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 - POOR OR INOPERATIVE TV RECEPTIONCIRCUIT/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.
IMPORTANT:
Verify the auxiliary audio or video input device is operating normally before performing this diagnostic.
- Inspect the TV antenna grid for damage and that each of the TV antennas are connected.
- If damage is found, replace the rear glass.
- Ignition OFF, disconnect the antenna coaxial cable from the TV antenna module.
- Verify there is less than 3.5 ohms between each of the TV antenna end coaxial cable center conductor and the TV antenna amplifier end coaxial cable center conductor.
- If greater than specified value, replace the TV antenna coaxial cable.
- Test each of the following circuits for an open, short to ground, or a short to voltage.
- The video red signal circuits
- The video green signal circuits
- The video blue signal circuits
- The video synchronization signal circuits
- The audio left circuit
- The audio right circuit
- The audio common circuit
- If an open, short to ground, or a short to voltage is found repair the suspect circuit.
- If all circuits test normal replace the TV antenna module.
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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.