As of 2 days ago, when I switch on the headlights, I lose virtually all lights on the dash. The only remaining indicators are the "ready" light and headlights "On." I tried going to "display" while the lights were off and scrolling down to On/Off, but this was not the answer. Please help! THANKS!!
http://priuschat.com/forums/gen-iii...-need-help-about-dash-brightness-control.html (since I have no Gen 3). BTW, if you really have a 2011 Prius, you've posted in the wrong area. 2011 is Gen 3, not 2.
It sounds as if your dashboard dimmer control is dialed all the way down. Have you rolled the dial up all the way? And when it hits the stop, roll it a bit further until it clicks?
The dash brightness control dial is to the left of the steering wheel near the mirror adjustment buttons.
13 years later, I just had the same problem and this post gave me the fix. Thank you kind stranger from the past!