Cellular Communication System

• Specifications
  • Fastener Tightening Specifications
• Schematic and Routing Diagrams
  • OnStar Schematics (OnStar Power and Grounds)
• Component Locator
  • Cellular Communication Component Views
  • Cellular Communication Connector End Views
• Diagnostic Information and Procedures
  • Diagnostic Starting Point - Cellular Communication
  • Diagnostic System Check - Cellular Communication
    • Test Description
  • Scan Tool Data List
  • Scan Tool Data Definitions
  • Diagnostic Trouble Code (DTC) List
  • DTC B2462: No Navigation Signal
    • Circuit Description
    • Conditions for Running the DTC
    • Conditions for Setting the DTC
    • Action Taken When the DTC Sets
    • Conditions for Clearing the DTC
    • Test Description
  • DTC B2476: Low Reference Circuit Voltage To The VIU Low
    • Circuit Description
    • Conditions for Setting the DTC
    • Action Taken When the DTC Sets
    • Conditions for Clearing the DTC
    • Test Description
  • DTC U1500: No Communication Between The VIU And The VCU
    • Circuit Description
    • Conditions for Setting the DTC
    • Action Taken When the DTC Sets
    • Conditions for Clearing the DTC
    • Test Description
  • Symptoms - Cellular Communication
    • Notes
    • Visual/Physical Inspection
    • Intermittent
    • Symptom List
  • 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 (R) System
  • Microphone Inoperative - Caller Cannot Be Heard
  • Voice Recognition Inoperative
  • OnStar Button LED Inoperative
    • Test Description
  • No (or Noisy) OnStar Audio
    • No or Noisy OnStar Audio
  • OnStar Reprogramming
    • OnStar® Module Reprogramming
    • Vehicle Interface Unit (VIU)
    • Vehicle Communication Unit (VCU)
• Repair Instructions
  • Coaxial Cable Replacement - Cellular Telephone
    • Notes
    • Removal Procedure
    • Installation Procedure
  • OnStar Cellular Antenna Replacement
    • Notes
    • Removal Procedure
    • Installation Procedure
  • Navigation Antenna Replacement
    • Notes
    • Removal Procedure
    • Installation Procedure
  • OnStar Button Assembly Replacement
    • Removal Procedure
    • Installation Procedure
  • OnStar Vehicle Communication Unit (VCU) Replacement
    • Notes
    • Removal Procedure
    • Installation Procedure
  • OnStar Vehicle Interface Unit (VIU) Replacement
    • Notes
    • Removal Procedure
    • Installation Procedure
  • OnStar Microphone Replacement
    • Notes
    • Removal Procedure
    • Installation Procedure
• Description and Operation
  • OnStar Description and Operation
    • Notes
    • OnStar® Button Assembly
    • OnStar® Microphone
    • Vehicle Interface Unit (VIU)
    • Vehicle Communication Unit (VCU)
    • Operation of the Hands Free Cellular Phone
    • Operation of the OnStar® Speech Recognition Systems