Diagnostic Fault Information
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
| B+ | U18AD | U18AD | - | - |
| Ignition | U18AD | U18AD | - | - |
| Serial Data Communication Enable | U1814, U2099 | U18AD | - | - |
| Chassis High Speed GMLAN Serial Data (+) | U0077* | U0077, U18AD* | U0077* | - |
| Chassis High Speed GMLAN Serial Data (-) | U0077* | U0077, U18AD* | U0077* | - |
| Ground | - | U18AD | - | - |
| * Other DTCs may set with this fault. | ||||