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 1304 (CELLULAR SYSTEM, ENTERTAINMENT SYSTEM, AND NAVIGATION SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESNAVIGATION SYSTEM - VOICE RECOGNITION INOPERATIVECIRCUIT/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 is about a different car, the 2008 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.
North American
- Ignition OFF, disconnect the X3 harness connector at the VCIM.
- Ignition ON, test for 8.5-9.5 volts between the navigation voice signal circuit terminal 2 and ground.
- If less than specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the radio.
- If greater than specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the radio.
- Ignition OFF, test for less than 10 ohms between the navigation voice low reference circuit terminal 4 and ground.
- If greater than the specified range, test the low reference circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the radio.
- Ignition ON, test for 8.5-9.5 volts between the navigation voice signal circuit terminal 2 and the drain wire circuit terminal 5.
- If less than specified range, test the drain wire circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the radio.
- Ignition OFF, disconnect the X1 harness connector at the radio.
- Verify that a test lamp does not illuminate between B+ and the navigation voice low reference circuit terminal 5.
- If the test lamp illuminates, test the low reference circuit for a short to ground.
- If all circuits test normal, replace the VCIM.
European
- Ignition OFF, disconnect the harness connector at the inside rearview mirror.
- Ignition ON, test for 8.5-9.5 volts between the cellular microphone signal circuit terminal 10 and ground.
- If less than specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the radio.
- If greater than specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the radio.
- Ignition ON, test for 8.5-9.5 volts between the cellular microphone signal circuit terminal 10 and the drain wire circuit terminal 2.
- If less than specified range, test the drain wire circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the radio.
- If all circuits test normal, replace the inside rearview mirror 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.