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.
If 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.
SRS ( supplement restraint system)if your light is on while driving, it means there is a malfunction in the system somewhere, which you should have checked. The light comes on because the airbag computer has detected a malfunction. You need to have the system checked for codes with a scan tool. You then need to have the cause repaired by a trained technician. Again I repeat, the airbag system is not a safe place for do it you selfers.
Either the bags have been deployed or there is a problem with the computer/sensors.
If it's the computer/sensor the bags won't deploy. First thing tomorrow morning, get this checked out!