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 MANUALSCHEVROLET2001CHEVY EXPRESS G3500, VAN PASSENGER EXTENDED, 6.5 FREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 6 (SUPPLEMENTAL INFLATABLE RESTRAINT SYSTEM)DIAGNOSTIC TESTSSDM INTEGRITY CHECKDIAGNOSTIC PROCEDURE
2001 Chevrolet Chevy Express G3500, Van Passenger Extended, 6.5 F
Diagnostic Procedure
2001 Chevrolet Chevy Express G3500, Van Passenger Extended, 6.5 FSECTION Diagnostic Procedure
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 1999 GMC Savana Special, 1999 GMC Savana Camper Special, 1999 GMC Savana, 1999 Chevrolet RV Cutaway, and 1999 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
- If SIR Diagnostic System Check has been performed, go to next step. If SIR Diagnostic System Check has not been performed, go to SIR DIAGNOSTIC SYSTEM CHECK .
- Turn ignition off. Reconnect all SIR components and ensure all components are properly mounted. Wait 30 seconds after ignition is turned off. Turn ignition on and observe air bag warning light. If light flashes 7 times and goes off, symptom or DTC is no longer occurring. Clear SIR DTCs and repeat SIR DIAGNOSTIC SYSTEM CHECK
. If light does not flash 7 times and go off, go to next step.NOTE: It is extremely unlikely that a malfunctioning SDM would cause a new malfunction to occur during diagnostic process.
- Using scan tool, read DTC display. If same symptom or DTC occurs as when SIR Diagnostic System Check was first performed, go to next step. If not, refer to diagnostic procedure for appropriate malfunction.
- Clear SIR DTCs. Turn ignition off and wait 30 seconds. Turn ignition on and observe air bag warning light. If light flashes 7 times and goes off, symptom or DTC is no longer occurring. Clear SIR DTCs and repeat SIR DIAGNOSTIC SYSTEM CHECK . If light does not flash 7 times and go off, go to next step.
- Turn ignition off. Replace SDM. See SENSING & DIAGNOSTIC MODULE (SDM) under REMOVAL & INSTALLATION .
- Reconnect all SIR components and ensure all components properly mounted. Repeat SIR DIAGNOSTIC SYSTEM CHECK .
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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.