Belt Buckle Switch

The belt buckle switch is used to detect whether the seatbelt has been fastened or not. The detection signal is sent to the MRS4RD control unit. The signal is used as a criterion for selective triggering of the actuators in the event of a crash. The belt buckle switch is located in the seatbelt buckle on the driver and passenger seat.

The belt buckle switch is a two-wire Hall switch. The Hall switch is supplied by the MRS4RD control unit via a current-signal interface. The current draw of the switch is the signal for the switch position. The belt buckle switch is permanently diagnosed and monitored in all electrical system statuses from Terminal R "ON" onwards.