prius 2g fog lights only come on w/low beam. How do I override to get them to turn on with high beams also?

Answer 1

that is illigal and unsafe for other drivers. there is a reason the car comanys don't wire them that way.

Answer 2

The others are right, in a way. High beams do not work in the fog as well as low beams. So the fog lights are wired to the low beams, because that is where they will be effective.
There are other auxiliary lights called "Driving Lights" meant to supplement the high beams.
So if you want more light with the high beams these are the ones you will want to buy and install.
The light patterns are different and so is the brightness.
But beware that in some states (like Nebraska) only one pair of non factory lights are allowed. But the way around this is to buy a set that comes in a single enclosure.
I know TMI.

Answer 3

To answer you specific question, you would need to remove the power supply wire from each light and wire it on a separate circuit with it's own switch.
As the others have pointed out, this 'could' be a violation of local traffic code depending on where you live. In Oregon it is illegal to operate with more than four white lights visible to the front on a public roadway, so, you actually could run single beam hi/low with two white fog lamp/driving lights, just not dual beam highs + fogs.

Answer 4

You don't. They're "FOG" lights. For use while driving in fog. You never want to use high beams while driving in the fog, as the lights will be reflected off the water droplets which make up the fog and make it even harder for you to see. That's why they have the fog lights locked out by the high beams. They're for use only with low beams.

Answer 5

You don't. Driving lights can come on with the brights, fog lights only with low beams. That happens to be the law regarding them.

Answer 6

I would like to answer your question in the most direct way possible and then elaborate about what what other answers have alluded.

If you want the fog lights on at all times, you will need to acquire a wiring diagram for your vehicle and figure out the system for the fog light power. There is a relay system that turns off the fog lights when the driver selects high beams. A person familiar with 12 volt electrical can look at a diagram and tell you to bridge this relay or terminal to accomplish what you want.

Now, let’s talk about automotive lighting in general.

The standard lighting as we know it is high beam and low beam. Low beam lights use the lens and some light diffusers to project light some distance ahead of the vehicle and toward the right side of the road, but not too much ahead. This prevents oncoming drivers from being blinded by your lights. Everyone knows what it is like to meet a car with its high beams on.

High beam lights throw out as much light as possible, as far as possible to illuminate as much road as far ahead as possible . Using an beam of light that is not shielded or dispersed like our low beams. This allows us to drive at high speeds at night without "overdriving" our lights. This is great until we meet an oncoming vehicle. So, as a courteous driver we change to low beams to prevent the aforementioned blinding.

So, what about fog? Fog is water vapor that has condensed in the air, and this presents a problem because the fog reflects our headlights back at us. You know what happens when you turn on your high beam lights in heavy fog. You can’t see as well as you could with your low beams on, right? The answer to this is fog lights. Fog lights are mounted low on the vehicle and project a wide, undiffused light to try to go under the fog. They work great in foggy conditions, exactly as they are designed to do.

The problem I have is with drivers who use fog lights when it is not foggy. That wide undiffused light that helps you in the fog is a lot like high beam lights in that they totally blind oncoming drivers. If you are one of those people who drives around with fog lights on all the time, you might wonder why people flash their lights at you. It's because you fog lights are blinding people as bad as high beams.

So turn off you frigging fog lights people. You are blinding me. As a final example, try this... Drive along a very dark road with low beams and no fog lights. Look as far ahead as you can with only the low beams on. Turn on you fog lights. Can you see farther ahead? It’s brighter directly in front your car, but can you really see farther ahead?