Diagnostic Fault Information
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
| Ground (DLC, terminal 5) | - | 1 | - | - |
| Mid Speed GMLAN Serial Data (+) | U0074 | U0074, 2* | U0074 | - |
| Mid Speed GMLAN Serial Data (-) | U0074 | U0074, 2* | U0074 | - |
| Chassis High Speed GMLAN Serial Data (+) | U0074 | U0074, 2* | U0074 | - |
| Chassis High Speed GMLAN Serial Data (-) | U0074 | U0074, 2* | U0074 | - |
| * 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 or chassis high speed GMLAN module. 2. 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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