DIY: OEM JDM HID Headlight Conversion

[enviri]

yes, the jdm factory HIDs are indeed designed to have both run at the same time when high beams are on. My high beams are regulated to flash duty only.

I have repeatedly blown the 10A fuse, and moved to 15A.

If you want both beams on, I'm pretty sure there will be alot of blown fuses, after the wire kung fu that's needed for it to happen...or you wire the hi beam up like it were a fog light.

I love the adjustment range of the HIDs and it can adapt to us roads well...that cut off is indeed there, but in the US where a vast majority of cars on the road are towering SUVs that blind the crap out of us...either they dont notice it, or if they do...SCREW EM.

*the high beams will definitely blind the other side really badly.

[stidnam]

^^ as above, if it's blowing 10a fuses running both beams on factory wiring, that's proof enough to build or buy a proper harness to run these things :) The HIDs alone should be on 15a.

[DeeBee]

Originally Posted by stidnam

I've looked up the EWD for the P90 Yaris and here's a few points to help you out.

As with all wiring jobs, you should be testing everything with a multimeter as opposed to smashing some wires together and hoping for the best.

- Because the high and low beam run off the same positive wire, you only have a 10amp fuse for each headlight. This is probably borderline for just running the HIDs - ideally it'd be 15amp.

If I were you I'd be building a new headlight harness with a few relays that are triggered off the factory wiring and wire these things up properly. Even better if you could get the factory wiring diagram ;) - https://page.auctions.yahoo.co.jp/jp/auction/g212047863


If I had my time again, I'd probably just throw bi-xenon morimoto projectors in my lights. While JDM reflector based HIDs are better than the halogens they replace, they have nothing on a good projector setup. Light output and cut off is just not the same :(

Hi stidnam,

Thank you for your detailed input

I installed 15 amp fuses to replace the 10 amp factory headlight fuses.

I am now looking to build a harness for the headlights to handle the HID power requirement.

I agree with you on the Morimoto projectors. I had a set in my Rav4 and they were amazing!! I wanted the Yaris to look stock and so I ordered these JDM HID headlights to avoid bringing attention to the car while increasing light output.

[DeeBee]

Originally Posted by enviri

yes, the jdm factory HIDs are indeed designed to have both run at the same time when high beams are on. My high beams are regulated to flash duty only.

I have repeatedly blown the 10A fuse, and moved to 15A.

Hi enviri,

Thank you for this confirmation. I had hoped this would be the case on the occasional times I may need to use my high beams.

[stidnam]

Just to clarify, I wasn't advocating to swap the fuses out as that may be a recipe for disaster if the circuits aren't rated for the amperage. I'd be aiming to build a harness with the correct gauge wiring and with a 15a fuse on each low beam and a 10a fuse on each high beam.

For what it's worth, the HID will probably still run on a 10a fuse, but they would have come with 15 from factory. It's the amp draw on start up that will blow the fuse anyway.

[fredovvti]

Guys I found this video, this guy is building a relay to archive that the low beam stay on when trigger the high beam. I will tray this if work on ours jdm headlights.

https://youtu.be/zxJbmIKp2KM

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[DeeBee]

Originally Posted by fredovvti

Guys I found this video, this guy is building a relay to archive that the low beam stay on when trigger the high beam. I will tray this if work on ours jdm headlights.

https://youtu.be/zxJbmIKp2KM

Hi fredovvti,

Thank you for sharing this link. I hope a little re-wiring of my harness gives me this result.

[DeeBee]

Thank you all for guiding me through this install.

I have the lights in the car and that was my Christmas wish of lighting up the road so I can see better! The light output is amazing in comparison to halogens!

What remains is rewriting my harness to keep low beams on when I select high beams.

I really appreciate the advice, guidance, kind words, and valuable information provided by members of this group. I am truly grateful. Thank you one and all.

[DeeBee]

Originally Posted by enviri

yes, the jdm factory HIDs are indeed designed to have both run at the same time when high beams are on.

Hi enviri,

I can confirm that when I select high beams, my low beams turn off

I rewired my harness following the link shared by fredovvti but the result did not change

I think the wiring maybe different up at the switch/fuse terminals

I love the HID output but its frustrating on the country roads here where high beam would be nice to see further out at a depression.

[enviri]

wish i can help you with that lo and high beam problem..i only have 1 theory that may or may not work. (wiring the H7 high beams as a fog light instead).

any other options and im scared there will be shorts or small fires lol.

[DeeBee]

I have tried everything I can think of and I either get ALL lights on throughout or high beams or low beams.

I think I will try use a diode at the low beam and high beam relays to see if I can get it to work. Theoretically it looks possible. I'm not sure what size diode I will need.

If this doesn't fix it I will just live with either low beam or high beam.

[DeeBee]

Finally, I have success!!

The low beam stays on when I select the high beam

I used a 6A 400V rectifier diode between the low and high beam ground wires connected to the low and high beam relays.

So far the result is what I have been looking for

Thank you all for your help along the way!!!

[DeeBee]

BTW, factory headlight fuses are back to 10A since the relays are doing the "heavy lighting" now.

I will test it out for a few days then wrap all the wiring connections in a good loom ro something similar.

[enviri]

nice! How did you attach it?

[fredovvti]

Excelent!!! Pictures please!!!

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[DeeBee]

I know. this sounds dumb... but....How do I post pictures here?

[IllusionX]

Originally Posted by DeeBee

I know. this sounds dumb... but....How do I post pictures here?

Postimages.org


If you are on mobile, use Tapatalk

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[WeeYari]

Originally Posted by DeeBee

I know. this sounds dumb... but....How do I post pictures here?

There is a sticky thread in the Photo subforum. FAQ: How to post pictures

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