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Thread: H11 to H9 Conversion - 2018 Toyota 4Runner

  1. #1
    Unenlightened
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    Default H11 to H9 Conversion - 2018 Toyota 4Runner

    I just took delivery of a 2018 Toyota 4Runner, and one of the first things I decided to do was upgrade the lighting. Perhaps I should've asked these questions before actually doing the conversion, but this may sway whether I keep it this way or not. There's also plenty of info about how to do this procedure on the 4Runner forum, but I decided to ask this on here since there's a tremendous amount of lighting specific knowledge here.

    Stock high beams were 9005's in reflectors, so I put some Philips 9011 HIR's in their place after making a minor tab modification to them; this conversion worries me the least since they match the stock wattage, so I think everything should be good to go here.

    Stock low beams were H11's in projectors, so I modified some Philips H9's to go in their place. This is the conversion that concerns me the most. Based on wire gauge, I think I'm fine with the additional 10W per bulb, but I've started to worry myself about possible damage due to heat inside the projector. I've seen no evidence to support this, but just wanted to run it by you guys to see if this is a valid concern. I think the Camry might have similar reflector housings, but not certain. Have any of you seen damage to Toyota projectors by going to an H9? Would the Philips extreme vision be a better choice here due to the potential for damage, or do you think I'm good to go with the H9's?

    Thanks for the input!

  2. #2
    Moderator Alaric Darconville's Avatar
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    Default Re: H11 to H9 Conversion - 2018 Toyota 4Runner



    Quote Originally Posted by KP Texan View Post
    I just took delivery of a 2018 Toyota 4Runner, and one of the first things I decided to do was upgrade the lighting. Perhaps I should've asked these questions before actually doing the conversion, but this may sway whether I keep it this way or not.
    It's right up there with "measure twice, cut once". Not asking first can cost you some time, effort, and money.

    Stock high beams were 9005's in reflectors, so I put some Philips 9011 HIR's in their place after making a minor tab modification to them; this conversion worries me the least since they match the stock wattage, so I think everything should be good to go here.
    Yep, there are no electrical or thermal concerns with that particular upgrade.

    Stock low beams were H11's in projectors, so I modified some Philips H9's to go in their place. This is the conversion that concerns me the most. Based on wire gauge, I think I'm fine with the additional 10W per bulb,
    A voltage drop test is the best indicator of the capacity of the wiring.

    but I've started to worry myself about possible damage due to heat inside the projector. I've seen no evidence to support this, but just wanted to run it by you guys to see if this is a valid concern. I think the Camry might have similar reflector housings, but not certain. Have any of you seen damage to Toyota projectors by going to an H9? Would the Philips extreme vision be a better choice here due to the potential for damage, or do you think I'm good to go with the H9's?
    Heat damage sometimes takes a little more time to reveal itself. I don't have the data on the lamps' ability to handle the extra heat, myself. That voltage drop test might tell you if your wiring isn't up to the task of the extra electrical load, at least.

  3. #3

    Default Re: H11 to H9 Conversion - 2018 Toyota 4Runner

    Alaric's probably right about electrical/thermal issues. The other issue to keep in mind is the amount of light you'll be zapping other drivers with (glare/dazzle). A 4Runner's headlamps are mounted at a pretty high height, and if you throw a load in the back of the vehicle (or tow a trailer) the lamps are going to be aimed upward.

  4. #4
    Moderator Alaric Darconville's Avatar
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    Default Re: H11 to H9 Conversion - 2018 Toyota 4Runner

    Quote Originally Posted by -Virgil- View Post
    A 4Runner's headlamps are mounted at a pretty high height
    The height alone, without tongue weight/loading issues might proscribe the use of the H9. Reaiming them before towing (with everything loaded the way it is) might help, but then you cost yourself distance viewing then you lighten the loading. Also, you're putting your low beams in the rearview mirror of that car in front of you when you're at a stop sign.

    These are issues that normal cars, with their lower headlamp heights, don't face as much. I'd stick with the XTreme Vision H11 for the low beams.

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