I read up on scoobymods about it and this part seems unclear to me:

QUOTE-
"What I've done was to splice another wire into the middle of it, and connect the other end of that to the Black wire on the Cruise Control plug - I've found that black wire to be a constant ground so that will work fine. If you don't want to mess with that, you can find another ground, either wire or on the body, to tap into. I've just found that running the wire runs up that loom well to the black wire."

Link, http://www.scoobymods.com/forums/showthread.php?t=62


So, is he saying splice one of the wires on the foglight button into the yellow/blue one?
Then take the wire you spliced into it and connect it to the black cruise control wire?
Doesn't seem like it would work, i dunno anyone else who's done this can tell me how it went?

Thanks,
-Jeff

 

One other thing, there are 2 yellow/blue wires on the foglight switch. How am I supposed to know which one to use?

 

OK, thanks for reminding me ... I was going to get around to doing this, too...

Here's the relevant page from the wiring diagram (I added a few notes and things based on what I *think* is there ... no guarantees!)



Note that this is from the '00 Impreza service manual.

So, it seems that simply cutting PIN 5's yellow/blue wire and shorting it to ground would work. Personally, I would *not* try to plug that into the cruise control wire -- sure, in theory it works, but if something goes wrong you now have two systems to debug instead of one ... I would just make a ground lug and attach that to the PIN 5 yellow/blue ... that should be a little more reliable than vampire clips anyway.

Note that there are two yellow/blue wires coming out of the back of that fog light switch, according to the diagram. Make sure you get the one on PIN 5, not PIN 2 (check the diagram)!

 

Okay I took everything apart and located PIN 5, so I just cut that wire off from the fog switch and ground it to a metal part of the body, correct?

 

Yup :: crosses fingers ::

If you wanna be absolutely sure you can just take a multimeter and make sure that PIN 5 is connected to ground with the low beam switch on and NOT connected to ground with the high beam switch. You don't even have to have the car turned on to do this.

 

Dammit, heres what happened:

I cut PIN 5 out and grounded it > killed my foglights competely so I reconnected now they work
Then I tried the other yellow/blue wire and nothing happened
The I tried PIN 4 grounding, and it made one of my fuses pop, but I didnt see which one!

Now my right headlight is really dim and my dashboard doesnt light up anymore!!
I knew this wasnt going to work, I should of just left it how it was.

 

Aiyaiyaiyaiyai!!! OMG, dude, you can't just go grounding random wires all over the place! LOL ... check the illumination / tail fuse, that should be the culprit...

Are you sure you got PIN 5 on the connector? I think the diagram is for the connector side, but when you look at it from the back, it's the mirror-image. So use the other yellow/blue wire (PIN 2) as a reference and find the one that's kitty-corner to it...

Does PIN 5 short to ground when you have the headlight switch connected?

 

Whoops, forgot to replace a some fuses back...hold on, try this again.

 

Okay, got everything back in place.... fogs work, headlights work but my dash wont light up now.


I had tried grounding PIN 2 also but it still killed my fogs with the highbeams on, now I just need to find out what fuse to replace for my dash lights.

 

Yep, pulled out the illumination fuse and its the one alright... gotta replace it now.

 

Alright, I replaced the illumination fuse and everything works just fine now. Only thing is I didn't accomplish anything!!! I tried grounding yellow/blue wires PIN 5 and PIN 2 and neither one let me run highbeams with the fogs on.. what gives??

 

UPDATE: I finally got this to work last night. It's alot easier than it sound on Scoobymods.

First of all there are 2 yellow wires w/blue stripe going into the foglight switch. Just splice the yellow/blue wire thats in the corner of the backing plug (PIN 2) into the yellow/blue wire thats in the center (PIN 5). After that youll have a loose wire haning there from the PIN 2 location going back to the harness, just cover it up w/ electrical tape and put everything back together. Keep in mind the wiring diagram does show the opposite view of the plug since its from the othe side. FYI the diagram above is for MY00 RS but I did this on MY99 and it worked fine.

 

Good to know. I still need to do this on my wife's '00 RS. Thanks for making it super easy!

-Brian

 

OK, I finally got around to doing this mod myself tonight. The diagram from the service manual isn't altogether correct, particularly the part near "B162" which shows the headlight stalk switch connections. I clipped the pin 5 yellow/blue wire, and on the B162 end I found the following:

- headlights off: ground
- low-beam on: open
- high-beam on: +12V

That's really weird and pretty inconsistent with the diagram.

Nevertheless, the wiring on the switch side seems to be correct. Routing PIN 5 on the switch side to ground is indeed the correct way to do the mod. I did it by simply connecting it to a ground lug -- voila, fogs and high beams galore.

stg2lgcy00 said that connecting PIN 5 to ground caused problems, but I can only guess that maybe he accidentally connected the harness end, or perhaps the other yellow/blue wire.

Now, ideally we'd also want the fogs to come on with the parking lights, which is how they're supposed to be used (in conditions where there's too much backscatter from even the low beams). Unfortunately, this mod doesn't do that, yet....

The problem seems to be that the power supply for the relay coil is switched and only comes on with the low/high beams. The diagram at F45/B62 seems to indicate that it's connected directly to +12V, but that's not the whole story. Since we've done the "stage 1" mod, fixing the ground connection, then "stage 2" would logically be to supply power to the relay by jumpering the switch's PIN 1 position (blue/white wire) to +12V.

Since the illumination (pins 4/2) only comes on with the parking lights, that might seem to be an ideal source of switched +12V. But remember that there's a dimmer switch in there as well, which might not deliver enough power for the relay coil to actuate. On the other, hand, if the dimmer switch works on the ground side and one of the pins is a clean +12V, then we're home free. That's what I need to look up next. Unfortunately, I'm out of vampire clips so I'm electing to do this mod another day. Stay tuned for fog light stage 2.

 

Nice, I think Scoobymods has a "foglight only" mod (w/ no headlights) that you can use with the "highbeams + fogs" mod... but I haven't tried it. Still happily running fogs + highbeams but I almost never use it, just good to know its there if I need it.