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Old 12-03-2013, 11:34 PM   #1
flyboy1100
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Default 2012+ impreza 2.0I independent foglights?

EDIT, Figured out!

- This mod will allow you to run Fog lights independently from the low beams.

- The fog light indicator only will turn on when the low beams are on, this is because of the BIU and I don’t know how to bypass that

- See this post for where to tap into the Deicer Relay coil power to provide power to the foglight relay!!
http://forums.nasioc.com/forums/show...&postcount=158 your fogs will turn off with the ignition switch as this wire is drawing power directly off the ignition relay!!! woot woot!

- I soldered everything because I hate vampire clips, I almost used them out, but was able to get access to everything.


Time required: less than 3 hours, probably can be done in less than 2 but I was testing to make sure this would work.

There is no way to modify the VY wires without cutting 1. The relay side could be done with spade connectors, that's how I tested it, but to me this is permanent and that isn't.

Tools needed:
10mm socket
10mm wrench
Philips
Trim pry bars
Electrical Tape
Wire Ties

EITHER:

Wire cutters
Wire strippers
Solder
Soldering gun
Heat Shrink

OR:
Vampire clips
Butt connectors

Passenger Side:

1. Remove Glove Box
2. Remove Glove Box trim
3. You will be left with this




4. There are 2 clips that hold the relay holder in place, press them and remove it, it just pulls off
5. You will then be left with this


6. Black/Green wire needs to be cut and capped further from the relay. The end that goes to the relay needs to have a different 12v source. Probably want to used something switched on by the ignition. I used the Red/Blue wire which ended up not being switched. See this post for where to tap into the Deicer Relay coil power to provide power to the foglight relay!!
http://forums.nasioc.com/forums/show...&postcount=158 your fogs will turn off with the ignition switch as this wire is drawing power directly off the ignition relay!!! woot woot!




7. all done, put it back together you are done with this side.

Driver’s Side:
Steps 3-7 are optional, you could probably access everything from under the dash and use Vampire clips, but it is less frustrating and easy to get access if you remove the fuse box.

1. Remove the End panel
2. Remove the Panel to the left of the knee air bag
3. Remove the hood release bracket
4. Remove the side fuse box from the main box
5. Remove the 1 bolt and 2 nuts holding the Fuse box
6. Rotate Fuse box out of the way.



7. This is the 2nd plug from the top, this one contains the Violet/Yellow wire that comes directly from the switch. If you put a meter on this and ground the other side and turn the switch on there is no resistance. Anyway



8. I opted to add a few pieces of wire and solder everything. I hate crimp connections and I figured this will be a permanent mod for me anyway. Here is the final result



9. Put everything back together


End Result:

No lights


Fog Lights ONLY, I have yellow overlays on my Outback foglights
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Last edited by flyboy1100; 04-11-2014 at 10:38 PM.
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Old 12-03-2013, 11:54 PM   #2
rossiskier78
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This is something I was hoping had an answer already. I'm use to driving with foglights and just parking lights on.....wish I still could with my '13 Impreza Sport
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Old 12-04-2013, 12:14 AM   #3
G2Spfld
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What about using a DPDT relay between the high beam and low beam circuit. You could mount an activation switch of your choice, this will allow you to swap the high beams for the low beams that the light switch is calling for. This will allow the fogs to be on with highs. You could also utilize a SPST just before it to disable the DRL, in the case you want parking lights and fog combination. I havnt looked at a schematic to actually pinpoint where I'd locate that relay, but I know that's where I'd look at starting if I were to do a project like this.

Last edited by G2Spfld; 12-04-2013 at 12:24 AM.
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Old 12-04-2013, 01:27 AM   #4
Tha Chakal
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This is a priority for me but I wanted to wait until I did the outback fogs upgrade. It's ridiculous that you can't operate then without the low beams on.

I'm in no position to do this myself, so a few weeks ago I found a tuner/state inspection shop with a bunch of WRX's and STI's out front (good omen my book) and asked him about doing this mod. I told him I just want to be able to run the fogs with the parking lights, and he said he'd need to find the schematic for the wiring, but it should be doable.

I'm willing to have this done before upgrading my fogs, just to help you guys out, but it would have to be after the holidays. I'll ask him if he'll do a write up for the DIY crowd too ;-)
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Old 12-04-2013, 02:11 AM   #5
ans2k
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I wonder if you could just do an independent relay in addition to the stock wiring.
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Old 12-04-2013, 06:04 AM   #6
flyboy1100
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Quote:
Originally Posted by G2Spfld View Post
What about using a DPDT relay between the high beam and low beam circuit. You could mount an activation switch of your choice, this will allow you to swap the high beams for the low beams that the light switch is calling for. This will allow the fogs to be on with highs. You could also utilize a SPST just before it to disable the DRL, in the case you want parking lights and fog combination. I havnt looked at a schematic to actually pinpoint where I'd locate that relay, but I know that's where I'd look at starting if I were to do a project like this.
I don't want fogs with highs, that is pointless. I want to be able to turn on the fogs with the low beams off. For situations where normal headlights actually hinder your visibility, like driving in heavy snow

The only reason I mentioned the high beam drl is it is illegal in this state to drive with headlights off, I think that could still meet requirement as would appear your headlights still on

Would it be possible to use the parking light wire to target trigger the foglight relay? That could actually work I think, need to check the diagram

Ansk,
That was another option, then you could turn them on whenever, but without parking lights on you are asking for trouble

I'm going to check the diagram this morning and see if I can change from low beam trigger to parking light

Last edited by flyboy1100; 12-04-2013 at 06:09 AM.
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Old 12-04-2013, 08:44 AM   #7
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Quote:
Originally Posted by flyboy1100 View Post

Ansk,
That was another option, then you could turn them on whenever, but without parking lights on you are asking for trouble
What trouble are you referring to? Are you referring to a dead battery if I for get to turn it off? I was looking at the Hella 500 wiring diagram for ideas. I could tap the parking lights or the accessory outlet. So it would only turn on if the car was on. I figured if I just added it to the existing wiring, I could control them independently or if i leave it off, then I could just use the stock control.
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Old 12-04-2013, 08:58 AM   #8
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Quote:
Originally Posted by ans2k View Post

What trouble are you referring to? Are you referring to a dead battery if I for get to turn it off? I was looking at the Hella 500 wiring diagram for ideas. I could tap the parking lights or the accessory outlet. So it would only turn on if the car was on. I figured if I just added it to the existing wiring, I could control them independently or if i leave it off, then I could just use the stock control.
I was thinking you meant foglights only with no other lights on at all
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Old 12-04-2013, 09:07 AM   #9
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Originally Posted by flyboy1100 View Post
I was thinking you meant foglights only with no other lights on at all
technically, aren't the DRL always on?
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Old 12-04-2013, 09:19 AM   #10
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Quote:
Originally Posted by ans2k View Post
technically, aren't the DRL always on?
No. it's only on when the light is at OFF position. It will be off after you switch to any other light setting. or have the handbrake on.

This guy is able to change the default light setting on a 2012 WRX. Should be the same on the Impreza 12+.

http://forums.nasioc.com/forums/show....php?t=2383843


But the Impreza's OEM fog light is useless. I don't see the point of using it alone. Barely notice it's on, I only turn it on when it's totally dark on the street.
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Old 12-04-2013, 09:32 AM   #11
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Originally Posted by winglik View Post
No. it's only on when the light is at OFF position. It will be off after you switch to any other light setting. or have the handbrake on.

This guy is able to change the default light setting on a 2012 WRX. Should be the same on the Impreza 12+.

http://forums.nasioc.com/forums/show....php?t=2383843


But the Impreza's OEM fog light is useless. I don't see the point of using it alone. Barely notice it's on, I only turn it on when it's totally dark on the street.
LOL, sorry I should have phrased it better. But aren't the lights in the headlight housing always on when driving? I assume yes. Yes, the OEM sucks so hard that they need to work in a Thai massage parlor. But a few of us have converted to the Outback foglights, which uses the H11 bulb that puts out 1350 lumens each or the same bulb as our low beam.
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Old 12-04-2013, 10:17 AM   #12
flyboy1100
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Quote:
Originally Posted by winglik View Post

No. it's only on when the light is at OFF position. It will be off after you switch to any other light setting. or have the handbrake on.

This guy is able to change the default light setting on a 2012 WRX. Should be the same on the Impreza 12+.

http://forums.nasioc.com/forums/show....php?t=2383843

But the Impreza's OEM fog light is useless. I don't see the point of using it alone. Barely notice it's on, I only turn it on when it's totally dark on the street.
Same year, old model, different wiring. Hence this thread

Drl is on when:
Lights off
Parking light setting

But when drl on with light switch off, no other lights are on ie. Parking lights which I want on because I want the front/rear corner lights on for my own safety

Drl is off in all other modes:
Low beams
High beams
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Old 12-04-2013, 10:22 AM   #13
Tha Chakal
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Winglik, here's what the lighting guru says;

http://www.danielsternlighting.com/t...fog_lamps.html

I'm guessing legality is the reason why they wired them to the lows. Freaking nannies...
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Old 12-04-2013, 10:44 AM   #14
flyboy1100
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I looked at the diagram but I can't figure out how the light computer works

I would have this done already Except for that stupid computer
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Old 12-04-2013, 12:03 PM   #15
flyboy1100
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I compared our diagram to the older generation legacy (which I think is similar to the rest)
anyway those look like they were ground switched.

ours looks like the switch goes to the computer, then from there to the relay

I guess we could just bypass the computer? is there any reason that wouldn't work, it appears to be 12v switched
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Old 12-04-2013, 12:18 PM   #16
Tha Chakal
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Your sport has the fog switch on the stalk, correct? Would that make the wiring on mine different, since it's on the dash?
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Old 12-04-2013, 12:25 PM   #17
flyboy1100
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Quote:
Originally Posted by Tha Chakal View Post
Your sport has the fog switch on the stalk, correct? Would that make the wiring on mine different, since it's on the dash?
not sure, I also have that plug albeit unused in my dash.
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Old 12-04-2013, 03:08 PM   #18
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If I had a copy of the diagram, maybe I could give you some ideas. Wouldn't a simple spst relay on the low beam side to lights do it then? Just open the circuit to low beams when you need. Not sure if these cars monitor blown bulbs like my ram does, but I doubt it. If so, DPDT relay with resistor of required specs on open side to truck computer into thinking it has bulbs connected

Last edited by G2Spfld; 12-04-2013 at 04:25 PM.
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Old 12-04-2013, 03:22 PM   #19
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Quote:
Originally Posted by flyboy1100 View Post
...Would it be possible to use the parking light wire to target trigger the foglight relay? That could actually work I think, need to check the diagram
...
I haven't installed my Outback fog lights yet as I wanted to figure out how to do the wiring the first. I was also thinking about wiring it to the parking light.
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Old 12-04-2013, 04:03 PM   #20
jr0bb5
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Subscribed. I would also love to be able to turn on my fogs with just my parking lights on. Have been waiting for someone to figure it out ever since I bought my Impreza. Hopefully someone will be able to figure out a way that doesn't involve a lot of modding or electrical know-how.
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Old 12-04-2013, 04:46 PM   #21
flyboy1100
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Quote:
Originally Posted by G2Spfld View Post
If I had a copy of the diagram, maybe I could give you some ideas. Wouldn't a simple spst relay on the low beam side to lights do it then? Just open the circuit to low beams when you need. Not sure if these cars monitor blown bulbs like my ram does, but I doubt it. If so, DPDT relay with resistor of required specs on open side to truck computer into thinking it has bulbs connected
I will upload when I get home

I understand them just well enough to see what is happening but not too see how to work around
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Old 12-04-2013, 09:53 PM   #22
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Foglights


Headlights





Combination (corner/marker/parking lights)




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Old 12-04-2013, 09:55 PM   #23
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Thanks, give me a few, and I'll send these to my office computer so I can look over them.
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Old 12-04-2013, 10:08 PM   #24
flyboy1100
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could it be as simple as send +12v (from an ignition switched source) to the switch and the GND side send that to the Relay trigger instead of to GND?

or even just the +12v side of the switch, just send that wire to the relay trigger? is that relay triggered off the GND?

like I said, I understand the schematics just enough to not really know how to work around it
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Old 12-04-2013, 10:43 PM   #25
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To be clear, your wanting to be able to replicate lights on dim with fog lights on, just without the actual low beam headlights on, correct? What I would do, 2 SPDT relays, few bucks each at auto parts store. Look at 3 rd pic I believe, H/L-02: F125 refers to LH low beam bulb. F126 refers to RH low beam bulb If we break the circuit between tap 26 on F27 relay and tap 1 on F125-Black wire, and break the circuit between tap 11 on F27 relay and tap 1 on F126- Red wire, we leave everything intact except the actual low beam bulb. Doing this will keep fogs on if selected on stalk, and you can still switch to high beams should you need to flash headlights. The relays will need a switched power tap to activate and a ground. You can share both of these between the relays as you'll want them switched together. I would mount a little micro switch somewhere and once activated, all we are doing is just cutting out low beam bulbs. This gives you parks, blinkers, brakes, fogs, etc like normal. Then should you want to remove the setup all together, its easy and minimally invasive, so it'll be a snap and will not affect anything else. This is my idea, from a quick look at the schematics. There are many ways of doing this, however most others would be too complicated and involved enough that you run a risk of messing up other things. This is a simple circuit break on power to low beams. Since high beams and low beams share common grounds, if we broke that circuit you would lose the ability to switch to high beams quickly should you need. I think that could be a hazard. I'll continue to look over and see if i see any reason this wouldn't work, but I think based on what I see its a very simple

Last edited by G2Spfld; 12-04-2013 at 11:15 PM.
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