Q&A

 Journeyman

The light come on when the system detects a problem and sets a trouble code. You should have it diagnosed by a trained technician. The airbag system is not for do it yourselfers.
The light is on because there is a problem with the air bag system. When the air bag light is on the system is not working and will not deploy in the event of an accident. When the air bag light is on the system has set a code(s) in the computer A scanning device can retrieve the code(s). The code(s) will give you a clue where the problem is. Many auto parts stores will read the code(s) from your vehicles computer for zip if you purchase the parts necessary to repair the vehicle from them. you have a false signal coming from the sensor harnes.
It means there is an issue with your airbag. You should have it diagnosed and repaired.
If the air bag light is coming on then you have a problem with the SRS. Seek professional help.
On most vehicles, the airbag light should come on for @6 seconds, and then go off if the system is working properly. If there is a fault or a problem in the system, the light will remain illuminated, or flash continuously. If the airbag light does not work properly, some vehicles have an audible tone that sounds indicating a problem with the airbag light system. When the light is on (or the tone is sounding), the airbag will NOT deploy, even in an accident.

Some vehicle manufacturers accommodate systems without a scanner (like Toyota, Lexus, Nissan, Infinity, Honda, Acura, Ford, Lincoln, Mazda & Mercury) and some require a scan tool