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). The PPS will respond by illuminating both the PASSENGER AIR BAG ON/OFF indicators ON for 5 seconds. The SDM will transmit a request message to the PPS to receive the PPS verification ID. The PPS 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 has a current malfunction present. When the SDM detects that the PPS 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 illuminate the AIR BAG indicator.

Ignition 1 voltage is within the normal operating voltage range.

Important: DTC B0092 will also set, if the PPS has a current malfunction, and has set any one of the following DTCs 023, 024, 064, or 065. The SDM will set DTC B0092 as current and illuminate the AIR BAG indictor. This is done to notify the driver of any PPS malfunctions. When DTC B0092 is present, it is important to check the PPS for any current DTC. Refer to Passenger Presence System Flash Code Procedures. Any current PPS DTC must be diagnosed before performing this diagnostic procedure.

DTC B0092 is an indication that the SDM has received an incorrect PPS verification ID or has lost communication with the PPS. The SDM will continue to request the verification ID from the PPS for 5 seconds. If the SDM does not receive the correct verification ID from the PPS within 5 seconds, the SDM will set the DTC as current, illuminate the AIR BAG indicator, and disable the I/P module 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. Test for less than 1 ohm between the ground circuit terminal 5 and ground.

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

4. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 9 and ground.

⇒	If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.

5. Disconnect the harness connector at the SDM.
6. Test for infinite resistance between the serial data link terminal 18 and ground.

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

7. Test for less than 1 ohm between the PPS module serial data link terminal 18 and the SDM serial data link terminal 2.

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

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

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

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

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.