The contact owns a 2004 Chevrolet Silverado. The contact stated that while the vehicle was parked in the driveway, he poured oil into the oil reservoir, and then placed the key into the ignition switch to turn on the vehicle when the air bags unexpectedly deployed without warning. The steering wheel air bag hit the contact's face and knocked him to the ground. The contact suffered cuts to his cheek, below his eye, and neck, as well as soreness to his neck, face, and back. The contact stated his left ear was ringing and he could not hear; however, no medical attention was received. The vehicle was not diagnosed nor repaired by an independent mechanic or dealer. The manufacturer was not made aware of the failure. The failure mileage was 173,000.