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 MANUALSCHEVROLET2009TAHOE BASE, 4.8 CREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 222 (CELLULAR SYSTEMS, ENTERTAINMENT SYSTEMS & NAVIGATION SYSTEMS)DIAGNOSTIC INFORMATION AND PROCEDURESVIDEO DISPLAY MALFUNCTIONCIRCUIT/SYSTEM TESTING
2009 Chevrolet Tahoe Base, 4.8 C
Circuit/System Testing
2009 Chevrolet Tahoe Base, 4.8 CSECTION Circuit/System Testing
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2010 GMC Yukon XL, 2010 GMC Yukon, 2010 Chevrolet Tahoe, 2010 Chevrolet Suburban, and 2010 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the harness connector at the appropriate DVD display.
- Ignition OFF, test for less than 5.0 ohms between the ground circuit terminals listed below and ground.
- Ground terminal 6
- Ground terminal 5 (DNU)
- If greater than specified range, test the ground circuit for an open/high resistance.
- Ignition ON, DVD playing, test for B+ between the entertainment remote enable B+ circuit terminal 8 and ground.
- If less than specified value, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the radio.
- Ignition ON, test for B+ between the battery positive voltage circuit terminal 7 and ground.
- If less than specified value, test the voltage supply circuit for a short to ground or an open/high resistance.
- Ignition ON, DVD playing, test for 1-8 volts between the video bright control circuit terminal 9, and ground.
- If greater then specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the radio.
- If less then specified range, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the radio.
- Ignition ON, DVD playing, test for 0.1-3.0 volts between the video mode signal circuit terminal 10, and ground.
- If greater then specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the radio.
- If less then specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the radio.
- Ignition ON, DVD playing, test for 1-3 volts between the video signal (+) circuit terminal 1, and ground.
- If greater then specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the radio.
- If less then specified range, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the radio.
- If all circuits test normal, replace the DVD display.
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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.