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help radio volume knob not working

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E-Class (W212) 2010 - 2016: E 350, E 550

help radio volume knob not working

 
Old 12-07-2016, 11:09 AM
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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?
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Old 12-07-2016, 12:30 PM
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Sounds something simple, maybe loose wiring? I wounldn't go to a dealer for this issue, at least not yet.
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Old 12-07-2016, 05:45 PM
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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?
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Old 12-07-2016, 06:18 PM
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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.
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Old 12-08-2016, 02:07 PM
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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.
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Old 12-09-2016, 10:37 AM
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Originally Posted by SteveE400 View Post
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
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Old 11-06-2017, 02:27 PM
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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.
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Old 11-06-2017, 03:38 PM
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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.
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Old 03-10-2019, 07:54 PM
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The Fix

Originally Posted by JT550 View Post
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?
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.
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Old 03-10-2019, 07:56 PM
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Air might work, if the culprit is dust.

Liquid sprays are a "No-No."
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Old 03-10-2019, 10:39 PM
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Gonna give it a try

Mine sometimes take x10 more turns to lower it , like it doesnt do it instantly with delay
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Old 03-13-2019, 06:58 PM
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It probably wouldn't help but has anyone tried the 'hard system reboot' by pressing and holding the power knob for approximately 8 seconds?
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Old 03-21-2019, 11:05 PM
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bump, also experiencing this in my 12 CLS63
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Old 03-22-2019, 06:02 PM
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Originally Posted by SteveE400 View Post
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.
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?
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Old 07-06-2019, 07:03 AM
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Originally Posted by belarus27 View Post
Gonna give it a try

Mine sometimes take x10 more turns to lower it , like it doesnt do it instantly with delay
2013 Mercedes c250 volume nub on the radio and on the steering wheel not working. No sound but every other thing works fine
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Old 07-06-2019, 08:04 AM
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Originally Posted by JKwentzville View Post
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.
An insult before the fix: how nice Why did you bump this thread?
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