Self-Diagnosis Mode

1. Start the self-diagnosis function and select "Self Diagnosis".
   • Self-diagnosis subdivision screen is displayed, and the self-diagnosis mode starts.
   • The bar graph visible on the center of the self-diagnosis subdivision screen indicates progress of the trouble diagnosis.
2. Diagnosis results are displayed after the self-diagnosis is completed. The unit names and the connection lines are color-coded according to the diagnostic results.

   Diagnosis results	Unit	Connection line
   Normal	Green	Green
   Connection malfunction	Gray	Yellow
   Unit malfunctionNote	Red	Green

   NOTE: Control Unit (display control unit) is displayed in red.

   • Replace display control unit if "Self-Diagnosis did not run because of a control unit malfunction" is indicated. The symptom is display control unit internal error. Refer to Removal and Installation .
   • If multiple errors occur at the same time for a single unit, the screen switch colors are determined according to the following order of priority: red > gray.
   • The comments of the self-diagnosis results can be viewed in the diagnosis result screen.

Detection Range of Self-diagnosis Mode 

• The self-diagnosis mode allows the technician to diagnose the connection in the communication line between display control unit and each unit and the internal operation of the display control unit.
• Because the start condition of diagnosis function is a switch operation, the on board diagnosis function cannot be started up if any malfunction is detected in the communication circuit between display control unit and multifunction switch.