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 MANUALSCHEVROLET2001C3500 HD 8.1 G, AUTOMATICREPAIR AND DIAGNOSISACCESSORIES & EQUIPMENTENTERTAINMENT SYSTEMSCELLULAR COMMUNICATION SYSTEM
2001 Chevrolet C3500 HD 8.1 G, Automatic
Cellular Communication System
2001 Chevrolet C3500 HD 8.1 G, AutomaticSECTION Cellular Communication System
- Specifications
- Schematic Wiring 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 Code Index
- Diagnostic Trouble Code (DTC) List
- DTC B2462
- DTC B2476
- DTC U1500
- OnStar Symptom Diagnosis
- Symptoms - Cellular Communication
- OnStar Always On
- OnStar Button Malfunction
- OnStar Call Center Remote Function Requests Malfunction
- Unable to Contact OnStar Call Center
- OnStar Call Center Unable to Configure OnStar (R) System
- OnStar Microphone Malfunction
- OnStar Voice Recognition Malfunction
- OnStar Button LED Malfunction
- OnStar Audio Malfunction
- OnStar Global Positioning System (GPS) Data Not Current or Inaccurate
- OnStar Battery Consumption Test
- OnStar Reconfiguration (Without TIS 2 Web Gen.3 and prior)
- Repair Instructions
- Mobile Telephone Antenna Replacement (Utility)
- Mobile Telephone Antenna Replacement (Pick-Up)
- Vehicle Location Antenna Ground Plate Replacement
- OnStar GPS Antenna Replacement (Retained By Bracket)
- OnStar Button Assembly Replacement (Utility)
- OnStar Button Assembly Replacement (Pick-Up)
- OnStar Vehicle Communication Unit Replacement
- OnStar Vehicle Interface Unit Replacement
- Mobile Telephone Microphone Replacement
- Description and Operation
- OnStar Description and Operation
- Notes
- OnStar® Button Assembly
- OnStar® Microphone
- Vehicle Interface Unit (VIU)
- Vehicle Communication Unit (VCU)
- Cellular and GPS Antennas
- OnStar Sleep Cycle
- Deactivated OnStar® Accounts
- OnStar® Reconfiguration Procedure
- OnStar® Cellular, GPS, and Diagnostic Limitations
- OnStar® Personal Calling
- Operation of the Hands Free Cellular Phone
- OPC Features
- Voice Feedback
- OPC Security/System Lock
- Nametags
- Mobile Identification Number and Mobile Directory Number
- 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.