How to Convert HID Headlights to LED
2004-2009 Toyota Prius
Prius HID headlights look great when they work but they are notorius for going out. In some cases both at once...not safe. Both of the Prii I have owned have had problems. I've replaced many bulbs and several ballasts over the years. I wish I did this conversion years ago, I would have saved myself tons of extra work a good chunk of money. This is so easy and effective that even if these don't last too long you eliminate the ballast altogether. I have about 4 months of use on these now and have had zero issues; instant on.
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Tools Needed:
Parts/Supplies Needed:
- D4R LED headlight kit Note that this kit is not the same one I bought, I can no longer find it. However, this kit looks similar with the spade terminals and no ballast needed.
- Electrical tape
- Duct tape
![](../../images/lighting/led01s.jpg)
1) Remove the headlight assembly steps 1-5 to disconnect the power supply wiring harness from the ballast.
![](../../images/lighting/led04s.jpg)
2) Release these 2 wires and slide out the HID bulb.
![](../../images/lighting/led05s.jpg)
3) Slide the white wiring harness out from the headlight assembly and then screw the ballast back in place.
![](../../images/lighting/led07s.jpg)
4) Tuck the HID headlight bulb connector away as much as possible. I ended up putting a piece of duck tape over mine so it wouldn't rattle around. Some may choose to cut that off altogether since it is no longer needed.
![](../../images/lighting/led08s.jpg)
Here's the LED I ended up with. There's a fan on the back but I've never noticed any noise from it.
![](../../images/lighting/led09s.jpg)
5) Install the LED bulb. Depending on what model bulb you buy it may be a bit different. Mine fit in the D4R base perfect but I needed to rotate it around somewhat so that the LED's pointed out sideways.
![](../../images/lighting/led10s.jpg)
6) Connect the spade terminals to the wire harness from the cover.
![](../../images/lighting/led11s.jpg)
7) I wrapped these with electrical tape.
![](../../images/lighting/led12s.jpg)
8) A little more tape to prevent them from sliding out.
![](../../images/lighting/led13s.jpg)
9) Pack everything up and lock the cover back in place.
![](../../images/lighting/led14s.jpg)
10) Reinstall the headlight assemblies and test your new lights out. Instant on!
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