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Hi my name is ***** ***** I will be happy to assist with this today.In some cases I may need more info to assist better.I apologize for any delay.
There is a technical service bulletin on this fault here from Mercedes,bulletin number LI82.85-P-055695.I will post the info below.
The fault is the software in the command/radio itself.A dealer has to reset the radio by disconnecting power to it (removing fuse,etc.) then perform the software update.Once this is done this corrects this issue here.In some cases the bulletin also states that after the software update if it still does not operate then the radio/command unit will need replaced.
This is a common issue and in most all cases the software update corrects this here.A dealer will charge anywhere between a half hour and an hour to do this here.
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