锟斤拷 If less than the specified value, test the signal circuit for a short to ground.
6. Ignition ON, test for less than 1 volt between the passenger seat belt tension sensor signal circuit terminal C X2 and ground.
锟斤拷 If greater than the specified range, test the circuit for a short to voltage
7. Test for less than 1 ohm between the PPS module signal circuit terminal 4(X88+HP2/Z88+HP2) or terminal 6 (-HP2/Z75+HP2) and the
passenger seat belt tension sensor terminal C X2.
锟斤拷 If greater than the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the PPS module.
8. If all circuits test normal, replace the passenger seat belt buckle which includes the seat belt tension sensor.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* SIR/SRS Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Wiring Repairs/SIR/SRS Wiring Repairs)
* Driver or Passenger Seat Belt Buckle Replacement (with HP2) (See: Restraints and Safety Systems/Seat Belt Systems/Seat Belt
Buckle/Service and Repair/Driver or Passenger Seat Belt Buckle Replacement)Driver or Passenger Seat Belt Buckle Replacement (without
HP2) (See: Restraints and Safety Systems/Seat Belt Systems/Seat Belt Buckle/Service and Repair/Driver or Passenger Seat Belt Buckle
Replacement)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for PPS replacement, setup, and programming
B0074
DTC B0074
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using the diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC B0074 03
- Passenger Occupant Classification Sensor Circuit Voltage Below Threshold
DTC B0074 07
- Passenger Occupant Classification Circuit Voltage Above Threshold
DTC B0074 08
- Passenger Occupant Classification Circuit Signal Invalid
Diagnostic Fault Information
Circuit/System Description
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 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 illuminating 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 illuminate the AIR BAG indicator.
Conditions for Running the DTC
