LEMON Manuals: Even more car manuals for everyone
Home >> Saab >> 2004 >> 9-5 Linear, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 42 (Control Module (Late; 9440)) >> Technical Description >> Occupied seat cushion sensor, passenger, front (614P) >> Main function >> Connection

Main function: Connection

WARNING: This page is about a different car, the 2003 Saab 9-3. However, it is still accessible from the selected car via links, so may be relevant.

One pin is grounded internally in the BCM while the other receives a 5V feed via a built-in control module resistance of 47O. When weight is placed on the seat, the current load over resistance is reduced. The current value from the A/D sensor is converted and is then available in digital form. When the value is below 2.5V, it is surmised that the seat is occupied.

Fig 1: Identifying Occupied Seat Cushion Sensor, Passenger, Front (614P)
G03617318Courtesy of SAAB-SCANIA OF AMERICA, INC.
Fig 2: Connection Circuit Diagram
G03617319Courtesy of SAAB-SCANIA OF AMERICA, INC.

Burn-off:

The BCM sends a powerful current through the sensor to burn off any oxide in the connections for a duration of 600ms during ignition. The BCM feeds the sensor with a battery voltage via a 330O resistor. Polarity is reversed during normal operation which allows the entire burn-off current to pass through a diode built into the sensor.

scientia non olet · About LEMON Manuals