Reference Information

Schematic Reference

OnStar/Telematics Wiring Schematics 

Connector End View Reference

Master Electrical Component List , or Component Connector End Views - Index

Description and Operation

OnStar Description and Operation (without IOU/IOT/IOR) , or OnStar Description and Operation (IOU/IOT/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