Headlights are consistently dim and orangey

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Bjartmarr, May 29, 2026 at 5:09 PM.

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  1. Bjartmarr

    Bjartmarr Junior Member

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    I have a 2013 Prius with stock halogen headlights. For years, the (low-beam) headlights have been kind of dim -- legal, probably, but dim. When I put my Prius side-by-side with my wife's 2105 Prius V (again, stock halogen headlights), the Prius V's lights are much whiter and brighter than mine.

    I've tried different bulbs -- OSRAM, and Sylvania Xtravision and Silverstar. There's no difference.
    I used a headlight polishing kit. The lights were a little brighter after, but still pretty dim and orange. I don't think the lens is the problem.
    I unplugged the bulb and measured the voltage in the socket with a multimeter, which is 12.0V with the car off and 14.4V with the engine on. Of course, that wasn't under load. Except for the load on the other headlight, I guess.
    I replaced the 12V battery with an OEM about two years ago -- no difference. The battery well was full of water at the time due to compost in the runoff channel, but I didn't see any corrosion on the battery terminals.
    I've replaced some of the tiny parking bulbs with LED's over the years because they last longer and I have big hands and it hurts to replace them. I wouldn't think that would make any difference to the headlight brightness though.

    Does anybody have any other ideas of what might be wrong?

    Edit: The only other electrical-ish problem I have is that the entertainment display goes black-on-white instead of white-on-black for about 5 minutes on cold/damp mornings. Again, I wouldn't think that would be related, but I figured I'd mention it.
     
    #1 Bjartmarr, May 29, 2026 at 5:09 PM
  2. ChapmanF

    ChapmanF Senior Member

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    I would probably proceed straight to using a pair of backprobes to measure the voltage right at the headlight bulb socket while the headlight bulb is present and operating, and let that result guide next testing steps.
     
    #2 ChapmanF, May 29, 2026 at 5:38 PM
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  3. Tombukt2

    Tombukt2 Senior Member

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    The generation 3 has a headlight harness problem that may be the cause of some of your problem led headlights will make hella difference I had on both gen3 20 and 13 huge difference . You need to crank the adjusters down about eight half turns then your cut off will appear set that at height .
     
    #3 Tombukt2, May 29, 2026 at 5:50 PM
  4. Brian1954

    Brian1954 Senior Member

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    LED low beam headlights make a big difference. Try it and see for yourself.
     
    #4 Brian1954, May 29, 2026 at 6:12 PM
  5. ChapmanF

    ChapmanF Senior Member

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    If backprobes reveal a low voltage at the operating headlight bulb while the car is READY, that could indicate a wiring issue needing to be corrected, which might affect LED retrofit bulbs as well. (Such a wiring issue would be the opposite of the one Tombukt2 is remembering, which resulted in a service bulletin; in those cars, the voltage getting to the bulbs was too high, and burned them out quickly.)

    The only measurement worth taking is with the bulb present (i.e. the wiring under load) with the car in READY. The open-circuit voltage with the bulb removed doesn't tell you enough, because the voltage drop under load is actually a design parameter in that circuit (as that old service-bulletin issue demonstrated).
     
    #5 ChapmanF, May 29, 2026 at 6:22 PM
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