B0074 Code: Meaning, Causes, and Symptoms | OBD2 Codes
B0074 – Passenger Occupant Classification Sensor
B0074 Possible Symptoms
Air Bag Warning Light ON
B0074 Possible Causes
Faulty Passenger Occupant Classification Sensor,Passenger Occupant Classification Sensor harness is open or shorted,Passenger Occupant Classification Sensor circuit poor electrical connection,Faulty Sensing and Diagnostic Module (SDM)
The Passenger Presence System (PPS) uses a silicone filled sensor pad located underneath the passenger seat foam cushion and is connected by a hose clamp to a pressure sensor. The weight of the occupant sitting in the front passenger seat is measured as a pressure change within the bladder by the pressure sensor. The pressure sensor is a 3-wire sensor consisting of a power, ground, and signal circuit. The PPS continually monitors itself and if a fault in this circuit occurs, a Diagnostic Trouble Code (DTC) will set. When the Sensing and Diagnostic Module (SDM) detects this DTC within the PPS, it will notify the customer of the enable/disable status by turning ON the OFF indicator on the PASSENGER AIR BAG ON/OFF indicators. Then the PPS will communicate to the SDM through serial data communications that a PPS fault is present. The SDM will then suppress the deployment of the Instrument Panel (I/P) module and then turn the AIR BAG indicator ON.