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 G3500, VAN PASSENGER EXTENDEDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 395 (SUPPLEMENTAL INFLATABLE RESTRAINT SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC B1370CIRCUIT/SYSTEM TESTING
2008 Chevrolet Chevy Express G3500, Van Passenger Extended
Circuit/System Testing
2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Circuit/System Testing
WARNING: This page is about a different car, the 2009 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.
- The SDM module
- The SDM wiring harness connector
- Ignition OFF, remove the Air Bag fuse from the right rear fuse center. Ignition ON, engine OFF test the voltage from the supply voltage side of the AIR BAG ignition 1 fuse to a ground with a DMM. The voltage should read 9-16 volts.
- If the voltage is less than 9-16 volts refer to Charging System Test .
- Remove the SDM connector, refer to SDM replacement Repair Instructions for connector location.
- With the Air Bag fuse remove test the ignition 1 voltage circuit between the rear fuse center and the SDM for a short to voltage or an open. Verify that a short to voltage or an open does not exist.
- If any of the above conditions are found make the appropriate repair.
- If all circuit test normal then replace the SDM.
IMPORTANT:
When removing connectors inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected component/connector.
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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.