Fog light on with high beams - can it be dine? - Toyota C-HR Forum
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post #1 of 11 (permalink) Old 02-28-2018, 07:04 PM Thread Starter
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Fog light on with high beams - can it be dine?

Has anyone moded their fogs to stay on with the high beams? There are plenty of tutorials about doing it on 4-Runner's, Tacoma's and Tundra's. Wonder if anyone has tried it on C-HR and can share the "how to" info.
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post #2 of 11 (permalink) Old 03-01-2018, 08:18 AM
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Thought it could be a setting in the infotainment system, didn't think you need to mess with the actual wiring themselves.
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post #3 of 11 (permalink) Old 03-01-2018, 11:51 AM Thread Starter
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US model automatically turns of the fog lights when headlights go to high beam.
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post #4 of 11 (permalink) Old 03-02-2018, 08:37 AM
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I think you'd have to put the fog lights on a separate toggle switch. Pretty sure its been wired that way to prevent draining the battery, as it likely pulls the energy from the fog lights when you switch on high beams. A workaround will require messing around with the fuse box, and unfortunately I'm no electrical expert.
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post #5 of 11 (permalink) Old 03-03-2018, 07:40 AM
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Originally Posted by zbyra View Post
US model automatically turns of the fog lights when headlights go to high beam.
I didn't realize this on the US models and so I tested it and sure enough, the high beams cause the fog lights to go off. I guess it makes sense, since you wouldn't ever run high beams in foggy conditions but It would be nice to be able to have them all on for those really dark, off road conditions.
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post #6 of 11 (permalink) Old 03-03-2018, 10:50 AM Thread Starter
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Fog lights don't really do much for better vision in real fog. They are wired to run at the same time as the low beams which by themself cause a white out vision. High beams do it even worse. For true best visibility in fog one needs to run amber light bulbs in headlights. However the factory fogs do a remarkable job at filling in the non illuminated void just in front of the car and to the sides. This void is even more pronounced when high beams are on since at that point the beams focus much farther down the road. For some unknown reason DOT here in US in their supreme wisdom thought that better visibility in front of the car would somehow interfere with drivers ability to view things at distance when high beams are on. I'm not smart enough to question their wisdom but I also know what works better for me. I already figured out how to modify the fog light relay so that it can be energized by taping the switch to ACC power on a seperate circuit. This gives you control to turn them on/off anytime the car is on, independent of headlights and automatically off with the car being off. The ideal solution for me is to figure a way so that the fogs come on with the headlights, remain on in either high or low beam mode and turn off when headlight turn off while the vehicle is still on. Basically I do not want them on during daytime. I know I can just manually turn them on/off with the switch but it's 2018 LOL.
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post #7 of 11 (permalink) Old 03-05-2018, 08:59 AM
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I thought fog lights worked by illuminating the street under the fog and headlights sits a bit too high up to serve the same purpose. Amber light bulbs may work better, but they're so ugly compared to LEDs.
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post #8 of 11 (permalink) Old 03-06-2018, 12:20 AM Thread Starter
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TubeMan if you truly want the best visibility in fog the amber lights will be the best choice. The way it works is that fog is nothing more than water vapor. All those micro droplets of water act as tiny mirrors and reflect light back to its source. The more light you throw at it the bigger the reflection (white out). Yellow/amber light will reflect at much lower rate and therefore is able to penetrate much deeper into the fog than white light. LED's produce very "white" light and are probably the worse for that purpose. For that reason and because they only work in concert with headlights I said the white fog lights are not so good in real fog. The headlights are already reflecting off of the fog and limiting vision. I simply want the fogs to stay on when high beams are on for reasons I stated above. Not really fog related. As far as LED's, I like the color temperature as well but the reality is the whiter (cooler) the light is, the less it is able to reach out in front of the vehicle. I drive through long stretches of empty highways and like to see as far as possible. I also like to have little more light to the sides and in front of the car when running high beams. White fog lights are really good for that.
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post #9 of 11 (permalink) Old 03-09-2018, 04:25 PM
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It will be great once GPS systems like what Google has start help telling us what's ahead because then we might just know what to expect before seeing it with out own eyes. Already we sort of get that through the traffic readings they produce.
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post #10 of 11 (permalink) Old 03-26-2018, 02:46 AM
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when it comes to fog light, i have a doubt. which color should i choose?
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