When inspecting seat belts, check for visible damage or wear on the belts, buckles, latch plates, and guide loops. Ensure the seat belt reminder light illuminates when the key is turned on. Seat belts should lock during sudden stops or impacts but allow free movement during normal driving. Retractors should securely hold the belt against the chest and automatically rewind when the buckle is unlatched. Replace any faulty parts found during these checks.