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 1409 (CELLULAR SYSTEM, ENTERTAINMENT SYSTEM, AND NAVIGATION SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESONSTAR ONE OR MORE BUTTONS INOPERATIVECIRCUIT/SYSTEM TESTING (ALL BUTTONS INOPERATIVE)
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6
Circuit/System Testing (All Buttons Inoperative)
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Circuit/System Testing (All Buttons Inoperative)
WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the harness connector at the inside rearview mirror.
- Ignition ON, test for 9.8-10.2 volts between the keypad supply voltage circuit terminal 12 and ground.
- If less or more than the specified value, repair short to ground, open or replace the VCIM.
- Ignition OFF, reconnect the harness connector at the inside rearview mirror.
- Disconnect the X1 VCIM harness connector.
- Test for 500 to 20K ohms of resistance between X1 VCIM harness connector terminal 6 and 11 when each of the keypad button is pressed.
- If resistance is within the specified value when any of the keys are pressed replace the VCIM.
- Disconnect the harness connector at the inside rearview mirror.
- Test for infinite resistance between the inside rearview mirror connector terminal 11 and ground.
- If less than infinite resistance repair short to ground on the keypad signal circuit.
- Test for less than 1 ohm between the X1 VCIM connector terminal 11 and the inside rearview mirror connector terminal 11.
- If more than the specified value repair open or high resistance on the keypad signal circuit.
- If all circuits test normal, replace the keypad.
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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.