Diagnostic Fault Information
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
| Battery Positive Voltage (B+) | 1 | 1 | - | - |
| Ground (DLC, terminal 5) | - | 1 | - | - |
| Mid Speed GMLAN Serial Data (+) | 1 | U0074 00, 3* | 1 | - |
| Mid Speed GMLAN Serial Data (-) | 1 | U0074 00, 3* | 1 | - |
| Chassis High Speed GMLAN Serial Data (+) | 2 | U0074 00, 3* | U0074 00, 2 | - |
| Chassis High Speed GMLAN Serial Data (-) | 2 | U0074 00, 3* | U0074 00, 2 | - |
| * An open between the data link connector (DLC) and the first splice will only effect the communication with the scan tool. The vehicle control modules will still communicate. 1. No communication on any mid speed GMLAN module. 2. No communication on any chassis high speed GMLAN module. 3. An open in only one mid speed or chassis high speed GMLAN serial data circuit may allow degraded communication between the controls modules. |
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