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 MANUALSCHEVROLET2025TAHOE COMMERCIAL, 4WDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMDATA COMMUNICATIONS - DIAGNOSTIC INFORMATION AND PROCEDURES (1 OF 4)DIAGNOSTIC INFORMATION AND PROCEDURESDTC B1A21 (K299R AUDIO/VIDEO INTERFACE REAR MODULE)CIRCUIT/SYSTEM DESCRIPTION
2025 Chevrolet Tahoe Commercial, 4WD
Circuit/System Description
2025 Chevrolet Tahoe Commercial, 4WDSECTION Circuit/System Description
The Ethernet bus 5 is used to communicate between the A11 Radio and the K299R Audio/Video Interface Rear Module. This Ethernet harness consists of a single twisted pair of copper wires (circuits 7212 & 7213) from point to point.
RENDER: 1.0x
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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.