Reference Information
Schematic Reference
Connector End View Reference
Component Connector End Views -- Index
Description and Operation
OnStar Description and Operation
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. See Special Tools .