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Home >> Chevrolet >> 2009 >> HHR LS, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Data Communication System >> Diagnostic Information and Procedures >> Scan Tool Does Not Communicate with Low Speed GMLAN Device >> Diagnostic Fault Information
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Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
Low speed GMLAN serial data 1 21 1 -
1 An open between the data link connector (DLC) and the splice pack 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 one or a specific group of low speed GMLAN modules