Reference Information

Schematic Reference

• OnStar/Telematics Schematics (Buick) OnStar/Telematics Schematics (Chevrolet) 
• Radio/Navigation System Schematics (Buick) Radio/Navigation System Schematics (Chevrolet) 

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX (ENCORE)COMPONENT CONNECTOR END VIEWS - INDEX (TRAX)

Description and Operation

• OnStar Description and Operation 
• Radio/Audio System Description and Operation (with IO5/IO6) Radio/Audio System Description and Operation (with IOA/IP1) 

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