Prius I - Diagnostic System Mode
 

From my 2001 Service Manual:

(1) Vehicle speed is 0.
(2) Parking brake switch is pressed.
(3) Press the Display switch to display the Screen Adjustment screen. Display is next to the TRAF switch.
https://www.greenhybrid.com/share/fi.../IMG_2040s.JPG
(4) Repeatedly touch the upper and lower bottom parts of the left end of the screen 3 times.

When Diagnosis System mode is started, system check is performed at first and the check result is displayed.

To finish: Turn the ignition switch from ACC to OFF to finish the mode.

Re: Prius I - Diagnostic System Mode
 

SUPER THANKS FOR THE INFO...........DANKF6IQL:)