LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Cadillac >> 2009 >> XLR Base >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Data Communication System >> Diagnostic Information and Procedures >> Scan Tool Does Not Communicate with Class 2 Device >> Diagnostic Fault Information
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
Class 2 Serial Data 1 U1001-U1254 1 -
Ground (DLC, terminal 5) - 1* - -
* An open in the DLC ground circuit terminal 5 will only effect the communication with the scan tool. The vehicle modules will still communicate.
1. No communication on any class 2 serial data module