DTC 097

CIRCUIT DESCRIPTION

SIR Schematics: Power, Ground, Serial Data, Indicator and Front Inflatable Restraint Modules:

SIR Schematics: Seat Belt Pretensioners, Side Inflatable Restraint Modules, and Sensors:

When the ignition is first turned ON, the Inflatable Restraint Sensing And Diagnostic Module (SDM) performs tests to diagnose critical malfunctions within itself. The SDM is hard-wired to the Body Control Module (BCM) through the Deployment Commanded Output (DCO) circuit. During CONTINUOUS MONITORING, the SDM sends fixed frequency pulses to the BCM. In the event of a collision involving inflator module or seat belt pretensioner deployment, the SDM sends higher frequency pulses to the BCM, which in turn sends a Class 2 message to the ONSTAR module. Upon receiving the Class 2 message, the ONSTAR module transmits a DCO signal to the service center via the vehicle's cellular telephone.

CONDITIONS FOR RUNNING THE DTC
Ignition 1 voltage is within the normal operating voltage range.

CONDITIONS FOR SETTING THE DTC
The measured leakage current to voltage or the resistance of the DCO circuit are above a specified value caused by a short to voltage, open or a high resistance in the DCO circuit.

ACTION TAKEN WHEN THE DTC SETS
The SDM turns the AIR BAG indicator ON.

CONDITIONS FOR CLEARING THE DTC
^ The condition responsible for setting the DTC no longer exists and the scan tool Clear DTCs function is used.
^ A history DTC will clear once 255 malfunction free ignition cycles have occurred.

DIAGNOSTIC AIDS
Thoroughly inspect the wiring and the connectors. An incomplete inspection of the wiring and the connectors may result in misdiagnosis, causing a pan replacement with reappearance of the malfunction.

The following are possible causes of the malfunction:
^ A short to voltage, open or high resistance in the DCO circuit
^ The SDM connector
^ The BCM connector C1
^ An internal SDM malfunction
^ An internal BCM malfunction

If an intermittent condition exists, refer to Testing for Intermittent and Poor Connections in Diagrams.

TEST DESCRIPTION

Steps 1-10:

2. Tests to see if the SDM connector is damaged or corroded.
3. Tests to see if the SDM terminals are damaged or corroded.
4. Tests to see if the BCM connector C1 is damaged or corroded.
5. Tests to see if the BCM terminals are damaged or corroded.
6. Tests to see if there is a short to voltage, open or a high resistance in the DCO circuit.
7. Tests to see if the communication status and the units displayed for the DCO circuit are correct.