Reasons Why High Beams Work but Low Beams Don't - information from the the pros at Shingle Springs Subaru

Unfortunately, high-beam headlights (or "brights") are no substitute for your regular low-beams in city and suburban traffic. They're just too bright and could annoy or even momentarily blind oncoming drivers. That makes it all the more frustrating when they're still working, but the low-beams are not. The way modern cars are wired, the brights and regular-beam headlights are on completely separate circuits. Below, we'll tell you what may have gone wrong with your car headlights. We'll also be glad to help get your car fixed in our state-of-the-art Subaru service center.

Halogen Car Headlight Bulb

4. Burned-Out Headlight Bulbs

If both of your low-beam headlights are out, but both of the high-beams work fine, it's possible that both of your low-beam halogen headlight bulbs have simply burned out. After all, the lightbulbs in a modern halogen headlamp unit can burn out just the same as light bulbs in your home or office. But it's unlikely that both bulbs would fail at the same time. Even though they're always on together, it's rare for both headlight units to fail at once. This problem is more likely to be caused by an electrical problem somewhere under the hood.

Modern Subaru LED headlights are tougher and shouldn't burn out over time, but if they stop working on your car, you'll want a technician experienced in the latest Subaru technology to take a closer look.

Checking Automotive Fuse

3. Blown Fuse

The electrical components on your car are protected by fuses. Along every electrical circuit, an included fuse is designed to melt and interrupt the flow of electricity if too much current flows through the circuit. That way, instead of damaging your vehicle's electrical accessories, electricity simply stops flowing and they'll stop working until the circuit is restored. If your headlights have stopped working, locate the fuse in your car connected to the low-beam headlights circuit. The fuse box is typically located under the hood or behind the dashboard. You can often find this information in your owner's manual or on the inside of the fuse box cover. If the fuse has blown, replacing it with a fuse rated for the same amperage will restore the circuit and should get your headlights working again.

2. Bad Relay

The switch on the dashboard or steering column that controls your headlights is just a simple, low-voltage switch. That makes it smaller and more convenient to use inside the cabin. However, the headlights themselves need a whole lot more power to shine brightly. The switch inside the cabin controls an electrical relay that's also in the fuse box. The solenoids inside these relays can go bad, and might need to be replaced. If you know your way around the fuse box, you can even test your headlight relay. Just find an identical relay for a component you know is working and swap them. If the headlights work with the other relay, you now know the old relay went bad.

Car Multifunction Switch

1. Broken Multifunction Switch

While it's a simpler switch, the multifunction switch inside the vehicle itself can go bad, too. On many cars, a single switch controls headlights, turn signals, windshield wipers and more. If one or more of these functions stops responding, the multifunction switch inside the vehicle might need to be replaced.

As you can tell from the above, identifying the source of problems with electrical components like headlights on your vehicle can be tricky. That's why our technicians are factory-trained with all the latest Subaru tools and technologies! We can diagnose the problem troubling your vehicle quickly and correctly.