Reference Information

Schematic Reference

OnStar/Telematics Wiring Schematics 

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

OnStar Description and Operation (without UI3) OnStar Description and Operation (UI3) 

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