Reference Information

Schematic Reference

Radio/Navigation System Wiring Schematics (IOR) , or Radio/Navigation System Wiring Schematics (IOS/IOT) 

Connector End View Reference

Master Electrical Component List , or Component Connector End Views - Index

Description and Operation

Radio/Audio System Description and Operation 

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  GM OnStar Antenna Diagnostic Tool Kit