S-Class (W221) 2007-2013: S 320 CDI, S 350, S 450, S 500, S 550, S 420 CDI, S 600

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Old Apr 4, 2017 | 10:03 PM
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Djackson13's Avatar
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2015 s550
Device unavailable

For some reason my command unit stopped functioning properly as I was driving. The radio seems to be stuck on the station that was on when it stopped working, the satellite radio gives a "device available" reading, the nav works display wise but I cannot get any sound from any items. I am due for a battery change so I am hoping this is tied to that. Has anyone ever had any experience with the command system behaving this way? Any guidance/feedback that can be provided will be appreciated.
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Old Feb 19, 2022 | 02:18 AM
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w221 350
Same here

I know it’s going back a while but did you get a fix? I brought a 2012 W221 with a faulty command head unit. I sourced the same model from eBay and popped it in. The screen is back with all car controls working, but I get "device unavailable" on radio, no sound on Bluetooth or other inputs either. Now I don’t think these units have to be recoded, if the functions match your car options but could be wrong. An indi specialist couldn’t diagnose it, I suspect the amp may also be knackered but if this is software related it should be easy to resolve?
I Just ordered the MOST loop so I can rule out the tuner / other box in the boot.
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