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Old 10-19-2003, 01:19 AM   #1
GravelRash
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Member#: 16318
Join Date: Mar 2002
Chapter/Region: NWIC
Location: Kirkland, WA
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2002 WRX wagon
Grime over Sedona Red

Default Fog light mod (full function)

Preface: most of this has been posted in other threads here and/or on ScoobyMods before, but I've not seen it all layed out like this. So for those who haven't gotten around to it yet, or who did the quickie solution and would like the switch to light up properly too...

(This will be in pieces due to post size limitations...)

History/rationale:
I have no idea why Subaru wired the fog lights to go off when you hit high beam…unless it’s purely legacy wiring from the previous version. (Some states do – or used to – limit you to 4 “headlights” lit at one time on the front of the car, including separate hi and lo beams, fogs, driving lights, whatever. But the ’02 Impreza has only 2 headlight bulbs to start with…)

Not only did I want more light out there, but it appeared to be very confusing to oncoming drivers when I’d turn off the hi beams – and suddenly have 2 more lights come on. Got flashed enough times to be annoying.

So...
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Old 10-19-2003, 01:20 AM   #2
GravelRash
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Grime over Sedona Red

Default The whole story...

So I figured out how to rewire everything to my liking:
• Fogs now come on anytime the “parking” light position on the lighting stalk full lighting is selected – with the ignition on (as normal); this allows fog light only use, i.e., w/o low beams, in really nasty fog/snow, so only the low, flat, fog beam is out there. (Plus, of course, whatever – hopefully minor – glare you get off the little parking lights; haven’t tested that yet.)
• Fogs now stay on when hi beams are on
• Fogs do not come on when the standalone “Park” switch on top of the steering column cover is turned on
• Fog switch illumination light, and on/off indicator light, work “normally”, i.e., switch illuminated like always, and on/off indicator correctly reflects fog status
• No new switches, relays, or any visible signs; just various wiring bits snipped and/or added

The only anomaly is that if I leave the fogs on they flash as part of the remote lock/unlock indication. I can live with that

• Fog light switch:
1. I took off the lower dash panel to do this; you can probably (on the WRX) remove the coin tray and reach in there, or up behind the dash if necessary, and disconnect both the fog and cruise switch connectors, and lead them out through the coin tray hole to work on the fog switch. Worth a try at least…
Unwrap the tape near the switch to give some working room.
2. Cut the (~20GA) Yellow with Green wire near the switch; cap the harness end (electrical tape, small wire nut, shrink tube…)
3. Splice (I used connectors, in case I made a mistake at this point) a line onto the YG at the switch, and take it to ground. (I had a ground lug available that fit perfectly under the head of the lowest throttle mounting plate bolt)
4. Cut the (~18GA) Red with Green wire near the switch; cap the harness side
5. Splice a wire onto the switch side of the RG wire; leave enough wire to follow the harness path back around the fuse block and over to the back side of the relay box next to it. I used 18GA ‘cause it’s what I had handy, but it doesn’t need to be that big – you’re only powering the off/on indicator light with this lead; the original lead is that size because it originates at the hi beam relay, and feeds several circuits.

• Parking light switch:
1. Remove the lower steering column cover; one screw, lower left, then gently pop the several clips on both sides
2. Below the lighting stalk there is a white switch body, with 2 connectors plugged into the bottom; leave the larger, outer connector in place, and unplug the smaller inner connector; this one has only 3 (4?) wires – one of which is Black with Red (~20GA)
3. Again, you’ll probably need to unwrap tape near the switch to free the BR wire enough to work on. Splice into the BR wire; I used the 3M type clip-on splice-with-connector. Note that this wire is the new power lead – but it’s only powering the fog switch indicator light and the fog relay coil; no big loads.
4. Plug the switch connector back in, and route the spliced wire around the right side of the steering column, following the wire harness back beneath the dash; I used several tie wraps to do this; there’re a number of sharp edges to avoid in the area.

• Fog light relay:
1. You’ll have to be upside down under the dash for this part…
2. On the back side of the relay block (vertical black block, right next to the back of the fuse block, on the left looking at it from behind the dash), locate the wires coming from the 3rd relay from the bottom (above the fuse block at the bottom of the relay block). Fortunately the Red with Green wire you need is right at the left edge of block.
3. Cut the RG wire; leave enough on the harness side, before it disappears into the wrapped bundle, to cap this side; you should have about 2” of free RG wire coming off the back of the relay now.
4. Route the 2 new wires you spliced, from the Parking light switch and the Fog switch (the RG splice, not the YG splice to ground!) over to meet the RG stub from the relay and connect all 3. The trickiest part of this is stripping the end of the lead from the relay; not very long, and not much room to work. Neither of my strippers could get up in there; used needle nose to hold and rotate the wire, and a small util knife to cut the insulation. (Be careful if you’re not wearing glasses; very easy to cut a strand or two of wire…which can fall in you face when removing the insulation. Not to mention the knife above your face, in a very awkward position .

I can supply circuit details, connector #s, etc., if needed. Theoretically you could tap the other end of the BR wire, which is at a connector on the back of the fuse block – right next to the relay block. But good luck getting to it! I wasted way too much time before giving in and routing from the steering column end…
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Old 10-19-2003, 08:19 PM   #3
quynce
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Default

Thanks for the write-up.
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Old 10-20-2003, 12:19 AM   #4
Boost Boy
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Yes indeed good write up and just FYI "(Some states do – or used to – limit you to 4 “headlights” lit at one time on the front of the car, including separate hi and lo beams, fogs, driving lights, whatever. But the ’02 Impreza has only 2 headlight bulbs to start with…)"
This is actually done on most cars unfortunately but it does not refer to having 4 "headlights" lit it refers to 4 filaments lit, and the rational behind it is that when the low beams are on the fogs can be on cause the low beam is only 1 filament so low + fogs = 2 filaments and with high beams on thats low + high = 2 filaments so if you added fogs thats 3 filaments which is considered illegal in some states. Anyway sorry for the LONG explanation but there you have it
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Old 10-20-2003, 10:58 AM   #5
Murray
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actually its just because most state laws say you cant have high beams and fog lights lit.. only low beams and fogs..OR, you can have high beams and Aux. driving lights..(something like a Hella 500).
fog lights can be white or "yellow", but must project a low wide beam..
Aux. driving lights can only be white and project a long driving type beam pattern, and can only be on with high beams.

fog lights must go off when you flash your high beams, aux. driving lights may come on when you flash your highs.

lights mounted to a light bar..they are allowed to be on if they are wired as a fog or aux. driving light, but must ONLY be on with the correct headlight(fog with low, driving with High)
if the lights are mounted above the windshield, they must be covered at all times, and are never allowed to be on for street use(like on a off-road truck)
this is what most states agree on.

Subaru made the fogs the way they are becuase they were designed to be a "fog" light..not projecting a long beam.

that is a good writeup though, and im sure no one will bitch about you having your fogs on whenever you want them to be.

my car didnt come with fog lights at all..i have no factory wiring other than from where the switch would be to where the relay is supposed to be..none in the lower front bumper area.
when i added fog lights to my car, i used aftermarket wiring, a very nice idea because i am soon to be using 85watt bulbs.
now that i have an RS bumper and fog lights, i wired them into my existing aftermerket wiring, and as soon as i get a factory fog light switch, i will wire them into that and have it lit at night and look 100% factory, but with higher capacity wiring. i believe 14 or 12 awg wiring is the best idea for higher wattage bulbs..at least up to 85 watts.
(yes my fog lights draw directly from the battery, they are operated by a relay, just like stock, but doesnt appear stock under the hood.)
i will be making a writeup for those who want to use their fog lights to their fullest..with high wattage bulbs drawing from decent wiring. but thats not for a few weeks yet.
Murray
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Old 10-20-2003, 05:23 PM   #6
GravelRash
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Join Date: Mar 2002
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2002 WRX wagon
Grime over Sedona Red

Default

Quote:
Originally posted by Boost Boy
Yes indeed good write up and just FYI "(Some states do – or used to – limit you to 4 “headlights” lit at one time on the front of the car, including separate hi and lo beams, fogs, driving lights, whatever. But the ’02 Impreza has only 2 headlight bulbs to start with…)"
This is actually done on most cars unfortunately but it does not refer to having 4 "headlights" lit it refers to 4 filaments lit, and the rational behind it is that when the low beams are on the fogs can be on cause the low beam is only 1 filament so low + fogs = 2 filaments and with high beams on thats low + high = 2 filaments so if you added fogs thats 3 filaments which is considered illegal in some states. Anyway sorry for the LONG explanation but there you have it
Hmmm...never heard the "filament" requirement before, but in single bulb headlights like 02/03 Impreza it still doesn't apply: there is no configuration where both filaments are lit at the same time: when you switch on Hi beam the Lo filament is switched off. (This can be confirmed by looking at the wiring schematics.)

The WA RCWs don't refer to filaments, but to "lamps", and specifically refer to "multi-beam" headlamps, considering them as a unit - and distinct from "spot" or "auxilliary" lamps, of which only 2 may be in use at any time.
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Old 10-20-2003, 11:24 PM   #7
glepko
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For what it's worth, fog lights should not be used with high beams, especially the weak, poor patterened US spec high beams. The reason is that the bright fog lights focused onto the pavement directly in front of the car decrease the ability of your eyes to focus into the distance, where high beams are supposed to shine. What you lose, if I'm not mistaken, is the peripheral vision at mid to long distance. You don't really need to see what's close to the car at the speed that high beam lighting is 'normally' used, things that fall into that beam are too close for safe reactions. With a nice E-code headlamp the problem is lessened, but still not enough for optimal vision/optimal safety. Nice work figuring out the wiring non-the-less.
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Old 10-21-2003, 12:15 AM   #8
GravelRash
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Join Date: Mar 2002
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2002 WRX wagon
Grime over Sedona Red

Default

Actually I find that running the fogs w/ the Hi beams is a great advantage, especially on wooded highways.

I'm always scanning the near/mid zone for signs of deer or other wildlife. With the Subie's weak close coverage from the Hi beams I had to concentrate more on the close/mid zone than the long zone.

Add the fogs, and voila! Now there's enough light close in that I can let my peripheral vision do a lot of the work and focus farther out in the actual Hi beam zone.

Ymmv, but it works big time for me.
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Old 10-21-2003, 05:31 PM   #9
O2-GGA
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Quote:
Originally posted by Murray
actually its just because most state laws say you cant have high beams and fog lights lit.. only low beams and fogs..OR, you can have high beams and Aux. driving lights..(something like a Hella 500).
fog lights can be white or "yellow", but must project a low wide beam..
Aux. driving lights can only be white and project a long driving type beam pattern, and can only be on with high beams.

fog lights must go off when you flash your high beams, aux. driving lights may come on when you flash your highs.

lights mounted to a light bar..they are allowed to be on if they are wired as a fog or aux. driving light, but must ONLY be on with the correct headlight(fog with low, driving with High)

I was thinking about making a custom light bar and adding fog lamps to it, so I could also add Aux driving lights if they are on with high beams. I don't know if anyone has done a light bar like that
ie.. Having the Aux lights on top and the fogs "upsidedown" on the bar
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Old 09-04-2007, 03:45 PM   #10
WRBLueGD2
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I'm going to bring back this old ass thread...

By chance is this the same for my '04? I just disabled my DRL and would like to fully control my fog lights (Not have them only on with low beams and kick off with hi beams) Any diagram or write up for an '04 WRX?

Thanks in advance.
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Old 09-04-2007, 04:09 PM   #11
Noah
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03 SV650S

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I've done this on my 05. My fog lights work when the parking lights are on, and they stay on when my high beams are on. Exact same process. I did fail my Virginia state inspection though because the fogs stay on with the high beams. Its not that hard of a mod to reverse though.
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Old 09-04-2007, 04:50 PM   #12
WRBLueGD2
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This one just seems a bit tough to follow. Any pictures would be great. But I may just wing it and take pics myself for others like me. Only on a day off though. Seems like it may be a couple hour job...
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Old 09-04-2007, 05:09 PM   #13
Noah
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This is kind of a two part mod. This part is to get your fogs to run independently.

http://www.scoobymods.com/forums/sho...&threadid=1022

This is to disable your DRL without unplugging the module. This keeps the DRLs running until your parking lights are flipped on.

http://www.scoobymods.com/forums/showthread.php?t=2353

Enjoy!

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Old 09-13-2007, 01:03 PM   #14
pastafasool
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This worked perfectly for an 07 2.5i wagon. Thank you very much. My fogs don't even blink when hitting the alarm ! Having already done the DRL mod, I am now in total control of my lights. I am master of my Domain. (I did add an on off switch to the DRL's by running the cut wires from the conector behind the glovebox, over to a blank switch to the left of steering) thanks again.
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Old 09-13-2007, 01:44 PM   #15
Bluefoton
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now with a HID retrofit

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So the combination of aux. and high beam with no fogs is legal on freeways? Lots of late driving awaits me in fall, and I'd like to have the aux. lights as long as noone comes in the opposite direction... but without getting stopped by a hidden patrol car..
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Old 09-13-2007, 02:35 PM   #16
10-56
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Thumbs down



In all my lurking on Nasioc this is the most stupid thing I've seen.

Why don't you think they put DRL on cars now? Why do people always have that reaction?

"My car is doing something automatically and I don't like not being in control of my car" WTF?

DRL is a safety measure so that other people can see you better at any time. Fog lights and Hi beam together actually put your focus closer to the front of the car, which is the opposite purpose of the Hi beam.

Do you want to put a manual switch on your airbag too? In case you don't want it to deploy in an accident and be in total control of the car.
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Old 09-13-2007, 03:40 PM   #17
pastafasool
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WHOAA !! Maybe I'll just put a switch on Your air-bag. (just kidding...)
I just wanted fog lights only for blinding snow storms we get a few times a year here in Western New York. The DRL switch is only so that I can do just that. I've ridden motorcycles a long time, I know how valuable DRL's are.
I just wanted to drive more safely in Big snow.
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Old 03-29-2008, 02:03 PM   #18
dtc9
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This Thread might be dead but...I have a question that I don't think has been answered here. First, my 05' 2.5RS doesn't have the factory fog relay or cabin switch. I to wanted to be able to engage the fogs independently of whether I was using low, high beams or no beams. So with the wiring kit that came with my Hella 500's, how do I do this? It seems that connecting the aux lamp relay power lead (blue wire) to the low beam lead power (as suggested by Hella) is the problem. I have zero electrical experience but it seems like a straight forward concept. What am I missing here? Thanks for any advice...
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Old 01-12-2010, 09:15 PM   #19
02blubru
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Is this for the wrx or the legacy??
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