How-To mod the 2004/2005 fog lights to turn on with 12 volts - Subaru Impreza WRX STI Forums: IWSTI.com
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Old 06-02-04, 08:05 AM   #1
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Default How-To mod the 2004/2005 fog lights to turn on with 12 volts

How to mod the 2004/2005 fog lights to turn on with 12 volts.

I am not responsible for any damage that can occur with this mod.
Also know that it is illegal to drive with only your fog lights on in most states.

This mod is very simple to do and can be done to any Impreza that has the factory fog lights installed.

Tools needed:
- Long 16/18 gauge wire. (To tap into 12 volt turn on source)
- Heat Shrink Tubing. (To insulate the relay leg)
- Electrical Tape. (To hold everything in place)

What needs to be modded:
- Just the fog light relay next to the fuse box.

How to mod it:
- Unscrew the plastic panel under the dashboard. (Remove the plastic screw by the left door jam / dashboard area and unscrew the two screws on the bottom to take that piece off)
- Once the panel is removed you will see relays on the right of the fuse box.
- The third relay from the bottom is the fog light relay. (This is what you need to unplug and mod)
- Using two flathead screwdrivers on each side, unplug the relay.
- The Top Right leg of the relay is what senses 12 volts and switches the internal switch inside the relay.
- Bend the leg back so it folds over the side of the relay and points towards the opposite direction.
- Place some heat shrink tubing over the 16/18 gauge wire, then insert the wire into the hole in the relay leg and insulate it with the heat shrink.
- Wrap a little electrical tape around the relay to hold the wire in place and to make sure it doesn't get tugged or pulled off. Make sure you don't tape where the relay has notches to slide back in.
- Wire that wire to any 12 volt turn on source and the fogs will go on. I wired it up to the accessory on from the stereo harness.

I noted two things after this mod:
The switch fog lamp on indicator acts like it did before the mod. (It does not light up unless the headlights are on)
The fog lights turn off when the high beams go on. (I think this is to limit the amp draw possibly)

I have a picture that I drew on that should help.

Have fun with your new modded fog lights.



Last edited by LESLIEx317537; 11-01-09 at 07:55 PM.
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Old 06-02-04, 09:50 AM   #2
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Also, I think the other relay leg is just a 12 volt source to power the lights.

You can bend or attach a 12 volt constant power run somehow to one of the 12 volt source relay legs and I think that the fogs will stay on with the highbeams. I think that the system cuts power to the relay when you flash the highbeams. I sorta like the fogs going off with highbeams. -( Makes more of a signal type of thingy, you can flash people in front of you and it is way more noticable)

I just wasn't ready to do that mod at the time. Maybe later. Also modding the relay is cool cause you can buy another one to revert it back to stock easily.

Just be careful, you don't want to fry anything...
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Old 06-03-04, 10:50 AM   #3
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Thanks! That is waaaaaay easier than getting behind the relay and cutting and splicing wires.
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Old 06-03-04, 11:38 AM   #4
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Yeah, I try to always do things the simplest most effective way.

I really should have took pictures of what I did. It can be done in literally 15 minutes. And it is reversible without a trace.
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Old 06-03-04, 07:04 PM   #5
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Quote:
Originally Posted by TreyS
Thanks! That is waaaaaay easier than getting behind the relay and cutting and splicing wires.
keep in mind the relay is about $40.00, if you break the spade off.

ted
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Old 06-03-04, 07:12 PM   #6
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I thought the relay was $25.00 I have the part number is anyone needs.

The spade is pretty hard to break, I was gonna snap it off at first and it wouldn't so I bent it back, hence my mod.
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Old 06-04-04, 05:33 AM   #7
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I did mine in about 15 minutes. Easy mod!!
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Old 06-13-04, 08:51 AM   #8
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Let us know when you complete the second mod mentioned above. We have had several customers inquire about this modification when they purchase the JDM STi Fog Lights. You will make them very happy. Thank you.
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Old 06-13-04, 11:04 PM   #9
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I will probe the spot to find out more info.

I just saw that auto intercooler spray button on your site. Nice.
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Old 06-13-04, 11:17 PM   #10
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You handy with electronics?
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