Updated at: 21-08-2022 - By: Lucas

Your car’s lighting system hasn’t evolved much over the years, despite all of the advancements in automobile technology. For many years, the procedure of debugging a car’s inability to turn off its lights has remained virtually unchanged.

How to Deal with Headlights that Won’t Turn Off

Why Won't My Car Lights Turn Off

First and foremost, don’t leave your car’s headlights on at all times while you sleep. In the morning, you’ll have to cope with a dead battery, which will drain your battery even more quickly.

Remove the Headlight Fuse

The quickest option is to remove the headlight fuse until you can figure out what’s wrong. The fuse might be found in a fuse box under the hood or in the dash area of the vehicle. On the cover of the fuse box is a diagram showing which fuses are connected to which parts of the system.

Locate and remove the headlights fuse with care.

Remove the Headlight Relay

If the headlight relay is more easily accessible than the fuse, another option is to remove it.

The larger rectangular boxes adjacent to the fuses in the fuse box are the relays. ‘ Remove the relay, and the batteries and headlights are no longer connected, just like removing a fuse is when it comes to electrical loads.

Disconnect the Battery

Fuse or relay replacement is the only option if that fails or you can’t locate the correct fuse or relay.

The negative battery connector can be found on the battery’s left side. It’s the dark-colored one. If you’re still unsure, there’s a () sign right next to the battery terminal. Pull the clamp from the battery by loosening the nut holding it in place.

Once the cable is disconnected, be sure that the negative battery terminal does not come into contact with it. When disconnecting the battery, keep in mind that the settings in your car’s electronic control unit may be erased, which may take some time to re-establish when the battery is reconnected.

Troubleshooting Common Malfunctioning Headlight Problems

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For the most part, a car’s lighting circuit consists of five components.

Your battery, fuse, and bulbs are all in working order if your headlights are on and won’t turn off. The challenge is to determine if the switch or the wiring is the source of the issue.

Let’s take a look at each of these scenarios:

1. Faulty Headlight Switch

Before turning off the ignition, turn off the headlights. After you turn off the ignition, some modern automobiles include light systems that stay on for a brief amount of time. If the lights go out before you turn off the ignition, you have a problem with the module that delays the lights from going out.

Deactivating the module that controls your vehicle’s daytime running lights (DRLs) is as simple as setting your parking brake.

Changing the module may fix the problem if the lights stay on even when the parking brake is applied. The feature can also be permanently removed by removing the module.

A short in your headlight switch could potentially be the cause of the excess heat. Your headlights may stay on indefinitely if the insulating cover or plastic switch mechanism inside the switch mechanism is melted by the heat.

2. Faulty Headlight Relay

The relay is connected to the headlight switch. A faulty relay is nothing more than a faulty magnetic switch.

Using a relay that is identical to the one that controls the headlights will allow you to see if the headlights will work. If your headlights dim or dim out, you’ll need to buy a new relay to fix the problem.

3. Faulty Daytime Running Light Module

Testing for a potential issue with a daytime running light module on a vehicle is more difficult.

Input is received by the relay attached to the daylight running module from a number of different places in your car. Indicator lights on your dashboard and the parking brake are only some of the sources of this light.

You can examine the continuity of various circuits and components if you can read a wiring diagram and have a test light and multimeter at your disposal. Unless you’re a seasoned do-it-yourselfer or car electrician, it’s better to leave the diagnosis to the professionals.

4. Faulty Light Sensor

If your automobile has automatic headlights, a sensor in the front of the vehicle activates the lights as the sun sets. Either in the centre of the plastic cover below your windscreen or near your rear view mirror, you’ll find these sunshine sensors.

This is a quick approach to see if this module has the answer you’re looking for. In order for my headlights to stop flashing, I must first switch them from auto to off or 0 on the headlight selector switch.

Are the Car Brake Lights on When Car is Off?

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The car’s brake lights are on when it’s not moving.

This means that the taillights are operating, which means that switches and wiring are the only possible causes.

5. Stuck Brake Light Switch

Located under the dashboard, right next to the brake pedal, is a switch for the brake lights. We can assume that the switch is locked in the closed position because it is open when driving and closes when applying the brake pedal.

Find the brake switch and see if the lever moves in tandem with the brake when it is depressed. For sure, your problem will get worse if the switch remains inactive.

The footwell around the pedals collects a lot of dust and moisture, which can lead to clogged switches. Doing so will remove any oil or other debris that may be impeding the switch from operating.

If the lights go out as soon as you disconnect the switch, you know it’s the problem.

6. Faulty Brake Light Switch

Disconnect the switch and see if it helps. If this fixes the problem and the brake light goes out, then you need replace the switch.

7. Shorted Out Wiring

It’s possible that worn wire is producing a short if unplugging the switch doesn’t help.

The Turn Signal Stays On

Leaving your turn signal on all the time can be dangerous. In either case, it will either continue to blink, or it will remain on without blinking. Flasher relay, defective switch, or grounding wire may be the cause of the problem if the indicator stalk doesn’t return to its central position.

Only one side of the turn signal can be lighted. On the other hand, this could be an indication of a blown bulb. Rapid blinking, on the other hand, is more common. The diagnosis will be confirmed if the dead bulb is replaced.

8. Fixing a Faulty Turn Signal Relay

It’s common to find the turn signal relay under the dashboard. If the turn signal lights go out after you remove the relay, you may need to replace it.

9. Repairing a faulty Turn Signal Switch

Upon re-centering the wheel, a spring inside the turn signal switches the device back to the off state.

You may fix the problem of your turn signal staying on by replacing a worn or broken spring.

10. Grounded Turn Signal Wiring

If the problem isn’t with the turn signal switch or relay, it’s most probable that the wiring has worn out and is shorting the circuit..

A short can drain the battery, damage components, and, in the worst case situation, cause a fire. As soon as you remove the turn signal fuse, you know you have a short circuit since the lights don’t go out.

It is better to remove the turn signal bulbs and send your automobile to an auto electrician for professional repair unless you are experienced in dealing with damaged wiring.


How long does it take for interior lights to drain the battery?

A automobile battery can be completely drained in four to eight hours, depending on the age and quantity of lights that have been left on.

Do interior lights turn off automatically?

As long as the switch isn’t firmly on, the inside lights will turn off. Unless you turn them off, the lights will stay on until you do. Unless the vehicle is started, several new cars contain a sensor that turns off the inside lights after a period of time. To ensure that the battery does not run out, this is done.


When a vehicle is turned off, the lights remain on for a variety of reasons. However, like with most electrical issues, finding a solution can be frustrating. When your car’s lights won’t turn off, we hope you found the information in this article to be helpful.