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 1229 (SUPPLEMENTAL INFLATABLE RESTRAINT SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC B1370CIRCUIT/SYSTEM VERIFICATION
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6
Circuit/System Verification
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Circuit/System Verification
WARNING: This page is about a different car, the 2008 Chevrolet Malibu Classic. 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 SDM module
- The SDM wiring harness connector
- Ignition OFF, disconnect the AIRBAG fuse at the body control module (BCM).
- Ignition ON, test for 9.0-16.0 volts on the supply voltage side of the AIRBAG fuse to ground.
- If not within the specified range, refer to DTC B1370-B1379, B1380-B1389, or B1440-B1443 .
- Ignition OFF, reconnect the AIRBAG fuse and disconnect the X1 harness connector at the SDM.
- Connect a test lamp between the ignition circuit terminal 2 and ground.
- Command the ignition ON and OFF by using the ignition switch, the test lamp should turn ON and OFF when changing between the commanded states.
- If the test lamp is always ON, test the ignition circuit for a short to voltage. If the circuit tests normal, replace the BCM
- If the test lamp is always OFF, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM
- If all circuits test normal, 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.