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 MANUALSCHEVROLET2008CHEVY EXPRESS G2500, VAN CARGO, 6.6 6REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1603 (SUPPLEMENTAL INFLATABLE RESTRAINT SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC B0079 OR B0080CIRCUIT/SYSTEM TESTING
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6
Circuit/System Testing
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Circuit/System Testing
WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT:
When removing connectors, inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected component/connector:
- Seat position sensor (SPS)
- Sensing and diagnostic module (SDM) module
- Seat position sensor wiring harness connector
- SDM wiring harness connector
- Ignition OFF, disconnect the harness connector at the SPS.
- Disconnect the harness connector at the SDM.
- Ignition ON, test for less than 1 V between the SPS signal circuit terminal 29 and ground.
- If greater than the specified range, test the circuit for a short to voltage.
- Ignition ON, test for less than 1 V between the SPS low reference circuit terminal 28 and ground.
- If greater than the specified range, test the circuit for a short to voltage.
- Test for infinite resistance between the SPS signal circuit terminal 29 and ground.
- If less than the specified value, test the circuit for a short to ground.
- Test for less than 1 Ξ© between the SPS signal circuit terminal 2 and the SDM terminal 29.
- If greater than the specified range, test the circuit for an open/high resistance.
- Test for less than 1 Ξ© between the SPS low reference circuit terminal 1 and the SDM terminal 28.
- If greater than the specified range, test the circuit for an open/high resistance.
- If all circuits test normal, replace the SPS.
- Reconnect all SIR components. Ignition ON, with a scan tool clear and recheck for DTCs.
- If the front end sensor DTC returns and is current, replace the SDM. After replacement, refer to Repair VerificationΒ .
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.