Diagnostic Fault Information
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
| Low Speed GMLAN Serial Data | 1 | U0100-U02FF* | 1 | - |
| Ground (X84 Data Link Connector terminal 5) | - | 1 | - | - |
| *An open between the X84 Data Link Connector (DLC) and the first splice pack/device will only affect the communication with the scan tool. 1. No communication with any low speed GMLAN device |
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