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Working on/clearing codes in the climate control wouldn't have an effect on the COMAND unit, they'd need to enter into the radio/COMAND unit to change codes in the unit.
Are you sure the COMAND was added later, it was available on this model in the US. The SDS unit should be able to read codes and change the configuration if it's an MB unit, even a European version.
I'd tend to agree it's probably a bad VRU or CD changer, or possibly the phone PSE. Has anyone been taking anything apart in the rear 1/4 panel? The phone itself works (in the cradle, hands-free feature) just not the changer or the voice recognition?
Gilly
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