Hard Key
WARNING: This page is about a different car, the 2006 Honda Odyssey and 2005 Honda Odyssey. However, it is still accessible from the selected car via links, so may be relevant.
This diagnostic checks the status of each of the hard buttons surrounding the navigation display. When each hard button is pressed, the corresponding item on the screen should flash "blue". Touch the return key to exit.
Courtesy of AMERICAN HONDA MOTOR CO., INC.