Data Link References
This table identifies which serial data link that a particular module uses for in-vehicle data transmission. Some modules may use more than one data link to communicate. Some modules may have multiple communication circuits passing through them without actively communicating on that data link. This table is used to assist in correcting a communication malfunction. For the description and operation of these serial data communication circuits refer to Data Link Communications Description and Operation .
| Control Module | Data Link Type | Diagnostic Procedure |
|---|---|---|
| Schematic Reference: Data Communication Schematics | ||
| Electronic Brake Control Module (EBCM) | Class 2 | Scan Tool Does Not Communicate with Class 2 Device |
| Engine/Powertrain Control Module (ECM/PCM) | High Speed GMLAN | Scan Tool Does Not Communicate with High Speed GMLAN Device |
| Generator Battery Control Module | Class 2 | Scan Tool Does Not Communicate with Class 2 Device |
| Instrument Panel Cluster (IPC) | Class 2 | Scan Tool Does Not Communicate with Class 2 Device |
| Inflatable Restraint Sensing and Diagnostic Module (SDM) | Class 2 | Scan Tool Does Not Communicate with Class 2 Device |
| Radio | Class 2 | Scan Tool Does Not Communicate with Class 2 Device |
| Theft Deterrent Module (TDM) | Class 2 | Scan Tool Does Not Communicate with Class 2 Device |
| Transfer Case Control Module (TCCM) | Class 2 | Scan Tool Does Not Communicate with Class 2 Device |
| Transmission Control Module (TCM) | High Speed GMLAN | Scan Tool Does Not Communicate with Class 2 Device |
| Vehicle Communication Interface Module (VCIM) (OnStar®), w/UE1 | Class 2 | Scan Tool Does Not Communicate with Class 2 Device |