Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2000S10/T10 P/U 2WD V6-4.3L VIN WREPAIR AND DIAGNOSISRESTRAINTS AND SAFETY SYSTEMSAIR BAG SYSTEMSDESCRIPTION AND OPERATIONSIR SYSTEM COMPONENT DESCRIPTION AND DEFINITIONSINFLATABLE RESTRAINT SENSING AND DIAGNOSTIC MODULE
2000 Chevrolet S10/T10 P/U 2WD V6-4.3L VIN W
Inflatable Restraint Sensing and Diagnostic Module
2000 Chevrolet S10/T10 P/U 2WD V6-4.3L VIN WSECTION Inflatable Restraint Sensing and Diagnostic Module
The inflatable restraint Sensing and Diagnostic Module (SDM) performs the following functions in the SIR system:
^ Energy Reserve - The SDM maintains 23 Volt Loop Reserve (23 VLR) energy supplies to provide deployment energy. Ignition voltage may provide deployment energy if the 23 Volt loop reserves malfunction.
^ Frontal Crash Detection - The SDM monitors vehicle velocity changes to detect frontal crashes that are severe enough to warrant deployment.
^ Air Bag Deployment - During a frontal crash of sufficient force, the SDM will cause enough current to flow through the inflator modules to deploy the air bags.
^ Frontal Crash Recording - The SDM records information regarding the SIR system status during a frontal crash.
^ Malfunction Detection - The SDM performs diagnostic monitoring of the SIR system electrical components. Upon detection of a circuit malfunction, the SDM will set a Diagnostic Trouble Code (DTC).
^ Malfunction Diagnosis - The SDM displays SIR diagnostic trouble codes (DTCs) and system status information through the use of a scan tool.
^ Driver Notification - The SDM warns the vehicle driver of SIR system malfunctions by controlling the AIR BAG warning lamp.
The SDM connects to the SIR wiring harness using a 18-way connector. The SDM harness connector uses a shorting bar across certain terminals in the contact area. Removal of the SDM Connector Position Assurance (CPA) or the harness connector itself will connect the AIR BAG warning lamp to ground through the shorting bar.
The AIR BAG warning lamp will come ON steady with power applied to the SDM when one of the following procedures are performed:
^ You remove the SDM CPA.
^ You disconnect the SDM harness connector.
The SDM receives power whenever the ignition switch is in the RUN or START positions.
^ Energy Reserve - The SDM maintains 23 Volt Loop Reserve (23 VLR) energy supplies to provide deployment energy. Ignition voltage may provide deployment energy if the 23 Volt loop reserves malfunction.
^ Frontal Crash Detection - The SDM monitors vehicle velocity changes to detect frontal crashes that are severe enough to warrant deployment.
^ Air Bag Deployment - During a frontal crash of sufficient force, the SDM will cause enough current to flow through the inflator modules to deploy the air bags.
^ Frontal Crash Recording - The SDM records information regarding the SIR system status during a frontal crash.
^ Malfunction Detection - The SDM performs diagnostic monitoring of the SIR system electrical components. Upon detection of a circuit malfunction, the SDM will set a Diagnostic Trouble Code (DTC).
^ Malfunction Diagnosis - The SDM displays SIR diagnostic trouble codes (DTCs) and system status information through the use of a scan tool.
^ Driver Notification - The SDM warns the vehicle driver of SIR system malfunctions by controlling the AIR BAG warning lamp.
The SDM connects to the SIR wiring harness using a 18-way connector. The SDM harness connector uses a shorting bar across certain terminals in the contact area. Removal of the SDM Connector Position Assurance (CPA) or the harness connector itself will connect the AIR BAG warning lamp to ground through the shorting bar.
The AIR BAG warning lamp will come ON steady with power applied to the SDM when one of the following procedures are performed:
^ You remove the SDM CPA.
^ You disconnect the SDM harness connector.
The SDM receives power whenever the ignition switch is in the RUN or START positions.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.