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Home >> Hummer >> 2008 >> H3 Base, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 174 (Data Communication System) >> Diagnostic Information and Procedures >> Scan Tool Does Not Communicate with Low Speed GMLAN Device >> Diagnostic Fault Information

Diagnostic Fault Information

WARNING: This page is about a different car, the 2008 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.
Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
Low Speed GMLAN Serial Data 1 21 1 -
Ground (DLC, terminal 5) - 1 - -
1 An open between the data link connector (DLC) and X 3, or DLC pin 5 ground will only effect the communication with the scan tool. The vehicle modules will still communicate.
  1. No communication on any low speed GMLAN module
  2. No communication on a specific low speed GMLAN module
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