I just purchased an '04 E500 in amazing condition with 150K miles on it. It's a incredible car. I wanted to add into the oem system the navigation which I don't believe was in the car when it was purchased new. I did the research to locate all of the parts needed for the upgrade and purchased and installed them. I am getting a " device unavailable" when I attempt to open the Navigation every time now. Can anyone share what I may have missed? Thank you!
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