Seat Belt Buckle
The two front seat belt buckles have Hall sensors and are connected to the SRS module. These connections are electrically separated from each other.
The Hall sensor detects whether the belt is engaged in the seat belt buckle or not and indicates this to the supplemental restraint system module (SRS). The information is used to set the activation level for airbags and seat belt tensioners. If a fault is detected in the seat belt buckles or in their terminals, an adjustment is made for this, depending on the type of fault.
The rear seat belt buckles can be connected (market dependent) to the central electronic module (CEM) which then transmits the status of the seat belt buckles to the SRS (supplemental restraint system) module via the controller area network (CAN). In the event of a fault in the rear seat belt buckles the seat belt tensioners will function as if the seatbelts are fastened (market dependent).