The inflatable restraint passenger presence system (PPS) is used to monitor the weight of an occupant on the front outboard passenger seat and communicate the status to the sensing and diagnostic module (SDM) whether to enable or suppress the deployment of the instrument panel (I/P) module. The PPS consist of an electronic control module, silicone filled sensor pad, pressure sensor, seat belt tension retractor sensor, wiring harness, and PASSENGER AIR BAG ON/OFF indicators. The silicone filled sensor pad is located under the passenger seat foam cushion and is connected by a hose clamped to the 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 sends a voltage signal to the PPS module. If the pressure from the occupant's weight is less than a specified value, the PPS module will send a suppress signal to the SDM to disable the I/P module. If the pressure from the occupant's weight is higher than a specified value, the PPS module will send an enable signal to the SDM to enable the I/P module. The PPS module will notify the customer of the enable/disable status by illuminating either the ON or OFF indicator on the PASSENGER AIR BAG ON/OFF indicators. The PPS monitors itself for faults and will set flash DTC if a fault is detected. The PPS will also notify the SDM of a fault. The SDM will respond by setting DTC B0092 and requesting the instrument panel cluster (IPC) to illuminate the AIR BAG indicator.

Ignition voltage is between 9-16 volts.

Schematic Reference

SIR Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

SIR System Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information.

Important: When removing connectors inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected component/connector.

•	PPS module

•	SDM module

•	PPS wiring harness connector

•	SDM wiring harness connector

1. Ignition OFF, disconnect the harness connector at the inflatable restraint front PPS sensor.
2. Ignition OFF, test for less than 1 ohm between the low reference circuit terminal C and ground.

⇒	If not within the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the PPS.

3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal A and ground.

⇒	If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the PPS module.

⇒	If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the PPS module.

4. Ignition OFF, disconnect the harness connector at the PPS module.
5. Ignition OFF, test for infinte resistance between the signal circuit terminal B and ground.

⇒	If not the specified value, test the signal circuit for a short to ground.

6. Ignition ON, test for less than 1.0 volt between the signal circuit terminal B and ground.

⇒	If not within the specified range, test the signal circuit for a short to voltage.

7. Test for less than 1 ohm between the signal circuit terminal B at the sensor harness connector and terminal 6 at the PPS harness connector.

⇒	If greater than the specified range, test the signal circuit for an open/high resistance.

8. If all circuits test normal, test or replace the inflatable restraint PPS sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.