Just out of curiosity I ask this question:
It is my understanding that fog lites are designed to be used when there is
fog to prevent your headlites from being reflected back at you (and hence
blinding you). Now, this being said, every other vehicle fog lites come on
either when the switch is turned on or when turned on WITH the parking
lites... But on my '03 Tundra, my regular headlites need to be on for the
foglites to come on (and they go off when i turn on the highbeams, but I
expected that). Has anyone else experienced this or am I alone?
I hope I'm alone on this one, because the set-up doesn't make sense given
what I thought foglites were for...
That is both normal and legal. My '90 Geo Storm was the same way.
Many vehicles are modified to operate differently, and most
aftermarket systems are not installed to operate "legally".
Fog and driving lights shall NEVER be used without your low-beams.
The low-beam headlight has a low-level cutoff and will not reflect
back. The fog beams offer a much more broad coverage in front of the
vehicle, but their actual use is more for BEING SEEN than in improving
what you can see.
I do like running mine because they provide a better view of the side
of the road when it is very dark.
Low beam headlights have an optical cutoff to keep the light down on
the road, rather than up where the fog would make it bounce back at
you, so they really don't cause a whole lot of glare.
Your Tundra is wired from the factory to meet most US states'
Vehicle Codes, which require them to be on with (not instead of) the
Go read the legalese yourself:
And if you get the urge to add fog taillights, there's
The idea is not to save you from any and all glare, but to stop
morons from driving around with only their parking and fog lights on
"because it really looks cool" - in real foggy conditions, it's too
easy for other oncoming traffic to not realize that the object without
the white headlights on is really a moving car (not just parked with
the parking lights on) and drive into their path.
And before you say it, I'm not sure how many states have these
rules, but I'm pretty sure it's widespread. It's easier for Toyota to
just follow the most restrictive, and sell the same car in all 50
--<< Bruce >>--
Bruce L. Bergman, Woodland Hills (Los Angeles) CA - Desktop
Electrician for Westend Electric - CA726700
I have a 2000 Quad V8 and it does what you are describing. Talk to Toyota
about I and they said this is by design and mandated by law for automobiles
with foglites to turn off when the high beam are on. Does not make any sense
but I am fine with it.
This law goes back to the days of quad headlights. If someone turned his
high beams on and his driving/fog lamps, you had 6 bulbs blinding on-coming
Nowadays, when you turn you high beams on, the low beams stay on, so to make
it legal, the driving/fog lamps are disabled.
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