Seat belt buckle switch

The belt buckle switches indicate whether the seat belts have been fastened or not. The belt buckle switches are supplied with voltage by the MRS control unit. The current consumption of the switch is the signal for the switch position (seat belt fastened or not fastened). The belt buckle switches are monitored permanently as of terminal R On.

The signal from the seat belt buckle switch decides whether or not the seat belt tensioner is activated when needed. If the front passenger seat is detected as occupied via the signals from the seat occupancy mat without the belt buckle switch sending a signal, a seat belt warning is issued. Whether or not the belt tensioner on the passenger's side is activated depends on the status signal of the seat belt buckle switch (seat belt fastened or not fastened). If the seat belt is inserted in the belt buckle switch, the seatbelt tensioner is also triggered.