How-To: Stand Alone Fog Lights Mod - Lexus IS Forum
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post #1 of 104 (permalink) Old 09-01-2004, 11:05 PM Thread Starter
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How-To How-To: Stand Alone Fog Lights Mod

Does it annoy you that you can't turn your fog lights on by them selves? The IS requires you to have the headlamps on before you can switch on the fogs. This quick mod will bypass that check, and allow for the fogs to be on by themselves.


tools ratchet with 10mm fitting, wire strippers, crimping tool, fuze puller or tweezers plus 12" of 16 gauge wire, 1 female wire spade

difficulty 2/5

time About 15 minutes


Step 1: On the passenger side, pull up on the door plastic runner along the door sill. It is attached by clips and should pop right up with ease.


Step 2: Remove the kick panel cover to expose the fuze box. This is attached by metal clips, and requires a little more force.


Step 3: We need to access a relay which is behind the fuze panel. There are two 10mm bolts at the top and bottom of the fuze panel which you need to remove. You won't be able to completely pull out the fuze panel, but you only need to get it out a little to reach the relay. The relay you must pull out is the small top one. It is marked "fog".


Step 4: Look at the relay with the metal prongs facing you. There are two copper prongs which are horizontal. With the copper prongs at the top, you must bend the bottom left prong out as seen in the picture. Strip your piece of wire at both ends. Affix the female spade to one end, and crimp it. Now plug that end to the prong you just bent out.


Step 5: Plug the relay back in to the fuze panel. Run the wire out of the way so it can be attached to the front of the fuze panel, and you can now bolt the fuze panel back in place.


Step 6: On the front of the fuze panel, pull out the bottom fuze in the middle column. This is the ignition fuze. Wrap your wire around ONE of the prongs, then plug it back into place firmly. Make sure it goes all the way into the socket.


Test out your work by turning your key in the ignition. No need to start the car. Try switching only your fogs on without headlights, if it works you did it! Put your kickpanel and door sill back in place.


Thanks to TEG who originally thought up this idea, and to UCLA-IS300 for his revisions.


For a optimal connection at the fuse, use the BUSS mini-add-a-circuit device. You will need to pick up another 7.5A ATM fuse and you won't need wire. See the posts in the thread, but it will look like below.

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Last edited by jasonm4; 12-20-2012 at 07:07 PM.
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post #2 of 104 (permalink) Old 10-05-2004, 10:57 AM
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battery

Will the car battery have to be disconnected (- terminal) for this mod?
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post #3 of 104 (permalink) Old 10-07-2004, 01:18 PM
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Good question.

It is always a good rule of thumb to disconnect the negative battery terminal when working on any car wiring and electronics.
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post #4 of 104 (permalink) Old 10-07-2004, 11:27 PM
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great mod!

Tried the mod, and completed it in about 35 min. I also noticed that if you push the whole fuze panel up and out towards the drivers side it should release a lot easier to give more work room for releasing and re-inserting the relay. The hook like fastener is made of plastic so, pushing up slightly and out towards the driver side will help prevent the fastener from snapping.
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post #5 of 104 (permalink) Old 05-14-2005, 09:47 PM
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I just performed this mod in under 20 minutes, real easy to do, not to mention it looks great. Just to clarify for anyone else, though, it's 2 bolts total, one on the top and one on the bottom.

Have a question? Try the my.is FAQ or, if you can't find an answer there, search before posting your question (hopefully in the correct forum).

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post #6 of 104 (permalink) Old 09-16-2005, 10:52 PM
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I was going to ask about this.. I saw someones white IS here with the fogs on without the headlights and I couldn't get the one I test drove to do it.

Now I see, great DIY!

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post #7 of 104 (permalink) Old 09-20-2005, 05:30 PM
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can i still turn off my fog lights with the switch if i want too?
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post #8 of 104 (permalink) Old 10-21-2005, 08:30 PM
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Just did this today and im a happy customer. . .
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post #9 of 104 (permalink) Old 11-07-2005, 03:49 AM
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will it work with high beam

After the mod, will the fogs light stay on with high beams on?
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post #10 of 104 (permalink) Old 03-06-2006, 09:57 PM
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Mine took me only 20 to 30 mins, I luv it, it look soo agressive... it reminds me of the AE86 Dritter, hhahaha, thanks to the guy who made this post.
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post #11 of 104 (permalink) Old 03-13-2006, 06:28 PM
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If you turn off the car, will the foglights stay on?
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post #12 of 104 (permalink) Old 03-21-2006, 12:26 AM
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^^Yes, they will stay on when the car is off. A note for some of the newbies, after you pull the kick panel out of the clips, it is also held in by a plastic bolt thingy towards the front of the car that you can easily twist off with your hands. (I knew it was there, just noticed it is not stated in the DIY)

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post #13 of 104 (permalink) Old 05-14-2006, 11:04 AM
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great mod

Great mod. Took 15 minutes to do. However, instead of just wrapping wire around the fuse it is much easier and safer to just go to a local auto store and pick up and add a circuit kit. It plugs right into the fuse block and the wire is actually spliced and not just wrapped around the fuse.
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post #14 of 104 (permalink) Old 07-06-2006, 10:06 PM
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Took me about 5 minutes...really easy mod and gives it a different look without your headlights on...
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post #15 of 104 (permalink) Old 07-16-2006, 12:49 PM
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I did all of this and when the car is on I cannot turn the fogs off. The switch doesnt do anything, and when I turn my headlights off the fogs turn off.

What is wrong?

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