(Updated on September 30, 2021)
There are a variety of different warning lights on the dashboard of a vehicle. Most people will only see them illuminate when there is a particular problem with their vehicle that is indicated by that light.
Whether you know it or not, you have probably already seen the airbag light illuminate without even realizing it. For example, when you get into your vehicle and start up your engine, you may see a warning light that is reminding you to put your seat belt on.
In some model cars, the seat belt light is the same as the airbag light. This means people are familiar with seeing this light as a warning about their seat belt. They are not used to seeing it as a warning about airbags. As a result, they may want to just ignore this light if it comes on without realizing that it is referring to a problem with the airbags and not the seat belt.
If you have your seat belt on and the airbag light is still lit up, then you shouldn’t ignore this light because it likely means you have at least one non-functional airbag in your vehicle.
It’s critical that you fix whatever problem there is with your airbag system because airbags are what may save your life if you get into a car accident. You don’t want to find out the hard way whether your airbags work or not.
What Can Cause the Airbag Light to Come On?
Below are five common causes of an airbag light coming on:
1) Airbag Deactivated
The most common cause for the airbag light coming on is that the airbag system is deactivated or turned off. There may be a few reasons for this which you had no control over.
There may be an issue with a crash sensor, SRS module, or other airbag component. Alternatively, the sensor in the passenger seat that determines whether that airbag should be active or not may be faulty.
2) Seat Belt Issue
Like previously mentioned, not putting on your seat belt could cause the airbag light to come on. But there could be other seat belt issues that may cause this light to come on as well.
Perhaps your seat belt does not snap securely into the buckle and stay in place. Maybe there is a problem with the sensors in the buckle and they don’t accurately tell the computer that you have fastened your seat belt.
Alternatively, there could be a problem with a seat belt pre-tensioner that may need to be repaired or replaced.
3) Small Accident
It is possible to get into a small car accident (aka fender bender) that doesn’t deploy your airbags, but it still causes the crash sensors to activate. This means your airbag light will stay on until you go to an auto repair shop or airbag specialist and have it repaired and necessary parts replaced.
A small accident may be a situation where you hit something with the front of your vehicle while you’re driving at under 8 mph. The crash sensors tend to be sensitive to any type of accident no matter how big or small.
4) Water Damage
If the internal components of your vehicle have water damage for whatever reason, then corrosion may form on the crash sensors of your airbag system.
This corrosion will distort their ability to function properly and it could result in the airbag light coming on.
5) Airbag System Not Reset
Once you’re in an accident which causes the airbags to deploy, simply replacing the airbag is not enough. Crash sensors, clock spring, seat belt pretensioners, and other SRS components must also be replaced. In addition, the airbag monitoring unit (the brains of the airbag system) will need to be reset or reprogrammed.
You will need to have a qualified mechanic or dealership reset/reprogram the SRS module so the airbag system can be used again. Alternatively, some companies allow you to ship them the airbag monitoring unit, they reset it for a fee, and then ship it back to you ready to install.
See Also: Average Airbag Replacement Costs
Minimum Speed for Airbag Deployment
Airbags are designed for deployment when the front (or near front) of your vehicle collides with another vehicle or solid barrier. However, in order for the airbags to deploy, the minimum speed that you need to be driving during your collision is between 8 mph and 14 mph.
Most people are driving way above these speeds when they crash, usually between 35 mph and 60 mph. The faster you’re going during a collision, the more that you’ll need an airbag to save your life.