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Home >> Cadillac >> 2007 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 1353 (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

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. 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 2* 1 -
Ground (DLC, terminal 5) - 1* - -
* An open between the data link connector (DLC) and JX 221, 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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