I WAS TRAVELLING AT APROXIMATELY 55 MPH. A FULL SIZED SILVERADO 4X4 PULLING A HORSE TRAILER FAILED TO STOP AT A STOP SIGN AND PULLED OUT IN FRONT OF ME. I APPLIED MY BRAKES AND HIT HM IN THE DRIVER DOOR. MY DRIVERSIDE AIRBAG DID NOT DEPLOY. MY WIFE WAS RIDING AS A PASSENGER. SHE WAS WEARING HER SHOULDER/SEATBELT. IT DID NOT LOCK IN PLACE AND HOLD HER BACK. SHE WAS THROWN FORWARD INTO THE DASHBOARD. SHE RECEIVED BRUISED RIBS AND A BRUISE ON HER FOREHEAD. THE PASSENGER SIDE AIRBAG HAD BEEN TURNED OFF DUE TO THE FACT THAT WE SOMETIMES TRANSPORT OUR GRANDCHILDREN. WE HAVE CONTACTED GM ABOUT THIS. WE WERE TOLD THAT THE CONDITIONS WERE NOT RIGHT FOR AIRBAG DEPLOYMENT OR FOR THE SEATBELT TO RESTRAIN! COME ON! I THOUGHT THESE THINGS WERE SUPPOSED TO BE SAFETY EQUIPMENT!!!!!