In other words, DO NOT manually test, alter the airbag, alter the wiring, alter their function, or even look at them with a funny face unless you are certified to do so with the correct equipment.
Working with a possible defective airbag or airbag electrical system is one of the few things that scare the ***** out of me. I've had to change a few due to a bad integrated horn switch and it's one of the most nerve racking things I've ever done.
EDIT: Testing an electrical circuit for OHMs with an OHM-meter uses a very small current to measure the resistance. It's not much but it may be enough to cause an accident.
You don't want this to happen:
http://www.youtube.com/watch?v=N8NwyzVuMy8