Seat Occupant Classification Module - Air Bag: Description and Operation

GF91.60-P-4069CAU Weight Sensing System (WSS) Control Unit, Component Description
- with CODE (494) USA version

Component Identification:

Location
The WSS control unit is located in the seat frame of the front passenger seat.

Task
The WSS control unit has the following tasks:
^ Reading in of sensors
^ Evaluation of input factors
^ Output of signals

Reading in of sensors
The input factors are read in with the following connections:
^ Direct line

Direct line
The following sensors are read in via a direct line:
- Belt tension sensor (B48/3)
- Seat occupied recognition pressure sensor (B48/4)

Evaluation of input factors
The WSS control unit determines the weight (person or child seat) on the front passenger seat. This is determined via a pressure measurement in a gel mat filled with silicone. The pressure measurement is performed by the seat occupied recognition pressure sensor. The tractive force at the belt is transmitted via the belt tension sensor to the WSS control unit.
The WSS control unit calculates the corresponding weight class from the pressure and the belt tension.

Output of signals
The signals are output via the following line:
^ Interior CAN (CAN B)

Interior CAN
This information is sent over the interior CAN to the front driver SAM control unit with fuse and relay module (N10/1). This then routes the information over the chassis CAN (CAN E) to the supplemental restraint system control unit (N2/10).