Air Bag Not Deploy problems of the 2008 Toyota Sienna

Driver is not required to fasten seat belt due to a problem wiring or failure of the seat belt latch. Worried that the airbag will not deploy in a crash.

I was in an accident where a majority of my front end was completely damaged. In fact the bumper was completely taken off with significant other damage which I have pictures off. Neither airbag deployed. Fortunately I was ok and did not sustain any injuries. I am just surprised by the size of the impact that the airbags did not deploy.

On day of the accident, it was snowing and road conditions were icy and slippery. As vehicle was going around the bend, driver noticed cars were stopped at a signal. Driver could not stop vehicle in time to avoid a crash since abs brakes locked all the wheels and the car was sliding and so driver swerved to avoid crashing into other cars and hit a tree head-on. Vehicle sustained front-end damage. Air bags did not deploy.

Was t-boned by someone who failed to yield on green. He was given a ticket. I was through the intersection going 34. 8 miles/hour at the triggering event. Has Toyota do inspection on car and "chip". It only registered a "front event". Repair costs are 12k, this included replacing both driver side doors????? why did the airbags not deploy or better yet why was there not even a side event registered when he clearly hit me in the side?? suffered a concussion and neck back injuries. Had my 6 and 2 year old in the back in car seats.