Unit Check (Quick Check): Display

This diagnosis does additional checks on the ECU bus between the audio-navigation unit and the navigation display unit. This test also checks the internal electronic functions.

• When the connection shows NG, first check for loose terminals at the audio-navigation unit and the navigation display unit connections. Next check for an open or short in the communication line between the audio-navigation unit and the navigation display unit. If the line has an open or a short, replace the affected shielded harness.
• If the Connection shows NG, the GA-Net bus line may be failure. Check for hard error codes (see How to Check Error History (Navigation DTCs) ).
  Fig 1: Diagnostic Screen Display - Software Version

  Courtesy of AMERICAN HONDA MOTOR CO., INC.