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 MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 704 (CELLULAR COMMUNICATION SYSTEM)
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Section 704 (Cellular Communication System)
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Section 704 (Cellular Communication System)
WARNING: This page is about a different car, the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- Specifications
- Schematic & Routing Diagrams
- Component Locator
- Diagnostic Information & 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 B2462: VIU Does Not Detect A Navigation Signal
- DTC B2476: Keypad Signal Circuit Voltage To VIU Is Low
- DTC U1500: VIU To VCU Communication Error
- OnStar® Symptom Diagnosis
- Symptoms - Cellular Communication
- OnStar® Always On
- OnStar® One Or More Buttons Inoperative
- Unable To Contact OnStar® Call Center
- OnStar® Call Center Unable To Configure OnStar® System
- Microphone Inoperative - Caller Cannot Be Heard
- Voice Recognition Inoperative
- OnStar® Button LED Inoperative
- No (or Noisy) OnStar® Audio
- Global Positioning System (GPS) Data Not Current Or Inaccurate
- OnStar® Battery Consumption Test
- OnStar® Reprogramming
- Repair Instructions
- Coaxial Cable Replacement - Cellular Telephone
- Coaxial Cable Replacement - Global Positioning System (GPS)
- OnStar® Cellular Antenna Replacement
- Antenna Assembly Replacement - Cellular & Navigation
- Vehicle Locating Antenna Ground Plate Replacement
- Navigation Antenna Replacement
- OnStar® Button Assembly Replacement (Pickup)
- OnStar® Vehicle Communication Unit (VCU) Replacement
- OnStar® Vehicle Interface Unit (VIU) Replacement
- OnStar® Microphone Replacement
- Description & 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.