Front airbags are one of the key elements of passive safety in modern cars. They are designed to protect the driver and passengers in frontal collisions, reducing the risk of head and chest injuries. But how exactly do they work? Why are they called "frontal"? And what to do if the indicator lights up on the dashboard SRS (Supplemental Restraint System)?
In this article, we will analyze the structure of front airbags, their difference from side and curtain airbags, and also explain why checking them should become a mandatory item when buying a used car. You will learn how to diagnose malfunctions, when replacement is required, and what mistakes drivers most often make by ignoring safety system signals. If you've ever wondered why an airbag doesn't always deploy or how it "knows" when to deploy, the answers are below.
What are front airbags and where are they located?
Front airbags (front airbags) are inflatable bags that instantly open when there is a strong impact to the front of the car. Their main purpose is to prevent the driver/passenger's head and upper body from coming into contact with the steering wheel, dashboard or windshield. Unlike seat belts, which support the body, airbags absorb shock, distributing the load over a large area.
Where to look for them in the car:
- 🚗 For the driver: In the steering wheel hub (usually under the brand logo).
- 👨👩👧👦 For front passenger: at the top of the dashboard (glove compartment side).
- 🔧 Shock sensors: in front of the car (in the bumper, under the hood or on the side members).
- 💡 Control unit SRS: Usually under the center console or in the cabin.
It is important to understand that front airbags are only part of the system SRS (additional restraint system). It also includes seat belt squibs, side cushions and curtain airbags. However, it is the front ones that are triggered first in a frontal impact, since they are designed for the most dangerous types of accidents.
How front airbags work: from impact to deployment
The airbag deployment process takes less than 0.1 second - faster than a person can blink. Let's take a step-by-step look at what happens during an accident:
- Impact: Impact sensors (accelerometers) detect sudden deceleration of the vehicle (usually at speeds above
20–30 km/h). - Analysis: Control unit SRS compares data from sensors with embedded algorithms. If the impact meets the criteria (for example, a frontal impact at an angle of up to
30°), the system gives a command to operate. - Ignition: The airbag squib is activated - a special charge burns inside it, releasing a gas (usually nitrogen or argon).
- Inflating: Airbag expands at speed
200–300 km/h, filling with gas. At the same time, the seat belt squibs fire, tightening them. - deflating: Through
0.5–1 secondthe pillow begins to deflate through special holes so as not to block the view and not interfere with evacuation.
Interesting fact: modern airbags can deploy stepwise - for example, in the event of a light impact, they will open only 70% of the power to reduce the risk of injury from the airbag itself. This technology is used in cars Toyota Safety Sense, Volvo City Safety and other systems.
If the airbag does not deploy after an accident, this does not always mean a malfunction. It may not open if there is an impact at an acute angle, at low speed, or if the impact is not in the sensor area (for example, on the wing).
The difference between front airbags and side airbags and curtain airbags
Many people confuse front airbags with side or curtain airbags, but they have different tasks and coverage areas. Here are the key differences:
| Pillow type | Location | Protection zone | When it works | Features |
|---|---|---|---|---|
| Frontal | Steering wheel, dashboard | Driver/passenger head and chest | Head-on collision | The largest ones fire first |
| Lateral | Front seat backs | Torso and pelvis | Side impact | Smaller in size, often combined with curtains |
| Curtains | Ceiling along doors | Head in a side impact or rollover | Side collision, rollover | Long, cover the entire side area |
| Knees | Under the steering wheel or glove compartment | Driver/passenger knees | Head-on collision | Rarely found, usually in premium cars |
Side cushions and curtains do not replace frontal - they complement them. For example, with a diagonal impact (front-side), both of them can work. In some vehicles (eg Volvo XC90 or Mercedes S-Class) are installed even center cushions between the front seats to prevent passengers from colliding with each other.
Why don't airbags deploy when parking?
In slow collisions (for example, at speeds of 5–10 km/h), the sensors may not recognize the impact as an accident. This is done specifically to avoid false alarms and costly replacement of airbags after minor accidents.
When front airbags require replacement or repair
Airbags are disposable item. Once triggered, they must be replaced, as they are physically destroyed when deployed. However, there are other cases when intervention is required:
- ⚠️ The indicator is on SRS on the dashboard - this may mean a malfunction of the sensors, control unit or broken wiring.
- 🔧 The car was in an accident, even if the airbags did not work, the sensors could have been damaged.
- 🛠️ Replacing the steering wheel, dashboard or seats — during dismantling, the squibs can be damaged.
- 🕒 The service life has expired - manufacturers recommend checking pillows every
10–15 years(the gas generator loses its properties).
It is especially dangerous to ignore the lit indicator SRS. In some cases this may lead to false alarm airbags (for example, during heavy braking) or, conversely, to refusal in a critical situation. System diagnostics can only be carried out using a scanner (for example, Launch X431 or Autel MaxiCOM), which reads error codes from the control unit.
⚠️ Attention: Never attempt to disassemble a steering wheel or dashboard yourself unless you are confident in your skills. Airbag squibs contain explosives and may explode if not handled carefully. Even disconnecting the battery does not guarantee safety - in the system SRS there is a backup capacitor that retains charge until 10 minutes.
Do not ignore the signal - this may be critical to safety|Check fuses (usually F10 or F20 in the block)|Connect a diagnostic scanner to read the error code|Contact service if the error is related to the sensors or the SRS unit|Do not reset the error without eliminating the cause-->
How to check front airbags before buying a car
When purchasing a used car, checking the airbags should be a priority. Here's what to do:
- External inspection:
- Check the steering wheel and dashboard for signs of repair (uneven seams, plastic color mismatch).
- Inspect the seat backs - if the side airbags deployed, there will be signs of tearing in the upholstery.
- Electronics diagnostics:
- Connect the scanner and check the error history SRS. Even if the indicator is not lit, codes may be stored in memory (for example,
B1000— driver's airbag malfunction). - Make sure that all impact sensors are in place (their absence may indicate hidden repairs after an accident).
- Connect the scanner and check the error history SRS. Even if the indicator is not lit, codes may be stored in memory (for example,
- Request a vehicle history via Autocode or CarVertical — there may be records of accidents.
- If the seller claims that the pillows were replaced, ask for receipts or certificates.
One of the most dangerous deceptions is flashing the block SRSwhen, after an accident, the deployment of airbags is “erased” from memory, and the airbags themselves are not replaced. In this case, they will not work on the next strike. To avoid this, always have your car checked using specialized equipment.
⚠️ Attention: If the seller refuses to provide access to diagnostics or claims that “everything works, just the light comes on sometimes,” this is a reason to be wary. In 90% of cases this means that the airbags are faulty or have been removed.
Is it possible to turn off the front airbags?
Technically, you can turn off the airbags, but This is highly discouraged. There are only a few legitimate reasons for this:
- 👶 Installing a child seat in the front seat (in some cars, the passenger airbag can be turned off with a key or through the menu).
- 🔧 Repair work requiring removal of the steering wheel or dashboard (for example, replacing steering column switches).
- 🚘 Participation in motorsports where airbags can be a nuisance (but in this case they are usually removed completely rather than disabled).
How to disable the passenger airbag (for example Volkswagen Golf):
- Insert the key into the ignition and turn to position
ON(do not start the engine). - Locate the airbag switch on the side of the glove compartment (usually indicated by a pictogram
AIRBAG OFF). - Turn the key to position
OFF, then againON- The shutdown indicator should light up on the dashboard.
In most modern cars, the deactivation of the airbag is recorded in the unit's memory. SRS, and the next time you start the engine, the system may generate an error. If you are not sure of your actions, it is better to contact the service.
Disabling front airbags without a good reason violates safety rules and can lead to tragic consequences in an accident. In some countries (for example, the EU) this is considered a violation of technical regulations, and the car will not pass inspection.
Cost of replacing and repairing front airbags
The cost of replacing airbags depends on the make of the car, the type of airbag and the cause of the problem. Below are approximate prices for popular models (for 2026):
| Service | Budget segment (for example, Lada Vesta) | Middle segment (for example, Toyota Corolla) | Premium segment (for example, BMW 5 Series) |
|---|---|---|---|
| Replacing the driver's airbag | from 8,000 ₽ | from 15,000 ₽ | from 30,000 ₽ |
| Replacing the passenger airbag | from 10,000 ₽ | from 18,000 ₽ | from 35,000 ₽ |
| System diagnostics SRS | from 1,500 ₽ | from 2,500 ₽ | from 4,000 ₽ |
| Replacing the control unit SRS | from 12,000 ₽ | from 25,000 ₽ | from 50,000 ₽ |
| Resetting errors after an accident | from 2,000 ₽ | from 3,500 ₽ | from 6,000 ₽ |
It is worth considering that the price often does not include flashing the block SRS (if required) and replacement of related elements (for example, seat belts with squibs). On premium cars (for example, Mercedes-Benz or Audi) may be required linking a new unit to the car through a dealer scanner, which increases the price by 20–30%.
Saving on replacing pillows is dangerous - cheap analogues or used parts may not work in a critical situation. Always buy original spare parts or certified analogues (for example, TRW, Autoliv).
FAQ: Frequently asked questions about front airbags
Is it possible to drive with the indicator light on? SRS?
Technically possible, but highly undesirable. A lit indicator means that the safety system is faulty and the airbags may not deploy in the event of an accident. Additionally, in some cases this may lead to false alarm airbags (for example, during sudden braking), which can lead to injury and costly repairs.
Do the airbags deploy if the car rolls over?
No, frontal airbags are designed for frontal collisions only. Triggers when tipped over curtain airbags (if installed) and belt tensioners. In some vehicles (eg Volvo) there are separate rollover sensors that activate the side airbags and curtains.
Can I install airbags myself?
Strongly not recommended. Installation requires special equipment, electrical knowledge and compliance with safety precautions. Installation errors can lead to uncontrolled operation airbag or its failure in an accident. In addition, after replacement it is necessary to reset the errors in the block SRS and check the system on a diagnostic stand.
What to do if the airbag deployed, but there was no accident?
It's called false positive. The reasons may be different:
- Short circuit in the wiring.
- Damage to shock sensors (for example, after unqualified repairs).
- Control unit error SRS.
In this case it is necessary completely replace the deployed airbag and diagnose the system. You cannot drive with a torn airbag - it will not work in the next accident.
How often should airbags be checked?
Manufacturers recommend diagnosing the system SRS:
- Every
10,000–15,000 kmmileage (as part of scheduled maintenance). - After any accident, even a minor one.
- When buying a used car.
- If the indicator on the dashboard comes on SRS.
It is also worth checking the airbags if the car is larger 10 years — over time, the gas generator loses its properties.