If its an option on your car you will be able to look in your owners manual and it will tell you how to do it.
The airbag light stays on when the computer detects a malfunction. The problem will need to be repaired before the light will turn off.
You need to have the airbag computer checked for trouble codes. The light will be on anytime there is a failure.
That is for the electronic throttle system. The computer turn that light on when it detects a malfunction.
That requires the dealers scan tool.
If the air bag s were deployed you will have to take the vehicle to the dealership to have the light turned off.
To reset your airbag light, in a Nissan Altima, you should turn the car on. From there, as soon as the airbag light stops flashing, turn the car off instantly. Repeat this three times to reset the airbag light.
If the airbag light is on, there is a defect somewhere in that circuit. You turn the light off by isolating and fixing the defect. Start with the fuse box.
To turn off the airbag light you need to give a firm, well placed punch to the person nearest to you.
Check the airbag ring wiring behind the airbag. does it turn on when you turn the wheel?
Diagnose and repair whatever is causing the fault that the light is warning you about. The airbag cannot and will not function while the light is on. Since the airbag is explosive and could be triggered accidentally while servicing it, this is not something for the typical DIYer to tinker with; Leave it to a professional mechanic with the appropriate certifications, tools, and skills.
You will need to have the entire computer system checked for trouble codes. At minimum the abs and airbag coomputers will have cods with those lights staying on. If you know the code numbers you can then diagnose.
Turn it off