Hey Heiko....thanks for getting back to me. I called a dealer before reading your message. Dont have any codes, dealer said to hold down "TP" button for 10+ seconds and would go through process of giving serial #, but that didnt work, and searching online says my model (CDR23) is a rare model that doesnt have codes. But, that being said, after car off for an hour, turned on radio, volume works again. I dont know what to make of that, a one time glitch or future issue that will happen each time. Hopefully it doesnt happen again, but any ideas how to solve if reoccurs, appreciate your experience.
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