Weight Sensing System (WSS) control unit, component description - GF91.60-P-4069LAU

MODEL 216.3 with CODE (494) USA version as of Model Year 2009 /Modification Year 08 

MODEL 221.0 /1 as of 1.9.08 with CODE (494) USA version /Modification Year 08 

Shown on model 216 

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 

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 uses the pressure and belt tension to calculate the corresponding weight class and sends this to the central gateway control unit (N93) via interior CAN (CAN B). This routes the information via the chassis CAN (CAN E) to the restraint systems control unit (N2/7).

	Wiring diagram for Weight Sensing System (WSS) control unit	Model 216	PE91.60-P-2102-99CAA
		Model 221	PE91.60-P-2102-99SAA