First thing is never work in front of the airbag, always sit to the side so if it does go off it doesn't hit you! Unplug the battery. The airbags have yellow harnesses when you unplug one there's usually a yellow plug somewhere near it to plug up the harness while it's not in use to prevent a static shock from setting it off. If there's not a plug I would just put masking tape over the plug.I’ve never worked on an airbag system. What precautions are needed to prevent triggering the bags by mistake?