12/15/2020 - NOTICED 'SERVICE AIR BAG' WARNING IN MORNING AS I PULLED INTO PARKING FOR WORK. WHEN LEAVING FOR LUNCH NO WARNING ON - AS I PULLED OUT OF PARKING WARNING APPEARED AGAIN - AS I LEANED FORWARD TO READ - LOUD 'BANG' AND WAS PULLED BACK INTO SEAT BY HARD RETRACTION OF SEATBELT. FOLLOWED BY SMELL OF BURNING. PARKED CAR, STRUGGLED TO GET OUT OF SEATBELT - LOOKED AROUND FOR DAMAGE - NOTHING - ONLY SEATBELTS STUCK RETRACTED. DROVE HOME CAREFULLY - PLUGGED IN OBD 2 READER - FOUR CODES; B0015-04, B0022-00, B0052-04, B101D-00. FIRST TWO INDICATE SEAT BELT PRETENSIONER DEPLOYED, THIRD IS DEPLOYMENT COMMAND, FINAL IS ECU HARDWARE. TOOK TO ASE SHOP AND WAS INFORMED THAT THE CONTROL UNIT INDICATED A COLLISION - THERE WAS NO COLLISION - AND BELTS WERE DEPLOYED. ASKED WHAT CAUSED THIS AND RESPONSE WAS COMPUTER ERROR....I AM JUST THANKFUL I WAS MOVING AT 5 MPH VICE 65 ON THE HIGHWAY. GONNA COST $2500 TO FIX REPLACING SEATBELTS AND SRS CONTROL UNIT, AND A FEW DAY TO GET OVER A BRUISED SHOULDER