ON TUESDAY MARCH 18, 2014 I WAS DRIVING A 2013 CHEVY SILVERADO AND REAR ENDED A CHEVY TAHAO AT APPROXIMATELY 20 MPH WITHOUT HITTING MY BRAKES. CONDITIONS AT THE TIME WERE CLEAR AND DRY ALTHOUGH VERY WINDY. I WAS THE ONLY PASSENGER IN MY TRUCK. I WAS WEARING MY SEATBELT. I HIT THE STEERING WHEEL WITH MY CHEST. THE ONSTAR SYSTEM CALLED TO SAY THEY COULD SEE I WAS IN AN ACCIDENT AND HELP WAS ON THE WAY. I EXCHANGED INFO WITH THE OTHER DRIVER AND RETURNED TO MY VEHICLE. THE SEATBELT WAS IN THE EXTENDED POSITION AND WOULD NOT EXTEND FURTHER OR RETRACT. ON THE DISPLAY PANEL IT HAD AN 'AIRBAG DEPLOYED' ICON AND MESSAGE 'SERVICE AIRBAG'. MY INSURANCE COMPANY GAVE ME A AUTO REPAIR SHOP TO GO TO FOR AN ESTIMATE, HOWEVER, THE SHOP TOLD ME THEY WOULD NOT TOUCH THE VEHICLE UNTIL A GM REPRESENTATIVE INVESTIGATED THE SYSTEM FIRST AS THEY FELT THE SEATBELT SHOULD HAVE PREVENTED ME FROM HITTING THE STEERING WHEEL. I CALLED GM AND SPOKE WITH WALTER IN CUSTOMER SERVICE. HE ARRANGED TO HAVE A 'THIRD PARTY' INVESTIGATOR COME AND DO A INTERROGATION OF THE SYSTEM AND ARRANGED FOR A LOANER VEHICLE. RAYTHEON REPRESENTATIVE 'JEFF" CALLED ME SUNDAY MARCH 20 AND STATED HE WAS TO INTERROGATE THE SYSTEM AND WOULD CONTACT ME FROM THE AIRPORT WHEN HE GOT TO TOWN ON WEDNESDAY MARCH 23. ON WEDNESDAY MARCH 23 I CALLED JEFF TO SEE IF HE WAS IN TOWN AND HE STATED HE WAS AT THE AIRPORT 'LEAVING' TOWN, HE HAD DONE HIS INVESTIGATION AND DETERMINED EVERYTHING WORKED LIKE IT SHOULD. I ASKED HIM IF I WAS SUPPOSED TO H