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 | ||
| Body Control Module (BCM) | • High Speed GMLAN • Low Speed GMLAN | Scan Tool Does Not Communicate with High Speed GMLAN Device and Scan Tool Does Not Communicate with Low Speed GMLAN Device |
| Digital Radio Receiver (DRR) | Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device |
| Electronic Brake Control Module (EBCM) | High Speed GMLAN | Scan Tool Does Not Communicate with High Speed GMLAN Device |
| Engine / Powertrain Control Module (ECM/PCM) | High Speed GMLAN | Scan Tool Does Not Communicate with High Speed GMLAN Device |
| Inflatable Restraint Sensing and Diagnostic Module (SDM) | Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device |
| Instrument Panel Cluster (IPC) | Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device |
| Radio | Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device |
| Remote Control Door Lock Receiver (RCDLR) | Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device |
| Theft Deterrent Module (TDM) | Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device |
| Transmission Control Module (TCM) | High Speed GMLAN | Scan Tool Does Not Communicate with High Speed GMLAN Device |
| Vehicle Communication Interface Module (VCIM) | • High Speed GMLAN - pass through only • Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device |