COMPONENT FAILURE: The driver-side front seat belt retractor & pyrotechnic pretensioner assembly spontaneously & violently deployed while the vehicle was in motion. Immediately following the explosion, the vehicle's dashboard SRS/Airbag warning light illuminated & remains locked on. The component is currently intact & remains inside the vehicle; it is fully available for physical inspection upon request. SAFETY RISK: The component fired with a gunshot-like sound inside the enclosed cabin, forcefully locking & pinning the [XXX] driver against the seat. This sudden explosion & physical restraint severely startled the young driver, nearly causing a loss of vehicle control. Had this occurred seconds later as we exited the subdivision & turned onto CR 346 heading toward Whitehouse—which is a narrow, fast-moving two-lane county road with no shoulder—a severe head-on collision with oncoming traffic or a road-departure rollover would have been unavoidable. The incident caused ongoing shoulder/chest soreness to the [XXX] driver & extreme distress to an autistic passenger in the vehicle. Furthermore, the driver's safety belt is now completely flaccid & inoperable, leaving the driver with zero crash protection. DEALER CONFIRMATION: Not yet confirmed by tech. Dealer did not provide/offer an emergency drop-off or inspection stating a 4-day delay (Wednesday) would be likely- leaving 1-car family stranded. 3rd-PARTY INSPECTION: None. Vehicle remains parked at residence awaiting safe transpo