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.
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.