Have you ever wondered what the correct name is for the headlight located at the rear of the car? For many drivers, this element remains simply a “tail light,” although in reality its design is much more complex. Rear optics perform several critical functions at once: from brake warning to license plate illumination at night. An incorrect name can lead to confusion when purchasing spare parts or communicating with technicians at a car service center.
In this article we will figure out how officially called taillights in the technical documentation, what elements they consist of, and why their design differs from the headlights. You will also learn what lamps are used in modern cars, how to check their performance and what to do if the rear lights stop functioning. This information will be useful to both beginners and experienced car owners who want to understand the structure of their vehicle.
The official name for a taillight in a car
In technical documentation and among professionals, the taillight is called rear light (or rear block light, if we are talking about a solid structure). However, this is a general name. In fact, the rear optics consists of several independent elements, each of which has its own name:
- 🔴 Stop light - lights up when you press the brake pedal.
- 🟡 Side light — turns on together with the front dimensions to indicate the dimensions of the car in the dark.
- 🟠 Turn signal — turn signal synchronized with front indicators.
- ⚪ Reversing light — activated when reverse gear is engaged.
- 🔺 Fog light (if provided by design) - improves visibility in foggy conditions.
- 📛 License plate light - a mandatory element that illuminates the state number.
In modern cars, all these elements are often combined into a single block lamp, but in older models (for example, VAZ-2106 or Moskvich-412) they could be separated. It is important to understand that the term "headlight" usually refers to front lighting, while at the rear it is more correct to say “flashlight” or “rear optics”.
Interestingly, in English-speaking countries the tail light is called taillight (size) or rear lamp assembly (rear optics unit), and the brake light - brake light. These terms can be found in the instructions for foreign cars.
Tail light design: what does the block consist of?
The rear light unit is not just a plastic housing with bulbs. Its design includes several key components, each of which performs its own role:
- Housing - usually made of impact-resistant plastic (for example, polycarbonate) and protects internal elements from moisture and mechanical damage.
- Reflectors - metallized or chrome-plated surfaces that direct the light of the lamps in the desired direction.
- Diffuser - a transparent or tinted plastic panel that evenly distributes light and gives the lantern an aesthetic appearance.
- Lamps - can be halogen, LED or xenon (in premium models).
- Electronic board (in modern cars) - controls the operation of LEDs and can include dynamic brake light functions.
- Seals - rubber or silicone gaskets that prevent water from entering the unit.
In some vehicles (eg Audi A6 or BMW 5-series) rear lights are equipped dynamic direction indicators, where light elements light up sequentially, creating a “traveling wave” effect. Such solutions not only improve visibility, but also add a premium look to the car.
It is important to note that in recent car models (e.g. Tesla Model 3 or Mercedes-Benz EQS) taillights can be fully LED and even integrated with gesture recognition system, for example, flashing headlights when a driver with a key fob approaches.
Types of lamps in taillights: what to choose for replacement
Not only the brightness of the rear optics, but also its durability, energy consumption and even the appearance of the car depends on the type of lamps. Let's look at the main options:
| Lamp type | Service life | Energy consumption | Benefits | Disadvantages |
|---|---|---|---|---|
| Halogen | 500–1000 hours | Average | Low price, easy replacement | Heats up and fades over time |
| Light-emitting diode (LED) | 10,000–30,000 hours | Minimum | Bright light, long service life | More expensive than halogen, may require resistors |
| Xenon | 2000–3000 hours | High | Very bright light, stylish look | Dear ones, we require an ignition unit |
When choosing replacement lamps, pay attention to markingspecified in the vehicle's operating manual. For example, lamps are often used for brake lights P21/5W (double thread), and for dimensions - W5W. Installing lamps with the wrong wattage may result in cartridge overheating or even melting the plastic body of the flashlight.
⚠️ Attention: In some countries (eg Germany), using LED bulbs in flashlights that are not designed for them from the factory may be considered a traffic violation. Check local regulations before replacing.
If you decide to switch to LEDs, pay attention to models with built-in canbass (a resistor simulating the load of a halogen lamp). This will help avoid errors on the dashboard due to low LED power consumption.
How to check the functionality of the rear lights
Faulty taillights are not only a fine from the traffic police (according to Article 12.20 of the Code of Administrative Offenses), but also a direct threat to security. Their performance should be checked regularly, especially before long trips. Here's a simple algorithm:
☑️ Checking the rear lights
If any of the elements does not work, the reasons may be as follows:
- 💡 The lamp burned out (the most common reason).
- 🔌 The contacts in the cartridge or connector have oxidized.
- 🔋 Problems with wiring (break or short circuit).
- 🛠️ The fuse is faulty (usually located in the fuse box under the hood or in the passenger compartment).
- 📱 Failure in the electronic control unit (for vehicles with a CAN bus).
For diagnostics you can use multimeter in voltage test mode. For example, when the dimensions are turned on, the cartridge contacts should have 12 V. If there is voltage, but the lamp does not light, the problem is in the lamp itself or in the socket. If there is no voltage, look for a break in the wiring or a faulty fuse.
Before replacing the lamp, take a photograph of the location of the contacts in the socket - this will help to avoid mistakes when installing a new lamp, especially if the contacts are located asymmetrically.
Replacing the rear light: step-by-step instructions
If you find a malfunction, do not rush to go to a car service center. You can replace the lamp or the entire lamp unit yourself. Let's consider the process using popular models as an example (Toyota Corolla, Hyundai Solaris, Kia Rio):
- Open the trunk and find access to the taillight. In most cars it is secured with two or three bolts or latches.
- Disconnect the power connector. To do this, gently press the latch and pull the connector towards you.
- Remove the block light. In some models (for example, Volkswagen Polo) you will have to first unscrew the trunk trim.
- Replace the lamp:
- Turn the socket counterclockwise (for most lamps).
- Remove the burnt-out lamp and install a new one without touching the bulb with bare hands (grease marks will shorten the service life).
- Return the cartridge to its place and secure it.
If the entire unit needs to be replaced (due to a crack in the housing, for example), the process is similar, but may require adjustment (especially for reversing lights so that they do not blind other drivers).
⚠️ Attention: When replacing LED light units (for example, with Skoda Octavia or Ford Focus) may require them coding via a diagnostic scanner (for example, VCDS or Forscan). Without this procedure, new lights may not work or display errors on the dashboard.
Common problems with tail lights and their solutions
Even if the lamps are working properly, other problems may arise with the rear optics. Here are the most common ones and how to eliminate them:
| Problem | Possible reason | Solution |
|---|---|---|
| Water inside the lantern | The tightness of the seal is broken | Dry the lantern, replace the seal, seal with silicone |
| LED flickering | Poor quality lamps or voltage problems | Install lamps with stabilization driver or check the generator |
| Dim light dimensions | Oxidation of contacts or old lamp | Clean contacts, replace lamp |
| Error on the dashboard after replacing lamps | Incompatibility of LEDs with CAN bus | Install lamps with blende or resistor |
One of the most annoying problems is flashlight fogging. If condensation regularly accumulates inside the unit, this can lead to corrosion of contacts and failure of electronic components. In most cases, drying with a hairdryer (at minimum temperature!) and treating the seal with silicone grease helps. If the problem persists, the entire unit may need to be replaced.
What to do if the lantern is cracked?
If the crack is small, you can temporarily seal it with a clear sealant (for example, Loctite 406). However, this is not a long-term solution - replace the light as soon as possible, as moisture and dirt will penetrate inside, accelerating corrosion of the contacts.
Another common situation is The brake light does not work, but the lights are on. This is usually due to a burnt-out double-filament lamp (e.g. P21/5W), where one thread is responsible for the dimensions, and the other for the stop. The solution is simple: replace the lamp. If the problem remains after replacing, check brake pedal switch - it may be faulty or incorrectly adjusted.
Upgrading taillights: what can be improved
Many car owners want to make their rear lights more modern or functional. Here are some popular upgrade options:
- 🔧 Installation of LED lamps — improves visibility and reduces the load on the on-board network. Suitable models marked CAN-BUS friendly.
- 🎨 Tinting of lights - gives the car a sporty look, but it is important to comply with light transmission standards (at least 60% for brake lights).
- 💡 Dynamic turn signals — you can install special modules (for example, Morimoto XB LED), which create a smooth tanning effect.
- 🔄 Replacement with Euro lights - relevant for old domestic cars (for example, VAZ-2110) where the standard lights look outdated.
- 🛡️ Protective films — prevent scratches and chips on the lens.
When upgrading, it is important to remember compliance with traffic rules. For example, tinting brake lights below the red color below the norm can lead to a fine, and too bright LEDs can blind other drivers. Before installation, check that the selected components are certified for road use.
Any changes in the rear optics must preserve its basic functions: visibility of brake lights at a distance of at least 100 meters in the daytime and matching the color scheme (red for brake lights, orange for turn signals, white for reverse lights).
If you plan to install LED modules Instead of standard lamps, pay attention to models with the function auto-dimming (automatic mute). They reduce the brightness when the lights are on, so as not to blind drivers from behind.
FAQ: Frequently asked questions about tail lights
Is it possible to drive if one brake light does not work?
Technically it is possible, but this is a traffic violation (Article 12.5 of the Code of Administrative Offenses), for which a fine of 500 rubles is provided. In addition, it is dangerous - the driver behind may not notice that you are braking. It is recommended to correct the problem as quickly as possible.
What is the fine for tinted taillights?
If tinting reduces the light transmission of brake lights or dimensions below established standards, the traffic police inspector may issue a fine of 500 rubles (according to Article 12.5 Part 1). In some cases, you may need to remove the tint on site.
Why do the LED taillights blink?
This is due to the incompatibility of LEDs with the standard lamp control system (CAN-BUS). The solution is to install lamps with a built-in stabilizer or resistor (for example, load 50 ohm).
Is it possible to polish a cloudy flashlight lens yourself?
Yes, for this use special polishes for plastic (for example, 3M PlastX) or fine sandpaper (P1000 to P2500) followed by polishing. It is important not to overheat the plastic so that it does not deform.
What to do if water gets into the lantern?
First, dry the flashlight (you can use a hair dryer on low power). Then check the seal - if it is cracked, replace it. As a temporary solution, you can apply silicone sealant to the joints.