DIY: OEM JDM HID Headlight Conversion

[IllusionX]

Originally Posted by DeeBee

Thank you for your help. I was able to get the wiring done.
I tested them with a battery charger and they worked well

When I plugged them into the car the HID do not come on
All other lights turn on. I know the bulbs work so it must be something to do with the car's stock wiring. I get the feeling there is not enough power to turn on the HID ballasts. I am not using a wiring harness.

Is everyone who has them working using a wiring harness? Please help me solve this before Christmas. I'd like to have them working for a road trip then.

The Yaris have a ground switch. You may have the wires reversed

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[DeeBee]

Originally Posted by IllusionX

The Yaris have a ground switch. You may have the wires reversed

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Hi IllusionX,

Thanks for your suggestion. I think the wires are ok since I get power to all other bulbs. In fact I tried swapping positions and the high beams came on at the low beam position.

My suspicion is that somehow there is insufficient power to turn on the HID ballast. I know they work because I have tested them with a portable battery charger and they light up well.

I had a Rav4 where the factory wiring powered HID projectors I had retrofitted without a wiring harness. I drove that for 7 years no problem. I expected the same from my little Yaris

[IllusionX]

Originally Posted by DeeBee

Hi IllusionX,

Thanks for your suggestion. I think the wires are ok since I get power to all other bulbs. In fact I tried swapping positions and the high beams came on at the low beam position.

My suspicion is that somehow there is insufficient power to turn on the HID ballast. I know they work because I have tested them with a portable battery charger and they light up well.

I had a Rav4 where the factory wiring powered HID projectors I had retrofitted without a wiring harness. I drove that for 7 years no problem. I expected the same from my little Yaris

Like stidnam said, you may want to use a voltmeter to make sure you get the correct ground and positive. Halogen bulbs don't care about polarity, but polarity is very important with HID.

H4 was designed with a common ground and 2 positive, but the Yaris has a common positive like mentioned above.

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[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.

[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.

[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.