When the ignition is turned ON, the inflatable restraint sensing and diagnostic module (SDM) performs tests to diagnose critical malfunctions within itself. When the SDM has completed the power-up mode, the SDM will establish communication with the passenger presence system (PPS) module. The PPS module will respond by illuminating both the PASSENGER AIR BAG ON/OFF indicators for 5 seconds. The SDM will transmit a request message to the PPS module to receive the PPS module verification ID. The PPS module will transmit the verification ID to the SDM and the SDM will compare the ID received to data stored in memory. The SDM will also set DTC B0092 to notify the driver that the PPS module has a current malfunction present. When the SDM detects that the PPS module has set any one of the following DTCs 023, 024, 063, 064, or 065, the SDM will disable the instrument panel (I/P) module deployment loop, set DTC B0092, and command the AIR BAG indicator to continuously illuminate.

Ignition voltage is between 9-16 volts.

DTC B0092 is an indication that the SDM has lost communication with the PPS module or the PPS module has internal faults/DTCs. The SDM will communicate to request the verification ID from the PPS module for 5 seconds. If the SDM does not receive the verification ID from the PPS module within 5 seconds the SDM will set the DTC as current, illuminate the AIR BAG indicator, and disable the I/P deployment loop.

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.

1. Ignition ON, observe the function of the inflatable restraint passenger air bag ON and OFF indicators. The inflatable restraint passenger air bag ON and OFF indicators should illuminate.

⇒	If the inflatable restraint passenger air bag ON/OFF status indicators do not illuminate refer to Passenger Presence System Indicator Circuit Malfunction.

2. Ignition OFF, disconnect the harness connector at the PPS module.
3. Disconnect the harness connector at the SDM and the harness connector at the vehicle rollover sensor.
4. Test for infinite resistance between the serial data link terminal 18 and ground.

⇒	If less than the specified value, test the serial data link for a short to ground.

5. Test for less than 1 ohm between the PPS module serial data link terminal 18 and the SDM serial data link terminal 35.

⇒	If greater than the specified range, test the serial data link for an open/high resistance.

6. Ignition ON, test for less than 1-volt between the PPS module serial data link terminal 18 and the and ground.

⇒	If greater than the specified range, test the serial data link for a short to voltage.

7. If all circuits test normal, replace the PPS module.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.