Cellular Communication System
- 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 Navigational Signal
- DTC B2476: Keypad Low Reference Circuit Voltage
- DTC U1500: No Communication Between VIU And VCU
- Symptoms - Cellular Communication
- OnStar® One Or More Buttons Inoperative
- OnStar® Cannot Control Horns, Door Unlock Or Exterior Lamps
- 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
- OnStar® Reprogramming
- Repair Instructions
- Description & Operation