Reference Information

WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.

Schematic Reference

OnStar/Telematics Schematics
Radio/Navigation System Schematics (IO3)Radio/Navigation System Schematics (IO5 or IO6)

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

OnStar Description and Operation (UE1)OnStar Description and Operation (UI3)
Radio/Audio System Description and Operation (IO5/IO6)Radio/Audio System Description and Operation (IO3)

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