Reference Information

Schematic Reference

• OnStar/Telematics Schematics (Encore) OnStar/Telematics Schematics (Trax) 
• Radio/Navigation System Schematics (Encore) Radio/Navigation System Schematics (Trax) 

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 Monochrome Display) Radio/Audio System Description and Operation (with Color Display) 

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