LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Hummer >> 2009 >> H3 Alpha >> Repair and Diagnosis >> External Pages >> Different car >> Section 263 (Data Communications System) >> Diagnostic Information and Procedures >> DTC U1821 >> Reference Information
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Reference Information

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2011 GMC Yukon XL, 2011 GMC Yukon, 2011 Chevrolet Tahoe, 2011 Chevrolet Suburban, and 2011 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

Schematic Reference

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Data Link Communications Description and Operation 

Electrical Information Reference

Special Tools

EL-48900 HEV Safety Kit