Section 539 (Data Link Communication System)
WARNING: This page is about a different car, the 2002 GMC Savana Special, 2002 GMC Savana Camper Special, 2002 GMC Savana, and 2002 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.
- Wiring Diagrams
- Component Locator
- Diagnostic Information and Procedures
- Diagnostic Starting Point - Data Link Communications
- DTC U1000 and U1255: Critical Operating Parameter Has Not Been Associated
- DTC U1001 to U1254: Module U1XXX Communication
- DTC U1300, U1301, or U1305: Class 2 Serial Data Circuit
- Symptoms - Data Link Communications
- Scan Tool Does Not Power Up
- Scan Tool Does Not Communicate with Class 2 Device
- Scan Tool Does Not Communicate with EBCM
- Description and Operation