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 1493 (SUPPLEMENTAL INFLATABLE RESTRAINT SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC B0012 OR B0013CIRCUIT/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 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, corrosion or poor connection. Damage or corrosion to the following requires repair or replacement of the affected component/connector:
The connector and connector position assurance (CPA) may seat independent of each other. Both the connector and CPA should seat with an audible and/or tactile click. The CPA isolates the shorting-bars within the connector allowing the deployment circuit to operate properly.
- Pretensioner
- Air bag module
- SDM module
- Air bag wiring harness connector
- SDM wiring harness connector
The connector and connector position assurance (CPA) may seat independent of each other. Both the connector and CPA should seat with an audible and/or tactile click. The CPA isolates the shorting-bars within the connector allowing the deployment circuit to operate properly.
- Verify that the steering wheel inflator restraint module connector and CPA are engaged.
- If the above condition is not found, make the appropriate repair.
- Ignition OFF, disconnect the harness connector at the steering wheel inflator module.
- With the appropriate load tool adaptor, connect J 38715-A in place of the steering wheel inflator module. See Special Tools .
- Ignition ON, with a scan tool, verify the appropriate DTC is set as current.
- If the DTC is not set or is set as history, cycle ignition OFF, disconnect the adapter and J 38715-A , reconnect the harness connector at the steering wheel inflator module, and cycle the ignition ON. See Special Tools . If the DTC resets after reconnecting the module, replace the steering wheel inflator module.
- Ignition OFF, disconnect J 38715-A and the adaptor. See Special Tools .
- Disconnect the steering wheel module coil in-line connector.
- With the appropriate load tool adaptor, connect special tool J 38715-A . See Special Tools .
- Ignition ON, with a scan tool, verify DTC is set as current.
- If DTC is not set or is set as history, replace the steering wheel module coil.
- Ignition OFF, disconnect special tool J 38715-A and the adaptor. See Special Tools .
- Disconnect the harness connector at the SDM.
- Ignition ON, test for less than 1 volt between the appropriate high circuit and ground.
- Steering wheel module coil connector Stage 1 terminal A X1
- Steering wheel module coil connector Stage 2 terminal A X2
- If not the specified range, test the circuit for a short to voltage.
- Test for less than 1 volt between the appropriate low circuit and ground.
- Steering wheel module coil connector Stage 1 terminal B X1
- Steering wheel module coil connector Stage 2 terminal B X2
- If not the specified range, test the circuit for a short to voltage.
- Ignition OFF, test for infinite resistance between the appropriate high circuit and ground.
- Steering wheel module coil connector Stage 1 terminal A X1
- Steering wheel module coil connector Stage 2 terminal A X2
- If not the specified range, test the circuit for a short to ground.
- Test for infinite resistance between the appropriate low circuit and ground.
- Steering wheel module coil connector Stage 1 terminal B X1
- Steering wheel module coil connector Stage 2 terminal B X2
- If not the specified range, test the circuit for a short to ground.
- Test for less then 1 ohm between the SDM connector and the air bag module connector high circuit.
- Steering wheel module coil connector Stage 1 terminal A X1 and SDM terminal 9
- Steering wheel module coil connector Stage 2 terminal A X2 and SDM terminal 5
- If not the specified range, test the circuit for an open/high resistance.
- Test for less then 1 ohm between the SDM connector and the air bag module connector low circuit.
- Steering wheel module coil connector Stage 1 terminal B X1 and SDM terminal 8
- Steering wheel module coil connector Stage 2 terminal B X2 and SDM terminal 4
- If not the specified range, test the circuit for an open/high resistance.
- 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.