Reference Information

Schematic Reference

OnStar/Telematics Schematics 

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

OnStar Description and Operation (with EF7 or Z49) OnStar Description and Operation (without EF7 or Z49) 

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