WSS control unit, task - GF91.60-P-4105-02PM
The WSS (Weight Sensing System) control unit (N2/13) determines the weight applied (person or child seat) on the front passenger seat with the aid of the following sensors:
- Belt tension sensor (B48/3)
- Pressure sensor (B48/4)
The pressure sensor (B48/4) sends the pressure data as determined in the gel mat to the WSS (Weight Sensing System) control unit (N2/13) over a discrete line. In addition to this the belt tension is read in with the aid of a belt tension sensor (B48/3) over a discrete line from the WSS (Weight Sensing System) control unit (N2/13). By using both sensors the WSS (Weight Sensing System) control unit (N2/13) recognizes the difference between a person and a child seat, because for a child seat a significantly greater force is detected on the belt tension sensor (B48/3) than for persons. The WSS (Weight Sensing System) control unit (N2/13) sends the collated data via the Controller Area Network bus Class B (interior) (CAN-B) to the restraint systems control unit (N2/7).
If the front passenger seat is not occupied or occupied by a child seat then the corresponding airbags and emergency tensioning retractor are not actuated.
The WSS (Weight Sensing System) control unit (N2/13) has primarily the following tasks:
- Reading in and supplying of the pressure sensor (B48/4) and belt tension sensor (B48/3)
- Calculation of weight classification with differentiation between person or child seat
- Placing the weight data on the CAN-B
- Self-testing of WSS (Weight Sensing System) control unit (N2/13) (with "circuit 15 ON" and with entries in fault memory)
On the WSS (Weight Sensing System) control unit (N2/13) work may be performed at "circuit 15C OFF" only, as otherwise the calibration in the WSS (Weight Sensing System) control unit (N2/13) will be influenced, which can subsequently lead to an incorrect assessment!