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 MANUALSCHEVROLET2011CHEVY EXPRESS G3500, VAN CARGO EXTENDED, 6.6 LREPAIR AND DIAGNOSISELECTRICALMOTORS, SWITCHES, RELAYSWIRING SYSTEMS AND POWER MANAGEMENT - DTC DIAGNOSTICS, TROUBLESHOOTING AND CONNECTOR REPAIRDIAGNOSTIC INFORMATION AND PROCEDURESPOWER MODE MISMATCHCIRCUIT/SYSTEM TESTING
2011 Chevrolet Chevy Express G3500, Van Cargo Extended, 6.6 L
Circuit/System Testing
2011 Chevrolet Chevy Express G3500, Van Cargo Extended, 6.6 LSECTION Circuit/System Testing
NOTE:
You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.
- Connect a test lamp between each fuse test terminal of the ignition switch B+ circuit fuse and ground. The test lamp should illuminate.
- If the test lamp does not illuminate, test the circuits listed below for a short to ground. If all circuits test OK, replace the BCM.
- B+ terminal 4
- Ignition terminal 2
- Ignition terminal 3
- Ignition terminal 5
- Ignition voltage terminal BCM terminal 21, X4
- Disconnect the harness connector at the ignition switch.
- Connect a test lamp between the B+ circuit terminal 4 and ground. The test lamp should illuminate.
- If the test lamp does not illuminate, test the B+ circuit for an open/high resistance.
- Perform the ignition switch component test. Verify the switch passes the test.
- If the ignition switch does not test normal, replace the ignition switch.
- Disconnect the X 1 harness connector at the BCM, test for less than 1.0 V between the following ignition circuit terminals of the BCM and ground.
- terminal 2
- terminal 4
- terminal 14
- terminal 21
- If greater than specified, test the circuit for a short to voltage.
- Test for less than 1.0 Ξ© between the BCM and the ignition switch on the ignition circuits listed below:
- terminal 2, X1 and ignition switch terminal 5
- terminal 4, X1 and ignition switch terminal 6
- terminal 14, X1 and ignition switch terminal 2
- terminal 21, X1 and ignition switch terminal 3
- If greater than specified, test the circuit for open/high resistance
- If all circuits test normal, replace the BCM.
NOTE:
The ignition switch component test must be performed before proceeding with this test to verify the integrity of the switch.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.