Look is not activated by many rasons It is difficult to know without information, the Scaner are good as more help has all the answers or it would be good to check it with that to see what codes throw, start with there, now the Air Bag only bars it with scanner and it would be good to know how you know what it is is a belt sensor greetings.
It is true about the Airbac is only erased with the scanner, and they are generally open short failures and those things usually eliminated them with the Scaner and they no longer appear again, but if you want to disarms the belt at the base and Cheka if the open sensor works, according to your that is the problem, although I do not believe it.