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Old 02-13-2010, 09:31 PM   #1
caterpill
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Unhappy 02+/ pre 06? wrx "Fogs with highbeam mod" - need a little help.

I've had the original "foglights with highbeam / parking lights" mod for at least 5 years now, but for some reason I think something is either wrong, or i'm just stupid (probably the latter.)

I did the "fogs with highs" mod about 4-5 years ago... I had regular halogen fogs for about 1.5-2 years after the mod.

SO... the mod entails cutting the red w/green striped wire, and taping it off (4th relay from the top) and splicing the the orange wire to the relay side of the red w/green wire you cut. The other end of the red w/green wire is taped off to prevent shorts.

Now, I installed HID foglights about 2 years ago, and I swore the foglights were working fine with my highbeams.. (ie. did not turn off) but I guess I was mistaken? Recently I noticed that when I flash my highs for whatever reason it may be, my fogs turn off. I wired my fogs with seperate power/grounds and only used the positive wire from the OEM wiring as a trigger (for the relay).. would this be the cause of the mod not working?

Can anyone tell me what exactly the mod does and what I can do to restore full functionality to my foglights? (well in the way i'd like them to be anyway) - Hid's do NOT like to be hot-restarted... I don't want to buy new bulbs every year.

Just a FYI.. I did not do the "full function" mod where you can turn on your foglights without turning on your park lights. The mod I followed allows you to turn on your fogs with park lights, and seperate from your lowbeams. This also allows your fogs to STAY ON when you have highbeams on.

So.. I'm not sure what is exactly done in the mod. For instance.. the orange wire that you splice to the relay (red w/ green wire) is an illumination wire that supplies power to the relay anytime the park lights is on, allowing the fogs to stay on, correct?

Right now, i'm confused because I ensured that the spliced wire has continuity to both ends and my connections are good.. my fogs can be turned on when the park lights are on but when I flash highbeams, they turn off.


Any help would be greatly appreciated.

Thank You.

-Dan
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Old 02-14-2010, 11:02 AM   #2
Big-E
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I will preface this in general by saying that most people when they do the fog-light mod end up butchering their electrical system by unnecessarily cutting wires, bending the prongs on the relay, using jumper wires and so-on. There is a cleaner way to do this.

OP, you were correct in that the red wire with the green stripe is the feed to the coil side of the relay. The fog-light switch completes the ground for the coil on the other side of this circuit (black with white stripe).

On the 2002 to 2004 models, you could either cut this wire or effectively disassemble the relay block to back-out the terminal. On the 2005 and newer models, you could effectively back-out the terminal. Either way, this is the correct circuit to tap into.

The red wire with the green stripe comes off the high-beam relay. This is the ground side to the high-beam relay. This feed wire is split in the harness. One side goes to the relay itself as the hot to the coil trigger and the other side goes to the switch. When the headlights are on, both the low and high beam relays are energized. Thus the feed is able to produce just enough mA of flow to both the relay and switch. This is why when the mod is done that the switch no longer illuminates unless the headlights are on.

Back to the relay itself. What you want to do is install a jumper wire from the red wire with the green stripe that you cut (on the relay block side of course) and tap into the relay coil trigger feed to the ignition relay. This is the first relay at the bottom of the relay block. You want to tap into the green wire.

The green coil trigger feed wire is a switched circuit. When the car is off, this circuit is off. When the car is on, it's hot. Thus by tapping into this circuit to feed your fog-lamp relay, you will be able to use the fog-lights whether or not the parking lights are on and while the high-beams are on.

The fog-light switch on indicator light will, to reiterate, not illuminate unless the head-lights are on. So you have to be mindful of the fact that you can turn the fog-lights on at any time while the car is running even though the switch indicator is not illuminated.

Apparently the orange wire you tapped into is some kind of switched circuit that is affected by the high-beams. Regardless, remove that tap and tap into the ignition relay as stated above.
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Old 02-15-2010, 03:14 AM   #3
caterpill
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Default WEIRd. :d

Big-D: Thank you for your prompt and concise help..

Unfortunately, the auxilary power feed to my high beam circuit was not the problem.. (apparently.)

After some further probing, I found that my foglights work "properly" after I ground the Black/White wire that is the ground for the foglight relay. I checked and double-checked the continuity to the red/green wire and the orange wire that was specified in the original mod for the foglights to work with the highbeams- the power feed to the relay is intact and not shorted/open.

Actually, I do prefer the foglights to remain OFF when my ignition is on but park lights are off. This is in no way objecting to your version of the foglight mod. I did check my wiring connections; actually, splicing the power feed to the fog relay to the ignition switched wire did nothing.. my problem was apparently in the ground circuit.

Which leads me to ask, do you or anyone else know where the "GND-02" location is located?

^ I wanted to make sure that the ground is good. For some reason, when I ground the BLACK w/ white stripe wire as specified in the manual, the foglights work properly; they do not turn off when the high beams are activated. Everything else works as intended. As far as I understand, as long as the foglights do not stay on after the ignition is off, nothing is hard-wired incorrectly.

The service manual for an 02 wrx (couldn't find the 04 wrx manual) states that the fog relay is grounded by the ground point "GND 02" but doesn't state where the ground point is. Honestly, I am drunk, and you aren't supposed to troubleshoot when you're drunk, but I DO NOT see exactly why the ground would go bad all of a sudden without any other lighting problems. Where the heck is GND-02 anyway!?! haha.

$%^&...

Any help is greatly appreciated.

Thanks.

-dan
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Old 02-15-2010, 02:36 PM   #4
Big-E
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GND-02 is the page reference in the manual for the Ground Distribution.

The RH fog lamp ground is listed on this page. It goes to a ground joint connector, circuit connector B198.

The B198 connector is located inside the cabin, passenger's side, under the interior rocker panel and/or at the bottom of the kick panel.

It is a flat 5-pole connector and, according to the manual, is not colored.

But, here are colors they list and if it's not one of these, you've found it:
Black
Blue
Red
Grey
Brown
Yellow
Green

The LH fog light ground is listed on "GND-01" and appears to be what I will call a hard ground. Meaning it looks as if it's grounded right near the lamp or in the engine compartment itself.

The ground for the fog lamp switch runs through a diode, then through the combination switch and then through circuit connector B71. B71 ends up going through circuit connector B198 (see above)
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Old 02-15-2010, 09:56 PM   #5
caterpill
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Ugh.. I messed up. The problem should have been obvious to me, but it wasn't; especially since I don't fully understand how the fog circuit works.

It wasn't the ground wire to the relay, but the LIGHT BULB in the fog light switch. There are two of them-(dunno why the diagram shows three.) one iluminates the fog light button / picture, and the other is an indicator light to tell you the fog lights are on. Now, I noticed that recently my foglight indicator light stopped working even when my headlights are on.

So, as a hunch, I swapped the bulbs. The indicator now works and the backlighting doesn't. However, the fogs do not turn off when I flash my highbeams... all the circles I ran through to try and troubleshoot this problem was pretty much in vain.

Haha.. well even after studying the fog diagram, I can't say why the fogs would turn off when the bulb is not in the circuit. The indicator light in question seems to be in series or parallel with the Red w/green wire and the Black w/ white wire. Then, goes to the diode?

If the light bulb was the sole source of ground for the fog lamp relay, wouldn't the fogs not work at all when the bulb is out? I'm confused.

Anyhow, thanks for the help. Don't drink and troubleshoot. lol.
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Old 02-16-2010, 12:27 PM   #6
Big-E
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I'll put some thought into this myself. I'm curious as to why the fogs stay on when you turn on the high-beams.

I also agree about drinking and diagnosing, so I have a new approach to that: as drinking increases, so does my ability to sit in a chair and continue drinking as well as for conversing with my friends.
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