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 MANUALSCHEVROLET2006CHEVY EXPRESS G2500, VAN CARGO, 6.6 2REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1411 (SUPPLEMENTAL INFLATABLE RESTRAINT SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC B0079CIRCUIT/SYSTEM TESTING
2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2
Circuit/System Testing
2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2SECTION Circuit/System Testing
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2008 GMC Yukon XL, 2008 GMC Yukon, 2008 Chevrolet Tahoe, 2008 Chevrolet Suburban, and 2008 Chevrolet Avalanche. 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:
- The Seat Position Sensor (SPS)
- The Sensing and Diagnostic Module (SDM) module
- The seat position sensor wiring harness connector
- The 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 volt 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 volt 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 infinite resistance, test the circuit for a short to ground.
- Test for less than 1 ohm of the SPS signal circuit between the SDM harness connector terminal 29 and the SPS harness connector terminal 2.
- If greater than the specified range, test the circuit for an open/high resistance.
- Test for less than 1 ohm of the SPS low reference circuit between the SDM harness connector terminal 28 and the SPS harness connector terminal 1.
- 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 Verification .
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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.