38 problems related to headlight switch have been reported for the 2004 Toyota Prius. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Toyota Prius based on all problems reported for the 2004 Prius.
For the last 30,000 miles on my 2004 Toyota Prius, left hid headlight keeps going off. However, when I switch headlights off and back on, it would go on, and stay on, for couple minutes, sometimes hours. After that it goes off again. At Toyota dealership they told me that computer with the headlight assembly must be replaced. It would cost me around $400. My car is still under warranty, but they said it does not cover it, even though at the day of the purchase of my car, I bought "bumper-to-bumper" additional warranty. Why the headlights are not covered remains a mystery. Research that I did on the issue, showed that many people are having the same problem with their Toyotas and have no choice but spend hundreds of dollars on something that looks like a defect in the headlight assembly. I think Toyota should make a recall for this particular part.
I own a Toyota Prius 2004 and the headlights go on/off whenever they feel like it. When they go off if you turn the switch they go back on. Are there any other complaints on this issue?.
Driver-side hid headlight turns itself off at brief intervals. Turning headlight switch off and on restores it, without fail. Situation remained stable for over a year, Nov. 2008 to Jan. 2010. Light turns out whether vehicle is moving or stationary. Replacing lamp did not fix the problem -- in fact, new bulb turns off more than once a minute, while old bulb turned off about every 10 minutes.