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Home >> Cadillac >> 2017 >> XT5 Base >> Repair and Diagnosis >> Engine Performance >> System >> Data Communication System - Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> Scan Tool Does Not Communicate with High 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
High Speed GMLAN Serial Data (+) 1 U0100 - U02FF* 1 -
High Speed GMLAN Serial Data (-) 1 U0100 - U02FF* 1 -
Ground (X84 Data Link Connector terminal 5) - 1 - -
* No communications with one or more high speed GMLAN devices. An open in only one high speed GMLAN serial data circuit may allow degraded communication between the devices. An open between the X84 Data Link Connector (DLC) and the first splice/device will only affect the communication with the scan tool. The devices will still communicate.
1. No communication with any high speed GMLAN device