Help! My 2005 Prius which has about 70K miles started having issues 2 nights ago- the dashboard display turns off when I turn the headlights on at night to drive... but I need the headlights on at night and also I need to be able to see how fast I am going/speedometer. Help? Please tell me this is an easy fix. I've googled and even read about turning the Prius into auxiliary mode and going through the computer menu but nothing is working. Help!
Is there a rheostat adjustment for the brightness of the dash lights? It might be that it got turned down all the way or that it might have gone bad. What you are describing would be normal when the headlights are turned on and this adjustment is focused all the way down, which would basically look like the dash lights were turned off. Try to turn the adjuster up (may have gotten turned down accidentally). If that doesn't work, you'll have to test to see if the adjuster itself has gone bad.