right?

2013 Mercedes c250 volume nub on the radio and on the steering wheel not working. No sound but every other thing works fine

An insult before the fix: how nice :y Why did you bump this thread?

Let the Insults fly and the bumping continue!! This thread is exactly what I was looking for. First HIT on Google too - that's rare!

I was early for a meeting and searched this while sitting in a parking lot. Air compressor is at home of course. So what the hell... I just blew into the hole with my breath and it's working again! I didn't even know that knob came off so easily.

Thank you, everyone!

High tech or low tech... whatever makes the boat float. Good job. :y

Same problem
 

Try squeezing the knob while turning it. If that's the problem yank it out and see what you can do.

try squeezing it whilst turning!

I'd probably use 'canned air' duster, being careful to hold the can upright and not shake it so you don't get any liquid spray out....

I have the same problem
How you fix it
Which knob you took off? And how?

volume dial doesnt work
 

just like to thank the thread contributors.pulling the dial off and just blowing into it cured it for me,

So, now this error is in my car as well, volume control acting funny and slow. How did you guys pull the volume control off? Just brute force backwards? I tried, but is was pretty stuck - was afraid i would brake it off so I gave up.

dont use contact cleaner, that will gum up an optical encoder, just air, or a canned air duster.