US Patent 10315619 Two-point supplemental seatbelt with secondary buckle

A vehicle includes seats having both a primary three-point seatbelt and a supplemental two-point seatbelt. Occupation of a first seat is determined. The three-point seatbelt is determined as being one of buckled and unbuckled. The two-point seatbelt is determined as being one of buckled and unbuckled. A warning signal is initiated upon determining that one of the seatbelts is unbuckled and the seat is occupied. The warning signal is terminated upon determining that both of the seatbelts are buckled and that the signal has been initiated.