Headlight icons in a car: the meaning of all indicators on the dashboard

Why is it important to understand the headlight icons on your dashboard?

Have you ever suddenly noticed something on the dashboard while driving? unfamiliar headlight icon with an exclamation mark or a strikethrough symbol? Many drivers ignore these signals, attributing them to an “electronics glitch.” But such indicators are language your car, which warns of problems from a burnt out light bulb to a short circuit in the wiring. According to traffic police statistics, 38% of road accidents at night occur due to faulty lighting, which the driver ignored.

Modern cars are equipped with dozens of sensors that control the operation of headlights: low/high beam, fog lights (PTF), daytime running lights (DRL), turn signals and even adaptive systems type Matrix LED at Audi or IntelliLux at Opel. Each icon on the dashboard has its own meaning - from informational (high beam is on) to critical (open circuit in the headlight). Let's figure out what they mean and how to react correctly.

Main groups of headlight icons: color and shape

All indicators on the dashboard are divided into 3 categories by color, which signal varying degrees of urgency:

• 🟢 Green/blue - informational. They report whether the mode is on (for example, high beam or PTF). You can continue moving.
• 🟡 Yellow/orange - warning. Requires inspection as soon as possible (for example, a burnt-out DRL lamp).
• 🔴 Reds - critical. Stop immediately! This may be a short circuit or failure of both headlights.

By form icons are divided into:

• 💡 Stylized light bulbs — general lighting indicators.
• 🔦 Headlights with beams — high/low beam, adaptive systems.
• 🌫️ Headlights with wavy lines — fog lights (front/rear).
• ⚡ Lightning or exclamation point - fault in the circuit.

Interpretation of the light icons

These indicators appear when one or another lighting mode is activated. They does not indicate a malfunction, but only inform the driver.

Icon	Description	Action
🟢 💡 with rays down	Enabled low beam headlights	Normal mode for driving in the city and on the highway with oncoming traffic
🟢 💡 with rays up	Enabled high beam	Use only in unlit areas without oncoming traffic.
🟢 💡 with wavy lines in front	Included front fog lights (PTF)	Allowed to be used in fog, rain or snow together with low beam
🟢 💡 with wavy lines at the back	Included rear fog lights	It is forbidden to use unless absolutely necessary (it blinds those driving behind)
🟢 💡 with letter "A" or stylized arc	Mode activated automatic light (for example, Auto Light Control at Toyota)	The system automatically turns on the headlights when the light level decreases

Please note: on some models (eg Volkswagen Golf or Skoda Octavia) icon DRL (daytime running lights) may look like a stylized light bulb with a "D" or a horizontal line. These lights turn on automatically when the engine is started and do not require manual operation.

Warning Icons: When Inspection Required

Yellow or orange indicators indicate potential problems, which are not yet critical, but require attention. Most often they appear when:

• ⚠️ Burnt out lamp — headlight icon with an exclamation mark. For example, on Renault Duster This indicates a failure of the low beam lamp.
• ⚠️ Malfunctions in the DRL circuit — a stylized light bulb with a crossed out symbol. Found on Kia Rio and Hyundai Creta.
• ⚠️ Dirty headlight or light sensor - headlight icon with a wavy line (on cars with adaptive light, for example, BMW 5 Series).
• ⚠️ Incorrect operation of automatic light switching - flashing "A" icon in a circle (system Matrix LED at Audi or Multibeam LED at Mercedes).

For example, if on the dashboard Ford Focus The yellow headlight icon with an exclamation mark comes on, the action algorithm is as follows:

Check which lamp is not working (low/high, PTF)

Make sure the circuit fuse is not blown (see diagram in manual)

Replace the lamp with a similar one (for LED-headlights may require diagnostics)

Reset the error via the on-board computer menu or by disconnecting the battery -->

⚠️ Attention: If the icon does not disappear after replacing the lamp, the problem may be light control unit (for example, BCM at Chevrolet or CEM at Volvo). In this case, computer diagnostics are required - independent repairs can lead to failure of other systems!

Critical errors: red icons and malfunctions

Red indicators on the dashboard indicate a signal to immediate stop. They appear in case of serious malfunctions that can lead to:

• 🔥 Short circuit in the headlight circuit (risk of wiring fire).
• 🚗 Complete loss of lighting (for example, failure of both headlights on the highway).
• ⚡ Generator overload (if the problem is in the light control unit).

Let's look at the most dangerous signals:

Icon	Reason	Consequences of ignoring
🔴 💡 with zipper	Short circuit in the headlight circuit	Fire in the engine compartment, failure of the fuse box
🔴 💡 with a crossed out circle	Failure of both headlights (low/high beam)	Fine 500 rub. (Article 12.20 of the Administrative Code) + risk of an accident in the dark
🔴 💡 with thermometer	Overheating of the light control unit (for example, MLB at Mercedes)	All lights turn off, electronics fail

For example, on Volkswagen Passat B8 a red headlight icon with a lightning bolt often appears when oxidation of contacts in the fuse box (located under the hood on the left). The problem can be solved by cleaning the contacts and treating contact lubricant (for example, Liqui Moly Kontakt-Spray). But if the icon appeared on BMW X5 with the system Adaptive LED, the reason may be LED driver failure - here you can’t do without diagnostics.

⚠️ Attention: On hybrid and electric vehicles (e.g. Toyota Prius or Tesla Model 3) red headlight icon may indicate problems with the high voltage system, powering the LED modules. Attempting to repair it yourself is life-threatening - service equipment is required!

Features of icons on cars with adaptive light

Premium segment cars (Audi, BMW, Mercedes) and some mid-range models (Skoda Superb, Volkswagen Arteon) equipped adaptive light systems, which automatically adjust the direction and intensity of the beam. They are characterized by unique icons:

• 🔦 Curved arrow headlight — mode activated turning the light towards the steering wheel (for example, AFS at Opel Insignia).
• 🔦 Headlight with mesh beams - works Matrix LED or Laser Light (on Audi A8 or BMW i8).
• ⚠️ Headlight with exclamation mark and "AFS" inscription — malfunction of the adaptive light system (requires recalibration at a service station).

For example, on Mercedes E-Class (W213) headlight icon with inscription ADAPTIVE flashes when:

1. Contamination of the system chamber Multibeam LED.
2. Malfunction of the steering angle sensor.
3. Control unit failure Headlamp Control Module.

Sometimes it is enough to reset the error turn off/on ignition, but if the icon appears repeatedly, diagnostics with a scanner will be required (for example, Autel MaxiCOM or Launch X431).

What is adaptive light calibration?

Calibration is a procedure for adjusting the headlight angles and adjusting the light beam depending on the vehicle load, suspension height and other parameters. On machines with the system AFS (for example, Volvo XC90) calibration is required after:

- Replacing headlights or lamps

- Suspension repair

- Road accident (even minor)

- Replacing wheels with a non-standard size

Cost of calibration at a service station: from 1,500 to 5,000 rubles. depending on the model.

How to reset a headlight error without visiting a service station

If the headlight icon on the dashboard lights up after replacing the lamp or fuse, you can reset it yourself. The methods depend on the car brand:

Brand	Reset method	Note
Volkswagen, Skoda, Seat	Turn off the ignition, press and hold the daily mileage reset button	Works on models up to 2018 (eg Skoda Octavia A5)
Toyota, Lexus	Disconnect battery for 10 minutes or reset via menu Trip Information	On hybrids (for example, Toyota Camry Hybrid) requires a special scanner
Renault, Nissan	Turn on the ignition, press the brake pedal 3 times, turn off the ignition	Does not work on models with the system Easy Link (for example, Renault Arkana)
BMW, Mini	Via the iDrive menu: Car → Settings → Lighting → Reset	On models with IDrive 7.0 (for example, BMW 3 Series G20) access code required

On machines with can-bus (for example, Ford, Mazda) to reset headlight errors, a combination of buttons is often used:

1. Turn off the ignition.
2. Press and hold the "SETUP" and "RESET" buttons on the dashboard.
3. Turn on the ignition (without starting the engine).
4. Hold the buttons for 10 seconds until the icon goes out.

⚠️ Attention: On vehicles with the system Start-Stop (for example, Peugeot 3008 or Citroën C5 Aircross) disconnecting the battery to reset errors may result in resetting engine adaptations. After connecting the battery, the car needs to be “trained” again (let it run at idle for 5–10 minutes).

Frequently asked questions about headlight icons

🔹 Why does the headlight icon on the dashboard light up, but all the lamps work?

This is a typical situation for machines with lamp control system (for example, Volkswagen Golf or Audi A4). Reasons:

• 🔌 Oxidation of contacts in the lamp socket (even if it shines, the circuit resistance has changed).
• 📉 Voltage drop in the on-board network (check the generator and battery).
• 🤖 Failure of the current sensor in the light control unit (reflashing required).

Solution: clean the contacts, check the voltage with a multimeter (should be 13.8–14.4 V with the engine running).

🔹 Is it possible to drive with a yellow headlight icon on?

Technically yes, but with caveats:

• ✅ If this burnt out DRL lamp — there is no fine, but the inspector may issue a warning.
• ⚠️ If this PTF malfunction - fine 500 rubles. (Article 12.20 of the Administrative Code) when driving in conditions of poor visibility.
• ❌ If this low/high beam circuit open — driving in the dark is prohibited (fine 500 rubles).

Tip: Always carry spare bulbs in the glove compartment (e.g. Osram Original Line or Philips LongLife).

🔹 Why doesn’t the icon on the dashboard disappear after replacing the lamp?

Probable reasons:

1. The lamp is incompatible with the control unit (for example, in LED headlight halogen lamp installed).
2. The error in the ECU memory has not been reset (you need to use a scanner or disconnect the battery).
3. The problem is light control unit (for example, BCM at Opel or CEM at Volvo).
4. Oxidation of contacts in the headlight connector (needs to be cleaned and treated contact lubricant).

For diagnostics, connect a scanner (for example, ELM327) and check the error codes. Frequent codes: B2477 (lamp circuit break), U1000 (loss of communication with the control unit).

🔹 How to distinguish the headlight fault icon from the light on icon?

Main differences:

Sign	Light on icon	Fault icon
Color	Green or blue	Yellow/orange/red
Additional characters	Blank headlight icon	Exclamation mark, lightning, strikethrough
Behavior	Lights up constantly when the light is on	Flashing or constant light regardless of whether the light is on

For example, on Hyundai Tucson A green headlight icon with downward beams means the low beam is on, and a yellow icon with an exclamation mark means a burnt-out lamp.

🔹 What to do if the headlight icon is on on the device, but the lamps are intact and the fuses are too bad?

This is a sign hidden fault. Follow the algorithm:

1. Check mass headlights (often oxidizes on the body under the headlight).
2. Measure voltage on the headlight connector (should be 12 V when the lights are off).
3. Call wiring from the fuse box to the headlight (look for an open circuit or short circuit).
4. Check light control unit (on some models, e.g. Ford Focus 3, it is combined with the block BCM).

If you do not have the skills to operate a multimeter, contact a service station. Average cost of diagnostics of electrical equipment: 1,000–2,000 rubles.