Front Air Bag problems of the 2001 Lexus RX300

I was involved in an accident where I collided with a pickup truck in front of me. We were traveling about 40 mph, when we both braked when a third car in front slammed on his brakes to make a sudden left turn without signaling. I'm concerned my airbags are defective because they did not deploy upon impact. There was substantial damage done to the front of my vehicle. It's a good thing the seat belt worked as it should, or I would have sustained injuries.