Reference Information

Schematic Reference

• OnStar/Telematics Schematics 
• Radio/Navigation System Schematics (IO3) , Radio/Navigation System Schematics (IO5 or IO6) 

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

• OnStar Description and Operation 
• Radio/Audio System Description and Operation (IO3) , Radio/Audio System Description and Operation (IO5/IO6) 

Electrical Information Reference

• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Special Tools

EL-49903  OnStar Antenna Diagnostic Tool Kit