On Board Diagnosis: Notes

The trouble diagnosis function has a self - diagnosis mode for conducting trouble diagnosis automatically and a confirmation/adjustment mode for operating manually.
Self - diagnosis mode performs the audio unit diagnosis, and it indicates the results to the display.
The confirmation/adjustment mode allows the technician to check, modify or adjust the vehicle signals and set values, as well as to monitor the system error records. The checking, modifying or adjusting generally require human intervention and judgment (the system cannot make judgment automatically).