Diagnostic Fault Information
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
| Module B+ | U1128 | U1128 | - | - |
| Module Ignition | U1128 | U1128 | - | - |
| Serial Data Communication Enable | U2099 | U1128 | - | - |
| High Speed GMLAN Serial Data (+) | 1 | U1128 | 1 | - |
| High Speed GMLAN Serial Data (-) | 1 | U1128 | 1 | - |
| Module Ground | - | U1128 | - | - |
| 1. Scan tool does not communicate with high speed GMLAN device | ||||