X Reasons Why Prius Gen 3 Blinkers and Hazard Lights Stopped Working

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prius gen 3 blinkers and hazard lights stopped working

The last thing you want is for someone to pull out before you because they didn’t see your blinkers or flashers!

There are several reasons why Toyota Prius Gen 3 hazard lights and blinkers have stopped working. These include burnt bulbs, faulty hazard switches, engine compartment fuse box issues, wiring harness problems, and defective turn signal assembly.

It can be a major inconvenience, especially if you use them while driving. This article will discuss the possible reasons why your hazard lights and blinkers stopped working, and we will provide some solutions to fix the problem.

With any luck, this will help you get to the bottom of the problem and have your car back in tip-top shape in no time!

How Do Blinkers, Hazard Lights, and Turn Signals Work? A Complete Wiring Diagram

Blinkers, hazard lights, and turn signals are important safety features on any vehicle. But how do they work? A complete wiring diagram will show you how these systems are interconnected.

The blinker system on a car is made up of three main parts: the turn signal switch, the flasher unit, and the bulbs. The turn signal switch is located on the steering column and is activated when you move the turn signal lever up or down.

This activates the flasher unit, which in turn sends power to the appropriate bulb. The bulbs are usually located in the headlight housing.

When you hit the brakes, the brake light switch completes the circuit and also sends power to the flasher unit. The flasher unit then sends power to the brake lights.

The hazard light system is similar to the blinker system, but there are two main differences. First, the hazard light switch is usually located on the dash instead of the steering column.

Second, the hazard lights come on automatically when you turn on the ignition and do not need to be manually activated.

Both the blinker and hazard light systems use relays to control the flow of electricity. A relay is an electromagnetic switch that is activated by an electric current.

When the current flowing through the relay is interrupted, the switch opens and closes, thus breaking or completing the circuit.

Relays are used in various applications, including car stereo systems, home security systems, and even some computer networks. In the case of blinkers and hazard lights, the relays control the flow of electricity to the bulbs.

And where does fuse come in all of this? Fuses are used to protect the electrical system from overloads. They are placed in between the battery and the relays.

If too much current flows through the circuit, the fuse will “blow” and stop the flow of electricity. This prevents damage to the electrical system.

Now that you know how blinkers, hazard lights, and turn signals work, you can check your car’s wiring diagram to see how they are interconnected.

10 Reasons Why Your Blinkers and Lights Aren’t Working Fine (+Solution)

There are several reasons your blinkers and hazard lights may have stopped working. Here are the top ten:

  1. Defective Flasher Relay
  2. Faulty Turn Signal Switch
  3. Blown Fuse
  4. Faulty Alternator
  5. Burnt Bulbs of Turn Signal Lights
  6. Wiring Issues
  7. Accidental Damage to Light Bulbs
  8. Faulty Emergency Flasher Switch
  9. Dead Battery
  10. Grounding Problems

Let us see each of these reasons in detail:

1. Defective Flasher Relay:

When you hit your blinker lever, a series of events are supposed to happen. First, the flasher relays get power from the turn signal switch.

Then, it sends an electric current to the blinker bulbs. The current makes the bulbs light up. When the bulbs are lit, they flash on and off at high speed.

This lets other drivers know that you’re turning. If your blinker lights are going bad, it’s most likely because the flasher relay is defective.

The relay is a small electrical component located in the fuse box. It’s usually marked with a symbol that looks like a light bulb surrounded by squiggly lines.

When the relay goes bad, it doesn’t get power from the turn signal switch. That means it can’t send an electric current to the blinker bulbs.

As a result, the bulbs don’t light up, or they only light up dimly. In some cases, the relay may get power from the switch, but it doesn’t send enough current to the bulbs.

2. Faulty Turn Signal Switch:

If you’ve ever been driving and noticed that your blinkers or headlights have stopped working, it is likely due to a faulty turn signal switch or faulty hazard switch.

This switch is located on the steering wheel column and is responsible for turning the blinkers and headlights on and off.

Over time, the switch can become worn down, which can cause electrical problems. When this happens, the connection between the switch and the bulbs can be interrupted, causing the lights to stop working.

3. Blown Fuse:

Another reason your blinkers or hazard lights may have stopped working is because the turn signal fuse has blown. The fuse is located in the fuse box and is responsible for protecting the electrical system from overloads.

When you blow a fuse, it interrupts the flow of electricity. This interruption can cause damage to the wiring, and over time, this damage can build up and cause the lights or blinkers to go out. Always ensure the fuse box cover is intact.

4. Faulty Alternator:

When your car’s blinkers, turn signals, or all the lights stop working, it can be due to a problem with the alternator.

The alternator is responsible for powering the electrical system in your car. It also charges the battery when the vehicle is running.

If the alternator fails, it can’t provide enough power to run the electrical system properly. This can cause the blinkers and hazard lights to go out.

In some cases, the entire electrical system can fail, leaving you stranded on the side of the road. If you notice that your blinkers and hazard lights are not working properly, have your car checked by a mechanic to see if the alternator is to blame.

5. Burnt Bulbs of Turn Signal Lights:

Burnt-out bulbs in your turn signal lights are one of the most common causes of malfunctioning turn signals. When a bulb burns out, it creates an open circuit that prevents electricity from flowing through to the other bulbs in the series.

As a result, the other bulbs will not light up, and the turn signal will not work properly. In some cases, all of the bulbs in the turn signal may need to be replaced. However, simply replacing the burnt-out bulb should be enough to fix the problem.

6. Wiring Issues:

Wiring issues are the most common problem with turn signals and hazard lights. Over time, the power wire insulation can become brittle and crack, allowing moisture and dirt inside.

This can cause the wire to short circuit, preventing the turn signal or blinker from working properly. The wire may even break completely, causing the light to go out entirely.

In addition, loose or frayed wires can also cause problems. If the wire is not securely fastened, it can vibrate loose and make contact with other parts of the car, resulting in a faulty connection.

7. Accidental Damage to Light Bulbs:

We’ve all been there. You’re driving and accidentally hit a pothole or curb. Now turn signal or blinker isn’t working. Or, you’re changing a light bulb and you drop it and break the filament.

These are examples of accidental damage to light bulbs, and unfortunately, it’s a pretty common cause of turn signals, blinkers, and hazard lights going bad. When the filament inside the light bulb is broken, it can no longer conduct electricity, and the light won’t work.

In some cases, the socket may also be damaged, making it difficult or impossible to replace the bulb. So, if you’re having trouble with your turn signals or hazard lights, check to see if the bulbs are damaged first – it might save you some time and money!

8. Faulty Emergency Flasher Switch:

A faulty emergency flasher can cause your blinkers and hazard lights to go bad. The switch is located on the steering column, near the headlight switch. When the switch is turned on, it sends a signal to the turn signal relay, which activates the turn signals.

If the switch is faulty, it can cause the hazard lights to stay on when they’re supposed to be off, or vice versa. In some cases, it can even cause both the left and right hazard lights to come on at the same time.

9. Dead Battery:

A dead battery is another common reason for turn signals to go bad. When the battery dies, it can no longer provide power to the car’s electrical system. This can cause several problems, including a loss of power to the turn signals, blinkers, and hazard lights.

In some cases, the battery discharge warning may be temporary and can be fixed by jump-starting the car or replacing the battery. However, in other cases, the problem may be more serious and may require a tow truck or a new battery.

10. Grounding Problems:

One of the most common problems with turn signals, blinkers, and hazard lights is grounding. If the ground connection is terrible, the light won’t work. The ground connection completes the circuit and allows the current to flow through the bulb.

When the ground connection is broken, the current can’t flow and the bulb won’t light up. There are a few different things that can cause a bad ground connection.

The most common is a loose or damaged wire. If the wire that connects the light to the ground is loose, it may not make a good connection and the light won’t work.

Another common problem is corrosion. Over time, the metal connections can corrode and break down, making it difficult for the current to flow.

Finally, if the light fixture itself is loose or damaged, it may not make a good connection to the ground. This can be caused by a bump or jar to the light, or simply by age and wear.

Symptoms of Bad Blinkers, Hazard Lights, and Turn Signals in Toyota Prius

If you have a Toyota Prius Gen III, you may experience some problems with your blinkers, hazard lights, and turn signals. Some of the symptoms that you may experience include:

1. Clicking Noise:

A relay inside the blinker assembly causes the clicking noise. When the relay is working properly, it completes an electrical circuit that causes the blinkers to flash.

However, when the relay is damaged or not working correctly, the electrical circuit is not completed and the blinkers do not work. The clicking noise occurs because the relay is trying to complete the electrical circuit but can’t.

2. Blinkers, Flashers, or Turn Signals Won’t Work:

Well, this might be the most obvious symptom, but it’s still worth mentioning. If your blinkers, flashers, or turn signals are not working, it would mean that these components have gone bad. Simple isn’t it?

3. Turn Signals Stay On:

If your turn signals stay on even when you’re not using them, it would indicate that there’s a problem with the turn signal switch.

When a turn signal bulb burns out, the filament inside the bulb breaks. This causes an electrical short, which in turn causes the turn signal to stay on.

While it may seem like a minor inconvenience, this can actually be quite dangerous. After all, if your turn signal is on, other drivers will expect you to turn.

So if you don’t actually turn, it could cause an accident. That’s why it’s always important to replace burned-out bulbs as soon as possible.

4. Turn Signals of One Side Don’t Work:

If the turn signals on one side of your car don’t work while the other side does, it’s most likely due to a problem with the wiring.

The wires in your car are constantly exposed to heat, vibration, and moisture, which can cause them to break down over time.

If the wires going to your turn signals are damaged, the signal won’t be able to make its way to the bulb. As a result, your turn signal will appear to be broken.

So next time your turn signal stops working, don’t automatically assume that you need to replace the bulb. Instead, check the wires for damage.

5. No Lights on Dashboard:

One of the safety features of most cars is the dashboard turn signal indicator. This small light lets the driver know when the turn signals are on so that they can make sure they’re not accidentally leaving them on and draining the battery.

However, these lights can sometimes go out without any obvious signs of damage. So why don’t they just stay lit until they burn out completely?

It turns out that these lights are actually connected to the turn signal switch. So, if the switch is damaged, the light will go out as well.

This can be a problem because it means that you might not realize that your turn signals are on until it’s too late.

How to Use Blinkers and Hazard Lights in Toyota Prius Properly?

When driving, you may find it necessary to use your blinkers or hazard lights. Here are some tips on how to use them properly in your Toyota Prius:

  1. If you need to change lanes, always turn on your blinker to let other drivers know. Don’t just rely on the car’s lane-keeping assist feature.
  2. When making a turn, you should also use your turn signals.
  3. If you have to stop on the side of the road, be sure to turn on your hazard lights so that other drivers will know.
  4. If your Prius has a flat tire, you can use the hazard lights to warn other drivers while you change the tire.
  5. Remember, always use your blinkers and hazard lights when it is safe to do so.
  6. Never use them as a way to try and avoid getting pulled over by the police.
  7. This could result in a ticket. Use them only when absolutely necessary.
  8. In general, it’s a good idea to use your hazard lights any time you are driving in an unusual or unexpected way.

How to Replace Turn Signal Bulbs in Toyota Prius?

If you need to replace a turn signal bulb in your Toyota Prius, follow these steps:

1. Preparations:

  • Park your vehicle on a flat surface and set the parking brake.
  • Turn off the engine and open the hood.
  • Locate the turn signal bulb assembly on the front of the vehicle.
  • Disconnect the battery by removing the negative terminal first, then the positive terminal.

2. Removing the old bulb:

  • Body trims or some other components may need to be removed prior to accessing the turn signal bulb.
  • Once you have access, the wiring harness will need to be disconnected from the back of the turn signal bulb.
  • The wiring clips can be released by depressing the locking tab and then pulling the connector away from the bulb.
  • Next comes disconnecting the retaining spring that is holding the bulb in place.
  • Gently pull the old turn signal bulb out of the socket and discard it.

3. Installing the new bulb:

  • Insert the new turn signal bulb into the socket.
  • Make sure it is locked in place by the retaining spring.
  • Reconnect the wiring harness to the back of the new bulb.
  • Make sure that the locking tab on the connector is engaged so that it doesn’t come loose.

4. Reassembly & testing:

  • Put all of the components back in place and reconnect the battery terminals.
  • Start your engine and activate the turn signal to test if the new bulb is working.
  • Repeat these steps for each turn signal that needs to be replaced.

Cost of Replacing Turn Signals and Hazard Light in Prius Gen 3

It’s not exactly the most exciting part of owning a car, but replacing your turn signals and hazard lights is an important maintenance task. And if you own a Prius Gen 3, the cost of this repair can be a bit higher than average.

Turn signal bulbs typically cost between $5 and $10 each, and hazard light bulbs are between $10 and $20 each.

But on a Prius Gen 3, the turn signal bulbs are located in the headlight assembly, which means the entire assembly needs to be removed and disassembled in order to replace them. The labor costs for this repair can range from $50 to $100.

Hazard light bulbs are also located in the headlight assembly on a Prius Gen 3, but they’re much easier to replace than the turn signal bulbs. Labor costs for this repair are typically around $30.

So, all told, the cost of replacing both turn signals and hazard lights on a Prius Gen 3 can range from $85 to $230.

That may seem like a lot, but it’s important to remember that safety should always come first. And replacing your turn signals and hazard lights is one way to help ensure that you and your loved ones stay safe on the road.


The Prius is a great car, but like all cars, it has its problems. In this case, the blinkers and hazard lights stopped working.

It’s not clear why they stopped working, but it’s possible that there was a short in the wiring or that one of the bulbs went out.

We hope that this article has helped you understand the possible causes of why your Prius Gen 3’s blinkers and hazard lights may have stopped working.

Either way, it’s important to replace the blinkers and hazard lights as soon as possible so that you can stay safe on the road.

Frequently Asked Questions

Why do my blinkers randomly stop working?

Electrical signals are sent through wires to control the blinkers, and over time these wires can loosen and come detached.

Another possibility is a problem with the switch that controls the blinkers. If the switch is worn out, it may not be able to send a strong enough signal to activate the blinkers.

Whatever the cause, if your blinkers start acting up, it’s best to get them checked out by a mechanic. That way you can avoid getting into an accident – or just avoid getting honked at by other drivers!

Is it legal to drive without functioning turn signals?

Many states have laws that require drivers to use their turn signals when making a turn or changing lanes.

Turn signals serve an important function by alerting other drivers to your intentions. At night, they can be especially useful in preventing accidents.

Without functioning turn signals, other drivers may not be able to tell when you’re turning or changing lanes, which could lead to a serious collision.

So, next time you get behind the wheel, make sure those blinkers are in good working order. Your safety—and the safety of others—may just depend on it.

Is there a fuse for turn signals?

Yes, there is a fuse for turn signals. It’s usually located in the fuse box under the hood of the car. If the fuse blows, it means there’s an electrical problem somewhere in the system. The most likely cause is a short circuit.

Do hazard lights work when the ignition switch is on?

No, hazard lights do not work when the ignition switch is on. Hazard lights are only for use when the car is stopped on the side of the road.

If you have your hazard lights on while driving, it can be confusing for other drivers. So please, only use your hazard lights when you’re stopped on the side.

Is it safe to drive without working hazard Flashers?

No, it is not safe to drive without working hazard flashers. A lot of people see hazard lights as a kind of optional extra – something that’s nice to have but not strictly necessary.

But, there are actually several situations where it’s unsafe to drive without hazard lights. For example, when your car has broken down. You need to pull over to the side of the road. Hazard lights will make it much easier for other drivers to spot you.

Similarly, if you’re driving in heavy fog or rain, hazard lights can help make your car more visible. In general, it’s always safest to err on the side of caution when it comes to driving. If you’re not sure whether or not to use hazard lights, it’s always best to switch them on.

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