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 MANUALSCHEVROLET2002AVALANCHE 2500, RWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1271 (CELLULAR COMMUNICATION SYSTEM)
2002 Chevrolet Avalanche 2500, RWD
Section 1271 (Cellular Communication System)
2002 Chevrolet Avalanche 2500, RWDSECTION Section 1271 (Cellular Communication System)
WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- Specification
- Schematic and Routing Diagrams
- Component Locator
- Diagnostic Information and Procedures
- Diagnostic Starting Point-Cellular Communication
- Diagnostic System Check-Cellular Communication
- Scan Tool Data List
- Scan Tool Data Definitions
- Diagnostic Trouble Code (DTC) List
- DTC B2455: Open In Cellular Microphone Low Reference Circuit, Or Short To Voltage In Cellular Microphone Signal Circuit
- DTC B2470: VCIM Does Not Detect The Presence Of The Cellular Antenna
- DTC B2476: Keypad Signal Circuit Voltage Low
- DTC B2482: A Button Is Depressed Or Stuck For More Than 15 Seconds
- DTC B2483 or B2484: VCIM Does Not Detect A Navigation Signal
- DTC U1500: VCIM Detects An Internal Communication Malfunction
- OnStar Symptom Diagnosis
- Symptoms-Cellular Communication
- Onstar One Or More Buttons Inoperative
- Unable to Contact OnStar Call Center
- Microphone Inoperative-Caller Cannot Be Heard
- Voice Recognition Inoperative
- OnStar Steering Wheel Control Functions Inoperative
- OnStar Button LED Inoperative
- No (or Noisy) OnStar Audio
- Global Positioning System (GPS) Data Not Current or Inaccurate
- Repair Instructions
- Description and Operation
- OnStar Description and Operation
- Notes
- Vehicle Communication Interface Module (VCIM)
- Onstar® Button Assembly
- Onstar® Microphone
- Cellular and Navigation Antennas
- Onstar® Reconfiguration Procedure
- Onstar® Cellular, GPS, and Diagnostic Limitations
- Operation of the Hands Free Cellular Phone
- Operation of the Onstar® Speech Recognition Systems
- OnStar Description and Operation
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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.