Former Honda owner here!
You might see the navigation system say something like this. Of course, there are 2 ways to fix this. The first is you can simply press and hold the (Power) button for two seconds; the system should reactivate.[br]
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Now worst case that doesn't work you can get the code from accura instantly by going here: https://dev.radio-navicode.acura.com/
To get the S/N from the radio, you just press "Settings" "Info" and "back" for 3 seconds, and with the knob, scroll to detail information and setting. Then go to Unit Check and then ECU info. You can [link|https://www.youtube.com/watch?v=qpE-QGSxkWA|follow this video here|new_window=true]