Diagnostic Fault Information
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
| B+ | U179A | U179A | - | - |
| Ignition | U179A | U179A | - | - |
| Wake-Up Signal | U1814, U2099 | U179A | - | - |
| Low Speed GMLAN Serial Data | 1 | U179A | 1 | - |
| High Speed GMLAN Serial Data (+) | 2 | U179A | 2 | - |
| High Speed GMLAN Serial Data (-) | 2 | U179A | 2 | - |
| Powertrain High Speed GMLAN Serial Data (+) | 3 | U179A | 3 | - |
| Powertrain High Speed GMLAN Serial Data (-) | 3 | U179A | 3 | - |
| High Voltage Energy High Speed GMLAN Serial Data (+) | 4 | U179A | 4 | - |
| High Voltage Energy High Speed GMLAN Serial Data (-) | 4 | U179A | 4 | - |
| Ground | - | U179A | - | - |
| 1. Scan Tool Does Not Communicate With Low Speed GMLAN Device 2. Scan Tool Does Not Communicate With High Speed GMLAN Device 3. Scan Tool Does Not Communicate With Powertrain High Speed GMLAN Device 4. Scan Tool Does Not Communicate With High Voltage Energy High Speed GMLAN Device |
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