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Old 01-01-2011, 05:59 PM #31
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So I see a lot of people are interested in doing this, but can anyone point us in the right direction with the relays?
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Old 01-01-2011, 11:25 PM #32
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Quote:
Originally Posted by ThirdToy View Post
So I see a lot of people are interested in doing this, but can anyone point us in the right direction with the relays?
Found this after looking some more (this was how I performed the modification in my 4thGen). Any idea if it is similar on the 5th?
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Old 01-03-2011, 01:58 AM #33
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I have been wanting to control my factory fog lights separately also so I looked finding this dang elusive fog relay myself today.I couldn't find it either!! Doh!
According to the manuals and looking up under the dash......It seems the fog relay is different then the 4th Gen in that it is housed inside what they call the Main Body ECU.

The Main Body ECU is a little black box up under the drivers side dash. From what I saw and it comes out as a unit and the relay is probably inside as there is a pretty big wiring harness plug going to it.

Help!!!! To all you wiring diagram reading Spark Chasers.....From the factory wiring diagram,page 233
What does the shaded gray area mean,what does FFGO mean coming off the ECU and why does it seem like the tail light activates the fog relay???

I'm going to look into it again tomorrow night to see if I can pull that main body ecu out to find the relay.

I may just wire up my own relay on it's own circuit and switch for the fogs like I did for my PIAA fogs.I have some pre-wired Bosch/Tyco relays just lying around not being used anyways. I'll just pull the 15 amp fuse for the factory fog circuit, as I did find that up under the dash, and be done with it.
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Last edited by harper7; 01-03-2011 at 02:01 AM.
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Old 01-03-2011, 02:31 AM #34
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Quote:
Originally Posted by harper7 View Post
I have been wanting to control my factory fog lights separately also so I looked finding this dang elusive fog relay myself today.I couldn't find it either!! Doh!
According to the manuals and looking up under the dash......It seems the fog relay is different then the 4th Gen in that it is housed inside what they call the Main Body ECU.

The Main Body ECU is a little black box up under the drivers side dash. From what I saw and it comes out as a unit and the relay is probably inside as there is a pretty big wiring harness plug going to it.

Help!!!! To all you wiring diagram reading Spark Chasers.....From the factory wiring diagram,page 233
What does the shaded gray area mean,what does FFGO mean coming off the ECU and why does it seem like the tail light activates the fog relay???

I'm going to look into it again tomorrow night to see if I can pull that main body ecu out to find the relay.

I may just wire up my own relay on it's own circuit and switch for the fogs like I did for my PIAA fogs.I have some pre-wired Bosch/Tyco relays just lying around not being used anyways. I'll just pull the 15 amp fuse for the factory fog circuit, as I did find that up under the dash, and be done with it.
From a quick glance, the FFGO is the front fog wire, and the 13 (2D) refers to it's pin location in the connector, as referenced in the 2D pdf from nashman's resource. The actual relay appears to be in something called "Driver Side J/B Assembly Inner Circuit".

Edited to add:
Okay, so I approached it from the angle of having to troubleshoot non-working foglights. Based on the manual's troubleshooting and repair steps, the "Multiplex network body ECU" houses the relay and if it goes bad, you replace the whole ECU, not the relay.

You may find it is one sealed unit with no accessible parts to swap out.
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Last edited by SeattleMike; 01-03-2011 at 02:49 AM. Reason: Clarity
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Old 01-03-2011, 03:57 PM #35
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Quote:
Originally Posted by SeattleMike View Post
Based on the manual's troubleshooting and repair steps, the "Multiplex network body ECU" houses the relay and if it goes bad, you replace the whole ECU, not the relay.

You may find it is one sealed unit with no accessible parts to swap out.
Ut-oh! That would really stink as I loved the added light ability on my 4thGen (and 3rdGen)!
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Old 01-09-2011, 01:40 PM #36
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So has anyone figured anything out on the fog relay situation? It looks like this is going to be a real PITA. As Gary mentioned, the easier way may just be to wire up a relay and run it to an external switch...
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ICON Extended Remote Resi ~ ICON Rear 2.0 VS Shocks & Springs ~ LR UCA ~ Diff Drop Kit ~ HID 3000k Piaa 510's ~ Fogs Anytime Mod
H9 Lows and Fogs ~ 9011 HIR Highs ~ 275/60-20 AT3 ~ Black Dubs ~ 12v Anytime Mod ~ Satoshi Grill ~ Reverse Camera Anytime Mod
LED's in Rear Bumper ~ Husky Mats ~ LED's UnderHood ~ AVS Hood Protector ~ Plasti Dip Emblems ~ Factory Remote Start ~ CravenSpeed Antenna
LED's Everywhere ~ Fiamm Horns ~ GOBI Ladder ~ Ram Mount iPad Holder ~ Tailgating Cup Holders ~ Front Windows 20% ~ OEM Canadian Mud Flaps
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Old 01-23-2011, 06:19 PM #37
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I looked for the fog relay as I stated before. Toyota changed the way they do most of the relays now compared to the last Gen 4Runners. They are now modular with the relays inside them and not plugged in with prongs like we've grown accustom to.

So the only way I saw around it, without dissecting the modules(they look to be sealed), is is just hard wire my own relays in with a separate switch to switch the fogs on separately. Pulled the oem fog fuse to nullify that circuit.

The Philips 5k HID lights that I had in my fog lights already had their own relay and fuses anyways so it was pretty easy to do for me. I just had to wire a switch from my Painless fuse box to activate the relays. I bought some Carling V switches and mounted them in the dash and wired them up.

Alot of wiring as the switches take 5 wires each because of 2 separate light circuits even though I did set up a grounding point inside. BTW ,an easy way to run wires thru a firewall is use the existing hole with rubber grommet on the drivers side.I learned from an old timer years ago,To get the wires thru .....use a cheap bic or similar pen body ,the kind with the removable ink stick, take the back little cap off,push it thru the rubber grommet right alongside the wires/cable going thru,remove the ink stick from the inside and then pen body is hollow to feed the wire thru ,then go back inside and pull the wire thru and the pen body. Easier then trying to get a wire thru that tight grommet or making a new hole and sealing.

Here's some pics ,I put in a new switch for the compressor while I was at it.

These are the modules the relays are now housed in, up in the drivers side dash.There are 3 separate modules housed inside that bigger module there and the one up to the right is the TPMS ECU



Wiring to the back of the Carling V switches


I relocated the dash dimmer switch down with the rest of the OEM switches.


Out yesterday with just the oem FOGS on.
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Old 01-23-2011, 07:27 PM #38
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Great writeup Gary! I had a feeling it was going to come down to this. Next time I have the front bumper off, this is what I'll do. Thanks for all the research and awesome job with the clean install.
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ICON Extended Remote Resi ~ ICON Rear 2.0 VS Shocks & Springs ~ LR UCA ~ Diff Drop Kit ~ HID 3000k Piaa 510's ~ Fogs Anytime Mod
H9 Lows and Fogs ~ 9011 HIR Highs ~ 275/60-20 AT3 ~ Black Dubs ~ 12v Anytime Mod ~ Satoshi Grill ~ Reverse Camera Anytime Mod
LED's in Rear Bumper ~ Husky Mats ~ LED's UnderHood ~ AVS Hood Protector ~ Plasti Dip Emblems ~ Factory Remote Start ~ CravenSpeed Antenna
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Old 01-23-2011, 10:22 PM #39
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Harper
what philip HID lights did you use in your fog lights again? The gx and 4runner have the same fogs which turn off with high beam on.
which one is the oem fog fuse?

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Old 01-24-2011, 11:00 AM #40
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^ the reason Harper did it the way he did is the 5th gen doesn't have the same fog relay as older 4Runners. so the link you posted, with the method most people know for the mod, will not work on this generation.
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Old 06-20-2011, 01:30 AM #41
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Harper, how is the output of the HIDs in the factory foglights? I'm trying to decide whether to go that route or retrofit some is300 or blazer foglight projectors in there. Thanks
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Old 06-20-2011, 07:50 PM #42
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Harper, how is the output of the HIDs in the factory foglights? I'm trying to decide whether to go that route or retrofit some is300 or blazer foglight projectors in there. Thanks
The output from the HID's in the oem fogs is bright but scattered and has some glare.Not a very crisp cut off at all.
I have an extra set of oem fogs that I'm working on to put the blazer retrofit projectors in with 5k HID's.Fog Light: Blazers - HID Projectors from The Retrofit Source Inc
Got the Blazer kit and opened up the oem fog lens. But hav'nt cut/dremmeled them for the new projectors yet. Maybe next week end if it cools off ,as I was busy changing out my leather seat covers for cloth last weekend.....in the AC.It's just has silicone sealant(black RTV) holding the lens on.You just have to work it carefully around the edges with an exact knife. I'll take some pics when I put them together.
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Old 07-01-2011, 07:48 AM #43
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I know you guys are talking about a full relay mod, but on my Xterra we were able to accomplish a simlar change for the fog light on when low or high beam on by just moving one of the switch wires from the low beam wire to parking light wire. Can a similar mod be done to the 5G?
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Old 07-01-2011, 09:57 AM #44
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Here's how you do it:



http://www.toyota-4runner.org/5th-ge...-mod-done.html
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Old 07-01-2011, 01:54 PM #45
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This still looks like more work than it should be. Antman, nice work! Since I only have had my 4R 1 week, I'm going to dig a little more and review the wiring diagram. We should be able to snip the brown wire and connect it to the hot side of the light switch. but maybe I'm missing something.
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