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 1841 (SUPPLEMENTAL INFLATABLE RESTRAINT SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC B0090CIRCUIT/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 does not describe the selected car, but rather 6 other vehicles, including the 2009 GMC Savana Special, 2009 GMC Savana Camper Special, 2009 GMC Savana, 2009 Chevrolet RV Cutaway, and 2009 Chevrolet Cutaway. 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 to the following requires repair or replacement of the affected component/connector:
- The vehicle rollover sensor
- The SDM module
- The vehicle rollover sensor harness connector
- The SDM wiring harness connector
- Verify DTC B0090 39 or B0090 71 is not set.
- If either DTC is set, replace the rollover sensor.
- Verify DTC B0090 3A is not set.
- If the DTC is set, verify the correct part number ROS is installed in the vehicle. If the installed ROS is incorrect, replace the ROS.
- Ignition OFF, disconnect the harness connector at the ROS.
- Test for less than 5 ohms between the ground circuit terminal 6 and ground.
- If greater than the specified range, test the ground circuit for an open/high resistance.
- Ignition ON, verify a test lamp illuminates between the B+ circuit terminal 1 and ground.
- If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
- Test for less than 1 volt between the signal circuit terminal 5 and ground.
- If greater than the specified range, test the signal circuit for a short to voltage.
- Ignition OFF, disconnect the harness connector at the SDM.
- Test for less than 5 ohms between the signal circuit terminal 5 at the ROS harness connector and the signal circuit terminal 58 at the SDM harness connector.
- If greater than the specified range, test the signal circuit for an open/high resistance.
- Ignition ON, test for less than 1 volt between the signal circuit terminal 5 at the ROS harness connector and B+.
- If greater than the specified range, test the signal circuit for a short to ground.
- If all circuits test normal, replace the ROS.
- Reconnect all SIR components. Ignition ON, verify the DTC is not set as current.
- If the DTC resets as current, replace the SDM.
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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.