Reference Information

WARNING: This page is about a different car, the 2018 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.

Schematic Reference

OnStar/Telematics Wiring Schematics
Radio/Navigation System Wiring Schematics (IOS/IOT)Radio/Navigation System Wiring Schematics (IO6)

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

OnStar Description and Operation (UE1 without IOS/IOT)OnStar Description and Operation (UI3)OnStar Description and Operation (UE1 with IOS/IOT)

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