I was involved in a rear-end collision while stopped at an intersection. The impact was significant. During the crash, the front airbags did not deploy. More importantly, the seat belts in both front seats (driver and front passenger) failed to function as expected. Instead of tightening during impact, the seat belts appeared to loosen, allowing excessive forward movement of the occupants. As a result, I was thrown forward and struck the steering wheel. The lack of seat belt pretensioning raises serious concerns about a potential failure of the vehicleâs restraint system. This incident suggests that the seat belt pretensioners and/or related crash detection systems may not have activated properly under a significant collision event. I am concerned that this represents a safety defect that could increase the risk of injury in a crash. I request that this incident be investigated as a possible failure of the restraint system, including seat belt pretensioners and crash sensing mechanisms.