How do you turn the airbag light off on dash?

You buy a $30k- $150k scan tool, once you get it hooked up you check for any codes find the one for the air bag (mine was code "PO55-301A") and delete it

have fun with that

TO ADD TO THIS... Ignore the above "advice". Simply "deleting" or clearing a code will probably not fix the problem. It may, or better yet, PROBABLY WILL come back. A code is stored in the computer when the system detects a problem. It classifies the problem and stores the corresponding code in the vehicle for a mechanic to review later for diagnostic purposes. A light alomost certainly means a problem in the system, and it may be such that the system will not work as it should in a time of need. Take the vehicle to a competent service station and have it repaired, and this should turn the light out.