Reference Information

Schematic Reference

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

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX (Encore)COMPONENT CONNECTOR END VIEWS - INDEX (Trax)

Description and Operation

• OnStar Description and Operation (UE1 without IOR)OnStar Description and Operation (UE1 with IOR)
• Radio/Audio System Description and Operation (IOB)Radio/Audio System Description and Operation (IOS/IOT/IOU)Radio/Audio System Description and Operation (IOR)

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