Gray Tone

This diagnostic screen checks problems with contrast. You should be able to see the changes from bar to bar across the scale. It is normal for the two bars on either side to appear the same. If you can't see changes from bar to bar, replace the navigation display unit (see NAVIGATION DISPLAY UNIT REMOVAL/INSTALLATION  ).

Fig 1: Diagnostic Screen Display - Gray Tone

Courtesy of AMERICAN HONDA MOTOR CO., INC.