Customer Support Prog ZHB Halogen bulbs

Discussion in 'Gen 3 Prius Audio and Electronics' started by Terrell, Nov 29, 2017.

  1. Terrell

    Terrell Member

    Joined:
    Feb 10, 2010
    158
    62
    0
    Location:
    Wisconsin
    Vehicle:
    2010 Prius
    Model:
    II
    Toyota sent owners of the 2010-2011 Prius a letter saying there have been a number of reports regarding the halogen low beam headlamps lifetime is shorter than expected, and Toyota is offering to install voltage adjustment wire harnesses and replace both low beam headlamp bulbs.

    My H11 bulbs seem to burn out more often than any other car I've owned, and I replace them at least annually. I called the dealership, and one of the service guys told me most customers need new bulbs every two years.

    Has anyone had this service done? (Install voltage adjustment wire harnesses and the bulbs.) If so:

    Has it caused your low beams to be dimmer? I would guess so.

    My guess is that since I run the low beams as running lights for safety, they just burn out more frequently than "normal."

    At night, I want as much light as possible, so if the wire harness makes the headlamps dimmer, then I'd rather replace them annually.

    Thoughts? Experience?
     
    wrydere likes this.
  2. wrydere

    wrydere Junior Member

    Joined:
    Dec 6, 2010
    11
    6
    0
    Location:
    California
    Vehicle:
    2010 Prius
    Model:
    II
    I am currently waiting for the parts to be ordered and will be getting the new wire harnesses installed within a week or so.

    The low beam bulbs in my 2010 Prius typically burn out once per year, always one before the other, and sometimes they have burned out in as little as 2 or 3 months after installing new ones. My car, I believe, is a textbook example of this wiring harness defect.

    For comparison, I don't think I ever replaced a bulb in my wife's 2008 Prius, which she had for six years.

    I don't think the voltage adjustment will noticeably dim the lights, but simply keep them from burning out due to fluctuating voltages.

    After all the evenings spent replacing bulbs in Autozone parking lots before a long commute home from work – and darn are they annoying to access in that compact engine compartment – I am quite happy that Toyota is finally addressing the issue, I just wish it had happened sooner.
     
  3. Terrell

    Terrell Member

    Joined:
    Feb 10, 2010
    158
    62
    0
    Location:
    Wisconsin
    Vehicle:
    2010 Prius
    Model:
    II
    I've changed them so often I can now do the left one in less than 60 seconds (it takes longer to open the package!), but the right side takes me maybe five minutes to jamb my hand in and twist the bulb out - the wires are too tight - I install the right bulb without the wires first, then connect them after the bulb is seated.
     
  4. wrydere

    wrydere Junior Member

    Joined:
    Dec 6, 2010
    11
    6
    0
    Location:
    California
    Vehicle:
    2010 Prius
    Model:
    II
    Yeah, the passenger side one is tricky. I find that if you remove the bolt holding the air intake, you can pull the air intake upright and give yourself an extra few inches of space, which makes it much easier. I eventually started carrying the appropriately sized socket for that bolt in my glove box at all times.
     
    xliderider likes this.
  5. LibrarySue

    LibrarySue Junior Member

    Joined:
    Aug 20, 2016
    4
    1
    0
    Location:
    Raleigh NC
    Vehicle:
    2010 Prius
    Model:
    V
    Ahhh, but less than a week after getting my letter, my Prius electrical system started acting weird. Then the battery died and I had to get it jumped. I'm wondering if this harness problem could be messing with my alternator.
     
    #5 LibrarySue, Dec 20, 2017
    Last edited: Dec 20, 2017
  6. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    83,689
    36,615
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    i wouldn't be surprised.
     
  7. padroo

    padroo Senior Member

    Joined:
    Jan 11, 2008
    2,758
    2,209
    13
    Location:
    Chesterton, Indiana Another third world country.
    Vehicle:
    2016 Prius
    Model:
    Four

    Prius does not have a traditional alternator.

    The Prius uses a DC to DC converter located under the inverter under the hood.
     
    #7 padroo, Dec 24, 2017
    Last edited: Dec 24, 2017
  8. DetPrius

    DetPrius Active Member

    Joined:
    Apr 24, 2009
    545
    91
    0
    Location:
    Southeast Michigan
    Vehicle:
    2010 Prius
    Model:
    III
    My 2010 passenger side low beam was still original when I received this notice, so it lasted 8.5 years. The driver side has been replaced 3 times, with the last 2 having lasted less than a year. I had the wiring harnesses replaced today, and of course they replaced both bulbs. I did not notice any difference in brightness tonight. The service adviser said they had to perform their diagnostics before they could replace the bulbs and harnesses. After the work was done, I asked what the diagnostics involved and was told there was really nothing, they just replaced it on my report of shortened life of the last 2 bulbs. Hopefully this is the end of this issue.
     
  9. kevelev

    kevelev Junior Member

    Joined:
    Mar 31, 2017
    57
    10
    1
    Location:
    ny
    Vehicle:
    2011 Prius
    Model:
    Two
    So I've had my dealer do this service and they didn't charge me anything. Before I even had a bulb go out I was thinking of replacing the bulbs with aftermarkets because I think it's really hard to see at night. Has anyone done this since getting the "voltage adjustment wire harnesses"?
     
  10. LibrarySue

    LibrarySue Junior Member

    Joined:
    Aug 20, 2016
    4
    1
    0
    Location:
    Raleigh NC
    Vehicle:
    2010 Prius
    Model:
    V
    I have no memory of this recall whatsoever...I don't know if I got that work done on my Prius or not. I remember the battery. Anyway,
    In July of 2018, someone had a heart attack in a parking lot and parked his car on top of my Prius. So I bought another one. And just had ZHB recall work done!
     
    AzWxGuy likes this.
  11. Terrell

    Terrell Member

    Joined:
    Feb 10, 2010
    158
    62
    0
    Location:
    Wisconsin
    Vehicle:
    2010 Prius
    Model:
    II
    Today (after all this time) I finally had the ZHB service performed, because I got tired of replacing the bulbs so often. (I probably spent over $300 over the years on new headlamp bulbs since buying the car.) The ZHB service is a free service listed at 2.9 hours. It took the dealer around 2 hours, because they need to install a "wiring harness" - it looks like they added some sort of resistor to slightly lower the voltage to the headlamps and wrapped the wires. They also installed new bulbs. So far I've not noticed that the headlights are dimmer, but they must be.
     
  12. ChapmanF

    ChapmanF Senior Member

    Joined:
    Mar 30, 2008
    7,792
    5,440
    0
    Location:
    Indiana, USA
    Vehicle:
    2010 Prius
    Model:
    IV
    By my measurements, it shaves about 0.55 volts off at the bulb, ending up a lot closer to an H11's rated voltage of 12.8. Because visible light output roughly follows voltage to the power 3.1 to 3.4 (closer to voltage squared is what you would think at first from Ohm's law, but higher output also shifts more into the visible region, hence the 3.1 to 3.4), this drop might shave 12% off the light output.

    But longevity follows voltage to around the power −13 to −16 (!), so the same voltage reduction could roughly double the life of the bulb.

    [​IMG]
     
    AzWxGuy likes this.
  13. AzWxGuy

    AzWxGuy Weather Guy

    Joined:
    May 22, 2011
    664
    288
    0
    Location:
    Tucson, AZ
    Vehicle:
    2011 Prius
    Model:
    Three
    I had the dealer warranty enhancement work done Feb 2018 and replacement bulbs continue to be functional. I had a headlight lens restoration done earlier, August 2017, which helped considerably with the quality and brightness of the beam. From where I sit in the car, I'm basically looking right down the headlight beam. So objects in the road are highly visible even on low beam. The halogen bulbs are a slightly yellowish cast anyway, compared to HID or LED. Hard to tell if the brightness has been reduced.
     
Loading...