PURPOSE:
Performing this modification will change the behavior of the fog light switch. The factory design allows the fog lights to operate only when the low beams are on. The fog lights will now operate any time the ignition is on.

BACKGROUND:
Prior to this modification, the headlights only worked when the low beams were on. Additionally, the fog lamps turned off when the high beams were activated. I drive with my headlights on during the days and wanted to be able to use my fog lights as daytime running lights. In order to do accomplish these goals, the lights would need to be wired in such a way that the fog lights would turn on any time the fog light switch was turned on regardless of the headlight status. In addition, the lights would need to turn off whenever the ignition was turned off.

OVERVIEW:
The factory design uses a separate relay for the fog lights. The fog light relay coil circuit is in series with the headlamp circuit with the fog lamp switch being located after the relay. By simply replacing the relay's headlight power source with another ignition-based power source, we can achieve the desired behavior.

PROCEDURE:
STEP 1-
Located the relay box under the hood. Mine was on the driver's side fender. Identify the relay for the fog lamps using the guide on top. Mine was identified as "FR FOG". Remove the cover to expose the relays.

STEP 2-
Remove the factory relay. I chose to preserve the factory relay and replace it with a relay from Radio Shack, part number #275-0226. You will need to trim the mounting tab from the relay in order for it to fit in the relay box. Locate the pin on the relay labeled "85" and remove it completely.

STEP 3-
Remove the cover from the relay by prying it off with a small screwdriver.

STEP 4-
Identify the post inside the relay that corresponds to pin 85. Solder a wire to the post. Be sure that you have a good connection. I used brown wire since this is a common color for a wire that is active only when the ignition is on. Drill a hole or cut a small groove in the relay cover and thread the wire through it.

STEP 5-
Connect the brown wire to the new power supply source. I connected mine to the A/C relay in the relay box. I again replaced the relay with the same Radio Shack relay. Make the connection by soldering the wire to pin 30 and making a hole in the relay cover like you did in step 4. Do not remove any of the pins on the A/C relay. Replace the relays and test operation of the fog lamps and A/C.

If all goes well, you shall have independently functioning fog lights!

CURRENT MODS :
04/15/05 - BRM 2.5" Stainless Steel w/ 14" resonator Exhaust System
02/19/05 - B&M Short Shifter
04/29/06 - Eibach Prokit Springs & KYB AGX struts,
Osram Silverstar bulbs, Pioneer Speakers, Dual Air horns.

Original Jamaican RUDEBOY!!

Let us know - wish I knew about this when I had my S14a.

NALADUDE911

Check out my cardomain!
http://www.cardomain.com/ride/3392312
http://www.youtube.com/watch?v=VDmgvl2d0FE
http://forums.nicoclub.com/zerothread?id=465375
TOYOTA CAMRY XLE FOR SALE
http://forums.nicoclub.com/zer...93193

and lawless....those are stock bulbs, i was using my 6 year old digital cam, so the colours dont seem accurate

Qxxx4 is exactly right. The only reason I used the A/C relay is because power to that circuit is only on when the ignition is on and it keeps the wires contained within the circuit breaker box. It also does nothing to affect the A/C. If you were uncomfortable with doing it that way, you could probe around for any wire that is only on with the ignition since it is only pulling a small amount of current to actuate the relay.

Check this out: http://forums.nicoclub.com/zer...e-22s
Talk to JonathanPrem

you can also just mod the fogs so that they stay on when the highbeams are switched on.

I took the relay mod out because it kept killing my battery when i watch things on my screen for a long period of time. I hooked it up to A/C but i reguire the ignition to watch things and i always forget about the fogs especially during the day.

the highbeam fog mod is easy you just need to ground the ground wire from your fog light switch to a solid ground. This is because normally when you switch on the highbeams the ground to the fogs are killed thus shutting them off. Regrounding it will stop this ground killing issue very simple.

You don't have to, but they are easier to open up and if anything happens all you have to do is pop the two Nissan relays back in.

I popped the relay off and placed it in the empty space next to the connector/socket it was in. i made three wires with connectors.

then i connected the wires as if it were plugged into the socket with the exception of the wire with the yellow connector which i ran from the cigarette lighter. this is the power source i chose to give the fogs power with the keys in the ignition.

Check here for bigger pics my previous post
http://forums.nicoclub.com/zerothread?id=359752

Modified by slickroger at 9:45 PM 7/30/2009