Seat Occupant Sensor: Description and Operation

PPD (PASSENGER PRESENCE DETECTION)




The Passenger Presence Detection system detects the presence of passenger in the front passenger seat. The system is designed primarily to prevent replacement of airbag components that fire needlessly in an accident. The PPD system consists of a weight sensor unit.

The threshold for the PPD is : occupied (15 kg, 33 lb): not occupied (0.6 kg, 1.3 lb). The sensor characteristics are:

RP ≤ 50 k Ohms for W ≥ 15kg
RP > 50 k Ohms for W < 0.6 kg

(RP : Resistance of force sensing resistor)
(W : Mass of weight)