A dark headlight can make a night drive unsafe, and two failed headlights can leave your Outback difficult to see and nearly impossible to drive legally. If your Subaru Outback headlights not working is the problem, the cause may be a burned-out bulb, a blown fuse, a control issue, or a wiring fault.
This guide explains how to spot the likely cause, check common parts safely, and decide when a repair needs a technician. You’ll also learn how symptoms differ between one failed lamp, both low beams, and automatic headlights.
Why Subaru Outback Headlights Not Working Can Have Several Causes
Headlights rely on a chain of parts, from the battery and fuses to the switch, wiring, and bulbs. A fault at any point can interrupt power, while some Outback models use electronic controls that require a scan tool to diagnose.
Start by noting exactly what works and what does not. The pattern can narrow the search before you remove a bulb or open the fuse box.
- One headlight is out: A failed bulb, connector, ground, or local wiring fault is more likely.
- Both low beams are out: Check the shared fuse, lighting controls, power supply, and any related module.
- High beams work, but low beams do not: Suspect low-beam bulbs, their circuit, or a low-beam control fault.
- Lights flicker or cut out: Look for a loose connector, poor ground, damaged wire, or charging problem.
- Automatic headlights behave oddly: Check the lighting setting, sensor area, and model-specific controls.
Start with These Safe Checks
Before buying parts, confirm the symptoms and check simple causes. Park on level ground, turn the ignition off, and set the parking brake before inspecting the engine bay or lamp connectors.
Do not work around wiring with the engine running. If you smell burning, see melted plastic, or find exposed wire, stop and arrange a professional inspection.
- Test each lighting mode. With the vehicle stationary, switch between parking lights, low beams, high beams, and fog lights if fitted. Note which lamps illuminate.
- Check the control setting. Move the headlight switch from AUTO to the manual headlight position. Some automatic systems may leave lamps off in bright conditions.
- Inspect the lamps from outside. Look for a broken filament on a halogen bulb, a cracked lens, moisture, or signs of heat around the housing.
- Check the battery. A weak battery or charging fault can cause unusual electrical behavior. If the engine cranks slowly or other lights dim, test the battery and charging system.
- Review the owner’s manual. Fuse locations and bulb types vary by model year and trim. Use the manual or fuse-box diagram for your exact Outback.
Never touch the glass of a halogen bulb with bare fingers. Oil from skin can create hot spots and shorten bulb life. Handle the bulb by its base, or use clean gloves.
How to Check Subaru Outback Headlight Fuses and Relays
A blown fuse can interrupt power to one or more lamps. Subaru fuse layouts differ by year, so identify the correct circuit from the vehicle’s manual or the diagram on the fuse-box cover rather than relying on a generic chart.
Many newer vehicles control lighting electronically, and not every model uses a replaceable headlight relay. Check the diagram before searching for a relay or removing parts.
Inspect the Correct Fuse
Turn the vehicle off and remove the key or switch off the ignition. Find the headlight fuse listed for the affected beam and side, then pull it with a fuse puller if one is provided.
A broken metal link or a darkened fuse can indicate failure. If the fuse looks intact, a multimeter or test light can confirm continuity, but only probe the circuit as the manual allows.
Replace a Blown Fuse Carefully
Replace a blown fuse only with one of the same amperage. The rating appears on the fuse and in the fuse-box guide. A higher-rated fuse can overheat wiring and create a fire risk.
If the replacement fuse blows again, stop replacing it. A recurring failure points to a short circuit, damaged wiring, a failing component, or another fault that needs diagnosis.
What to Know About Relays
On versions with a replaceable headlight relay, the manual may identify its location and function. A relay can fail, but swapping relays at random can cause new problems if the parts do not match.
Some Outbacks use body control electronics instead of a simple, separate relay for a lighting function. If the manual does not show a headlight relay, or if both beams remain out after basic checks, ask a shop to test the circuit and control module.
Check the Bulbs, Connectors, and Headlight Housing
A single failed lamp often comes down to its bulb or the connection that supplies power. The replacement process depends on the Outback’s model year, headlight type, and trim, so confirm the correct part before removing anything.
Some models use halogen bulbs, while others use HID or LED lighting. HID and LED assemblies can involve high voltage or sealed components, so leave those repairs to a qualified technician unless the owner’s manual describes a safe, simple service procedure.
Signs of a Failed Bulb
A halogen bulb may have a visibly broken filament or darkened glass. Some bulbs fail without obvious damage, so a visual check cannot rule out a bad bulb.
If only one side is out, and both sides use the same replaceable bulb type, a technician or experienced owner may compare the bulbs. Do not swap parts if the manual warns against it or the connector differs.
Look for a Loose or Damaged Connector
With the vehicle off and the lights cool, inspect the accessible connector for looseness, corrosion, water, or melted plastic. A connector that feels hot or shows burn marks can point to resistance or a poor electrical connection.
Do not pull on wires to remove a plug. Release its locking tab first, and avoid forcing a connector that will not move. A damaged plug may need replacement rather than cleaning.
Check for Moisture and Lens Damage
Light condensation can appear in some lamp housings as temperatures change, but standing water or persistent heavy fogging deserves attention. Water can corrode connectors and damage electronic components.
Inspect the lens and housing for cracks, loose seals, or impact damage. A leaking assembly may need resealing or replacement, depending on the design and the condition of its electronics.
Understand Why Both Low Beams May Fail Together
When both low beams stop working at once, two bulbs could have failed close together, but a shared electrical fault deserves attention. Check the low-beam fuse or fuses, switch setting, battery condition, and any model-specific control system.
High beams that still work provide a useful clue, but they do not prove that the low-beam bulbs or wiring are healthy. Different beams can use separate circuits or control paths.
| Symptom | Likely area to check | Useful next step |
|---|---|---|
| One low beam is out | Bulb, connector, ground, or local wiring | Inspect that side’s bulb and connection |
| Both low beams are out, high beams work | Low-beam circuit, fuse, switch, or control | Check the manual’s low-beam fuse information |
| Both low and high beams are out | Power supply, lighting switch, fuse, or module | Check battery condition and seek circuit testing |
| Lights flicker over bumps | Loose connection, ground, or damaged harness | Have the wiring inspected and secured |
| Automatic mode fails, manual works | Setting, sensor, or automatic-light control | Confirm the switch position and sensor area |
Use this table to guide your first checks, not as a diagnosis. Model year and equipment can change the circuit design, and a wiring diagram is the best reference for accurate testing.
Check Automatic Headlight Controls and Sensors
Automatic headlights may not turn on in bright conditions, even when the system works as designed. If manual headlights operate normally, check the switch setting and the sensor area before suspecting a failed lamp.
The location and operation of the light sensor depend on the model year. Keep the sensor clear of objects, stickers, or dirt, and check the owner’s manual for its location and test procedure.
- Set the headlight switch to AUTO, then test the system in a safe, suitably dark place.
- Try the manual headlight position to see whether the lamps come on.
- Check for dashboard messages or warning indicators related to lighting.
- Confirm that accessories or windshield work have not covered or disturbed the sensor.
Do not cover a sensor while driving to test it. If automatic operation remains unreliable after checking the setting and sensor area, a repair shop can scan the vehicle for control-system faults.
When to Test Wiring or Get Professional Help
Electrical testing can pinpoint a broken wire, poor ground, or control fault, but it requires the right tools and care. A multimeter helps measure voltage and continuity; a test light can check for power on suitable circuits.
Use the wiring diagram for the exact model year. Testing the wrong terminal or probing an electronic module can damage components or create a short.
Basic Voltage and Ground Checks
A technician checks whether the headlight connector receives the expected power when the relevant lights are switched on. If voltage reaches the connector but the lamp stays dark, the bulb or assembly may have failed.
If the connector has no power, the fault may sit farther upstream in a fuse, switch, relay, module, or wire. A ground-side fault can also prevent a lamp from operating even when power reaches the connector.
Situations That Call for a Shop
Get professional help if a fuse blows repeatedly, wiring looks melted, or both beams stay out after the basic checks. A shop can use Subaru-specific service information and scan tools to inspect control modules and stored fault codes.
HID systems can produce high voltage, and sealed LED assemblies may not have serviceable bulbs. Avoid opening or probing these systems unless the manufacturer’s service procedure specifically allows it.
Seek help promptly if the lights fail while driving at night. Pull over somewhere safe, use hazard lights as appropriate, and arrange roadside assistance rather than continuing in poor visibility.
Choose the Right Repair for Your Outback
The right fix depends on the failed part and the vehicle’s lighting setup. Replace only confirmed failed parts, and use the owner’s manual or a parts catalog matched to the vehicle identification number to confirm fitment.
A bulb replacement may be straightforward on one trim and difficult on another. Labor access, headlamp design, and required aiming checks can affect the repair.
- Replace a bulb when the correct replaceable bulb has failed and its connector and circuit look sound.
- Replace a fuse only after finding a blown fuse and using the same amperage rating. Investigate if the replacement fails again.
- Repair a connector or wire when inspection or electrical testing confirms damage, corrosion, or a poor connection.
- Repair or replace an assembly when a sealed LED or HID unit has failed, or when water damage has harmed the housing.
- Ask for circuit diagnosis when both lamps fail, a module fault appears, or basic checks do not identify the cause.
After a repair, test low beams, high beams, and automatic operation while the vehicle is parked. Confirm that the lamps point correctly; a replacement headlight assembly may need aiming to avoid poor visibility or glare for other drivers.
Prevent Repeat Headlight Problems
Regular checks can catch a weak bulb or damaged housing before a night drive. Make a quick lighting check part of routine vehicle care, especially before long trips or seasonal weather changes.
Use the bulb type specified for your year and trim. A bulb that fits physically may still have the wrong wattage or design, which can cause poor performance or heat-related damage.
- Check that both low beams, high beams, turn signals, and brake lights work.
- Keep headlight lenses clean and look for cracks or signs of water entry.
- Replace bulbs in pairs when the same-age bulbs show similar wear, if the vehicle uses matching replaceable bulbs.
- Secure wiring and connectors after service, and avoid pulling on harnesses.
- Ask a technician to inspect repeated fuse failures or flickering rather than fitting a larger fuse.
Fixing Outback Headlight Problems
Start by identifying whether one lamp, both low beams, or all headlights have failed. Check the correct fuse, bulb, connector, switch setting, and sensor before replacing parts.
Stop if a fuse blows again, wiring shows heat damage, or the vehicle uses a sealed or high-voltage lighting system. A technician can test the circuit and confirm the repair without risking further electrical damage.
Frequently Asked Questions
Can I Drive My Subaru Outback with One Headlight Out?
Driving with a failed headlight reduces visibility and can make it harder for other drivers to see your vehicle. Laws vary by location, but a working headlight system is generally required after dark. Arrange a repair promptly, and avoid night driving until both headlights work.
Why Do My Outback Headlights Flicker While Driving?
Flickering can result from a loose bulb connector, poor ground, damaged wiring, or a charging-system problem. Note whether the flicker affects one lamp or several electrical systems. If lights dim across the vehicle or wiring smells hot, stop driving and have the electrical system checked.
Can I Replace Subaru Outback Headlight Bulbs Myself?
Some Outback versions allow owner replacement of a halogen bulb, while others have limited access or use sealed LED or HID assemblies. Check the owner’s manual for your year and trim before starting. Follow its safety steps, and ask a technician if the procedure requires removing major components.
Why Do My High Beams Work but My Low Beams Do Not?
High and low beams may use separate bulbs, fuses, wiring paths, or electronic controls. A working high beam narrows the likely fault but does not confirm that the low-beam circuit has power. Check the correct fuse and bulb information in the manual, then seek circuit testing if the fault remains.
Should I Replace Both Headlight Bulbs at the Same Time?
If both sides use matching replaceable bulbs and one has failed after years of service, replacing the pair can help keep light output consistent. Follow the owner’s manual and use the specified bulb type. Do not replace a sealed LED or HID assembly as though it were a standard bulb.