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 DIAGNOSISELECTRICALGAUGESINSTRUMENT PANEL SYSTEM DISPLAYS & GAGESDIAGNOSTIC INFORMATION AND PROCEDURESDRIVER INFORMATION CENTER (DIC) SWITCH INOPERATIVECIRCUIT/SYSTEM TESTING
2008 Chevrolet Chevy Express G3500, Van Passenger Extended
Circuit/System Testing
2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the DIC switch assembly.
- Ignition OFF, test for less than 1 ohm of resistance between the ground circuit terminal 2 and ground.
- If greater than 1 ohm, test the ground circuit for an open/high resistance.
- Ignition ON, verify all of the scan tool DIC Switch parameters are Inactive.
- If any are not Inactive, test the signal circuit for a short to ground. If the circuit tests normal, replace the IPC.
- Ignition ON, install a 3-amp fused jumper wire between the signal circuits terminal 1, terminal 3 and ground. Verify all of the scan tool DIC Switch parameters are Active.
- If any are not Active, test the signal circuits for a short to voltage or an open/high resistance. If the circuit tests normal, replace the IPC.
- If all the circuits test normal, test or replace the DIC switch assembly.
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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.