airbag check, how to turn off the check (SRS) airbag?

The SRS light is one of the items that uses a continuous monitor system. If the light is on there is a fault in the SRS system. The only way to reliably find the problem is to use a scan tool that can read the SRS system and discover the fault code(s) that are turning on the light and the specific testing of the circuit in question. Because of the way the system works you don't want to start using other testing methods as it's actually very easy to cause the SRS module to misfire and set off the bags if there is something done wrong.
https://www.2carpros.com/articles/how-to-gather-airbag-safety-system-codes