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Old 12-05-2013, 12:31 AM   #26
flyboy1100
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Yes, pretty much everyone who wants to do this wants the ability to have foglights on w/o the low beams. If you have the outback foglights they put out a lot of light but it is worthless in snow/fog/etc because your low beams are reflecting off the obscuration.

I don't care how it is done, but I don't really want an extra switch involved, even if it is slightly more complicated, I want to use the factory controls, but I do understand what you are saying to kill the power to the low beams. Unless I could use the oem add on foglight switch, then it would look factory.
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Old 12-05-2013, 12:35 AM   #27
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We can make the oem fog light switch work perfectly. Just flip it on when u want low beams off. I want this as well, for your reasons and to drive with park lights only on. Can't really drive thru Christmas lights with drl on. Have to use Tahoe where I have ability to switch all off with 1 turn of switch from factory.

Just need to run the switched power from fog light switch to both relays to open the circuits on low beam power.
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Old 12-05-2013, 06:49 AM   #28
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Originally Posted by G2Spfld View Post
We can make the oem fog light switch work perfectly. Just flip it on when u want low beams off. I want this as well, for your reasons and to drive with park lights only on. Can't really drive thru Christmas lights with drl on. Have to use Tahoe where I have ability to switch all off with 1 turn of switch from factory.

Just need to run the switched power from fog light switch to both relays to open the circuits on low beam power.

But there are times I do drive with both lows and fogs on and making the factory switch disable the lows kills that ability. My yellow fogs are good for black ice detection.

Can you tell from the diagram if it is a ground or +12v being sent to what i assume is the trigger on the relay? Because if we can just activate the relay then we can get the fogs on whenever we want.
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Old 12-05-2013, 08:29 AM   #29
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You will be able to drive with lows and fogs on. I thought you meant adding a factory fog light on dash that's not currently being used now. My fogs are on stalk, so adding another factory style switch would be controlled independently. Unless I'm misunderstanding you. The factory relays control a little differently than what we would add. I'm not sure how to tell you to retain current features and what your asking, without adding an external catalyst of some sort. If you have a dead spot where fog light switch could go on dash, I would do that and still look factory. Otherwise add a foot switch under dash or something. Like I mentioned before, if we start messing with anything more complicated than that, well I'm not familiar enough with the robustness of Subaru electronics to know how susceptible it is to err after manipulation. You can keep it simple and effective, with factory appearance. A harness could be made to plug in directly after MB-16-M/B fuse 6 to cut activation feed (gray wire) to relay for low beams. That would prob work ok. Kill power to F27, tap 26/11 that feed low beam bulbs. This would drop us down to a single SPDT relay. Could run harness to extra panel by dash illum dial, and just run a factory fog light switch there. Would be poss to make it look almost totally factory.
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Old 12-05-2013, 12:40 PM   #30
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Good to read we're getting some progress made! Thanks a bunch guys for your efforts! Wish I was able to contribute, but I know nothing when it comes to this electrical stuff.

So, if I'm reading this right, we should be able to add a factory dash fog switch to activate the fog lights while the parking lights are on? Also, would this option be only for us who already have the fog light switch on the stalk?

Last edited by jr0bb5; 12-05-2013 at 12:49 PM.
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Old 12-05-2013, 12:47 PM   #31
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Originally Posted by jr0bb5 View Post
Good to read we're getting some progress made! Thanks a bunch guys for your efforts! Wish I was able to contribute, but I know nothing when it comes to this electrical stuff.

So, if I'm reading this right, we should be able to add a factory dash fog switch to activate the fog lights the parking lights are on? With this option be only for us that has the fog light switch on the stalk?
Yes I believe so. It isn't a bad option either. The plug for that switch is there on all models so in our case where we would be adding the extra switch all we would have to do is cut off the connector I would think?
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Old 12-05-2013, 12:49 PM   #32
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Originally Posted by G2Spfld View Post
You will be able to drive with lows and fogs on. I thought you meant adding a factory fog light on dash that's not currently being used now. My fogs are on stalk, so adding another factory style switch would be controlled independently. Unless I'm misunderstanding you. The factory relays control a little differently than what we would add. I'm not sure how to tell you to retain current features and what your asking, without adding an external catalyst of some sort. If you have a dead spot where fog light switch could go on dash, I would do that and still look factory. Otherwise add a foot switch under dash or something. Like I mentioned before, if we start messing with anything more complicated than that, well I'm not familiar enough with the robustness of Subaru electronics to know how susceptible it is to err after manipulation. You can keep it simple and effective, with factory appearance. A harness could be made to plug in directly after MB-16-M/B fuse 6 to cut activation feed (gray wire) to relay for low beams. That would prob work ok. Kill power to F27, tap 26/11 that feed low beam bulbs. This would drop us down to a single SPDT relay. Could run harness to extra panel by dash illum dial, and just run a factory fog light switch there. Would be poss to make it look almost totally factory.
Any Chance you can sketch out exactly what you mean in paint or something similar, I'm a visual person when it comes to this stuff.

Adding an extra switch would be ok with me, too bad we just missed the 20% sale!
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Old 12-05-2013, 12:52 PM   #33
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Yes I believe so. It isn't a bad option either. The plug for that switch is there on all models so in our case where we would be adding the extra switch all we would have to do is cut off the connector I would think?
Good, good! So who is going to be the guinea pig to see if this actually works before I go ahead and order some parts?
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Old 12-05-2013, 12:53 PM   #34
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I'll work on that this weekend. I want to follow it all out on one of the cars this weekend and check accessibility to that location, and probably layout a harness that can be pre-cut to make it a quick install. I can't really imagine why this wasn't a factory feature, but guess nothing's perfect.
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Old 12-05-2013, 01:38 PM   #35
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this the OEM add on switch, price is kinda spendy
http://estore.subarupartswarehouse.c...7823&makeid=32
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Old 12-05-2013, 01:40 PM   #36
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Originally Posted by G2Spfld View Post
I'll work on that this weekend. I want to follow it all out on one of the cars this weekend and check accessibility to that location, and probably layout a harness that can be pre-cut to make it a quick install. I can't really imagine why this wasn't a factory feature, but guess nothing's perfect.
although adding another switch, couldn't you just run that straight to a relay and then to the fog harness? or would that be more complicated, or cause problems?

i would rather not tear into the harness under the column if it could be prevented
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Old 12-05-2013, 01:53 PM   #37
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I wanna look at it on the car further. Schematics are like theory, and sometimes reality yields different results. It could possibly be easier than thought. I would prefer a simple plug n play solution so we wouldn't be snipping wiring.

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Old 12-05-2013, 03:08 PM   #38
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Excuse my ignorance, but shouldn't what we are trying to accomplish be solved by finding the wire for the fogs that is attached to the low beams (that denies the fogs power unless the lows are on), then either splicing or removing said wire, and re-attaching it to the parking lights?
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Old 12-05-2013, 03:36 PM   #39
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Excuse my ignorance, but shouldn't what we are trying to accomplish be solved by finding the wire for the fogs that is attached to the low beams (that denies the fogs power unless the lows are on), then either splicing or removing said wire, and re-attaching it to the parking lights?
BIU controls what has power and when. Better off, if you want to go that route, to alter the headlight switch itself so the BIU doesn't know the low beams are even on. Then bypass it and power beams. But, several invasive steps there, none of which I'll do. To me, a simple step of disabling power after BIU to low beam relay will solve the whole issue. Then control that relay via harness that's already wired for a dash fog light switch. This will not give you fogs on high beams but it'll kill low beams and keep fogs and everything else on. It'll also let you keep DRL on. Unless I'm missing something, my DRL seems to be on with parking lights if I'm driving. So adding fogs to parks also mean disabling DRL. Easy enough to do, but some areas require DRL on vehicles after a certain build year. So, back to leaving everything as is, less killing low beam bulbs when desired.
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Old 12-05-2013, 04:03 PM   #40
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BIU controls what has power and when. Better off, if you want to go that route, to alter the headlight switch itself so the BIU doesn't know the low beams are even on. Then bypass it and power beams. But, several invasive steps there, none of which I'll do. To me, a simple step of disabling power after BIU to low beam relay will solve the whole issue. Then control that relay via harness that's already wired for a dash fog light switch. This will not give you fogs on high beams but it'll kill low beams and keep fogs and everything else on. It'll also let you keep DRL on. Unless I'm missing something, my DRL seems to be on with parking lights if I'm driving. So adding fogs to parks also mean disabling DRL. Easy enough to do, but some areas require DRL on vehicles after a certain build year. So, back to leaving everything as is, less killing low beam bulbs when desired.
I'm a little confused now. So, the way you're describing would cut power to the low beams? Does this mean that we would need turn on the low beams and fogs on the stalk switch and then activate the new dash switch to turn off the low beams when desired?
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Old 12-05-2013, 04:09 PM   #41
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I'm a little confused now. So, the way you're describing would cut power to the low beams? Does this mean that we would need turn on the low beams and fogs on the stalk switch and then activate the new dash switch just to turn off the low beams?
Yes- I think flyboy wanted it like the low beam with fogs on so everything worked. He just wanted everything except low beam lights. Is this not correct? I leave my fog switch on, so I never mess with that. You turn your lights on at night to drive anyway, so that's not an issue. If we used a factory fog switch to disable low beams, all you do is push that 1 switch to disable low beams. Everything else is on like you would want. You even still have high beams at the flip of the stalk. That seems to me to be the fastest and easiest way. Unless I'm missing something here, and I'm still not really understanding what the desired outcome needs to be.
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Old 12-05-2013, 04:25 PM   #42
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Yes- I think flyboy wanted it like the low beam with fogs on so everything worked. He just wanted everything except low beam lights. Is this not correct? I leave my fog switch on, so I never mess with that. You turn your lights on at night to drive anyway, so that's not an issue. If we used a factory fog switch to disable low beams, all you do is push that 1 switch to disable low beams. Everything else is on like you would want. You even still have high beams at the flip of the stalk. That seems to me to be the fastest and easiest way. Unless I'm missing something here, and I'm still not really understanding what the desired outcome needs to be.
Ok, thanks for the clarification. That wasn't the way I was envisioning it, but I suppose that way would work just fine.

The way I was thinking was that you activate the new dash switch in order to turn on the fogs while the stalk switch was turned to the parking light position.

Like I said, I don't know much about how this stuff works so the way I was thinking might not be feasible or be way too much work.
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Old 12-05-2013, 04:32 PM   #43
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Ok, thanks for the clarification. That wasn't the way I was envisioning it, but I suppose that way would work just fine. The way I was thinking was that you activate the new dash switch in order to turn on the fogs while the stalk switch was turned to the parking light position. Like I said, I don't know much about how this stuff works so the way I was thinking might not be feasible or be way too much work.
We can do that, it'll be a little more complicated as there will be two switches controlling fogs. With that said, let me look it over again. A DPDT relay would allow us to move fogs to a new circuit. If we can connect that relay, and new circuit to the existing dash fog switch wires ( for those without stalk control) then that might be just as easy.
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Old 12-05-2013, 05:36 PM   #44
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Yes- I think flyboy wanted it like the low beam with fogs on so everything worked. He just wanted everything except low beam lights. Is this not correct? I leave my fog switch on, so I never mess with that. You turn your lights on at night to drive anyway, so that's not an issue. If we used a factory fog switch to disable low beams, all you do is push that 1 switch to disable low beams. Everything else is on like you would want. You even still have high beams at the flip of the stalk. That seems to me to be the fastest and easiest way. Unless I'm missing something here, and I'm still not really understanding what the desired outcome needs to be.
I want to be able to set the lights to parking lights, then turn on fog lights.
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Old 12-05-2013, 08:20 PM   #45
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I want to be able to set the lights to parking lights, then turn on fog lights.
So your thinking the same way that I am then.
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Old 12-05-2013, 08:59 PM   #46
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So your thinking the same way that I am then.
Yes. I'm wondering if we can just bypass the biu and run the current switch to the relay. Everything is in the same location behind the glove box. You would lose that indicator, but my lights are yellow it is difficult not to notice they are on. Plus I actively turn them on when needed and off when they are no longer needed.

I plan to look this weekend perhaps
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Old 12-05-2013, 09:59 PM   #47
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This is the only thing I found when I searched for info about this mod a while back. Yes I know this is for a different car, but it made me hopeful that it would be a similar process for our rides;

http://m.scionlife.com/forums/showth...0083&styleid=5
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Old 12-05-2013, 10:49 PM   #48
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I figured out how to hook fogs to parks, but it'll bypass the fog switch. I'd like to keep the fog switch active as well. Would you have access to the pinout voltages on the BIU? I'm not sure if that info is avail but if I had that I could easily solve this issue. There are several ways to do this, however each one has a draw back I don't like. If I knew for sure what's coming out of BIU it'll be easy. The schematics shows connections, however I rather not guess as to what's going on with each tap. My thought is hook the tap 16 (blk wire) from light switch for parks going to B17 on BIU to tap 4 (violet with yellow tracer) going to B26 on BIU that activates fogs so the park switch triggers both B17 and B26 to activate fogs with parks. Then use the existing fog switch to open that circuit so you can kill the fogs by turning it off. My hang up is turning fogs on by themselves should you want to. I can do that, if I knew more about the BIU.
The other thing is I can bypass the BIU all together and wire directly to fog relay. I am not sure how that'll affect the BIU though if at all. It may throw code or wig something else out. I know on a GM vehicle, its BIU ( called a bcm) wigs out easily. I just installed a new Rockies passlock security bypass module on a Monte Carlo SS for my brother because any little thing freaked its security out and killed the ignition. I don't want to put an idea up and have half NASOC pissed at me cause their cars are wiggling out. Hell, half are already pissed enough without any alterations. Lol
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Old 12-05-2013, 11:34 PM   #49
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I figured out how to hook fogs to parks, but it'll bypass the fog switch. I'd like to keep the fog switch active as well. Would you have access to the pinout voltages on the BIU? I'm not sure if that info is avail but if I had that I could easily solve this issue. There are several ways to do this, however each one has a draw back I don't like. If I knew for sure what's coming out of BIU it'll be easy. The schematics shows connections, however I rather not guess as to what's going on with each tap. My thought is hook the tap 16 (blk wire) from light switch for parks going to B17 on BIU to tap 4 (violet with yellow tracer) going to B26 on BIU that activates fogs so the park switch triggers both B17 and B26 to activate fogs with parks. Then use the existing fog switch to open that circuit so you can kill the fogs by turning it off. My hang up is turning fogs on by themselves should you want to. I can do that, if I knew more about the BIU.
The other thing is I can bypass the BIU all together and wire directly to fog relay. I am not sure how that'll affect the BIU though if at all. It may throw code or wig something else out. I know on a GM vehicle, its BIU ( called a bcm) wigs out easily. I just installed a new Rockies passlock security bypass module on a Monte Carlo SS for my brother because any little thing freaked its security out and killed the ignition. I don't want to put an idea up and have half NASOC pissed at me cause their cars are wiggling out. Hell, half are already pissed enough without any alterations. Lol
i cut off the bottom of each diagram, but it only showed what the connectors are and colors, not incredibly helpful. no voltages at all. I'm guessing have to get in there with a meter, which if i get time on monday I will do myself.

i know on the older models they were also bypassing the BIU, but not sure exactly how much integrated ours is.

still need a picture to completely visualize what you mean.

how about this post, would this work?

http://forums.nasioc.com/forums/show...2&postcount=50

i never saw that post before, it might actually work and be much easier than everything else discussed! if I am understanding it correctly, my initial though was correct and the switch is only controlling the ground input, so we can just bypass the BIU completely and run that to the relay VY wire, and then tap into a 12v source for the power? then the fogs will work whenever the switch is turned on. so maybe it is much more similar to the older gen Impreza than originally thought?

Last edited by flyboy1100; 12-05-2013 at 11:43 PM.
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Old 12-05-2013, 11:41 PM   #50
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Yes, looks like it'll work. That's switching ground via fog light switch to the relay, bypassing the BIU it looks like. That's like what I had in mind, I just wanted to verify the BIU data first.
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