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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 480 (Data Communications System) >> Diagnostic Information and Procedures >> Scan Tool Does Not Communicate with Low Speed GMLAN Device >> Diagnostic Fault Information

Diagnostic Fault Information

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Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
Low Speed GMLAN Serial Data (+) 1 2* 1 -
Ground (DLC, terminal 5) - 1* - -
* An open between the data link connector (DLC) and JX 200, or DLC terminal 5 ground will only effect the communication with the scan tool. See Diagnostic Aids.
1. No communication on any low speed GMLAN module
2. No communication on a specific low speed GMLAN module, or group of modules
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