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 MANUALSCHEVROLET2006SUBURBAN K2500, 6.0 UREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 898 (CELLULAR SYSTEM, ENTERTAINMENT SYSTEM, AND NAVIGATION SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC B1288CIRCUIT/SYSTEM TESTING
2006 Chevrolet Suburban K2500, 6.0 U
Circuit/System Testing
2006 Chevrolet Suburban K2500, 6.0 USECTION Circuit/System Testing
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Chevrolet Tahoe, 2007 Chevrolet Suburban, and 2007 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
Without Third Row Display
- Ignition OFF, disconnect the harness connector of the rear video display. Ignition ON, with a DMM verify there is 100 to 300 Hz on the video display mode control signal circuit.
- If 100 to 300 Hz is not present on the video display mode signal circuit test for an open, a short to voltage, or a short to ground. If the video display mode signal circuit tests normal, replace the radio.
- If 100 to 300 Hz is present and the video display mode signal circuit tests normal, replace the rear video display.
With Third Row Display
- With a scan tool clear the DTC. Ignition OFF, Disconnect the third row video display. Ignition ON, verify the DTC resets.
- If the DTC does not reset, replace the third row video display.
- Ignition OFF, disconnect the harness connector of the rear video display. Ignition ON, with a DMM verify there is 100 to 300 Hz on the video display mode control signal circuit.
- If 100 to 300 Hz is present and the video display mode signal circuit tests normal, replace the front rear video display.
- If 100 to 300 Hz is not present on the video display mode signal circuit test for an open, a short to voltage, or a short to ground. If the video display mode signal circuit tests normal, replace the radio.
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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.