Diagnostic Fault Information
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
| B+ | U1803 | U1803 | - | - |
| Ignition | U1803 | U1803 | - | - |
| Accessory Wakeup Serial Data | U1814 | U1803 | - | - |
| Low Speed GMLAN Serial Data | 1 | U1803 | 1 | - |
| High Speed GMLAN Serial Data (+) | 2 | U1803, U0073 | 2 | - |
| High Speed GMLAN Serial Data (-) | 2 | U1803, U0073 | 2 | - |
| Powertrain High Speed GMLAN Serial Data (+) | U0074 | U1803, U0074 | U0074 | - |
| Powertrain High Speed GMLAN Serial Data (-) | U0074 | U1803, U0074 | U0074 | - |
| High Voltage Energy Management High Speed GMLAN Serial Data (+) | U007A | U1803, U007A | U007A | - |
| High Voltage Energy Management High Speed GMLAN Serial Data (-) | U007A | U1803, U007A | U007A | - |
| Ground | - | U1803 | - | - |
| 1. Scan Tool Does Not Communicate With Low Speed GMLAN Device 2. Scan Tool Does Not Communicate With High Speed GMLAN Device |
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