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) | Class 2 | Scan Tool Does Not Communicate with Class 2 Device |
| Content Theft Deterrent Module (w/ BAE) | Class 2 | Scan Tool Does Not Communicate with Class 2 Device |
| Digital Radio Receiver (DRR) | Class 2 | Scan Tool Does Not Communicate with Class 2 Device |
| Electronic Brake Control Module (EBCM) | Class 2 | Scan Tool Does Not Communicate with Class 2 Device |
| Engine Control Module (ECM) |
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| Fuel System Control Module (FPCM) | High Speed GM LAN | Scan Tool Does Not Communicate with High Speed GMLAN Device |
| Inflatable Restraint Sensing and Diagnostic Module (SDM) | 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 |
| Radio | Class 2 | Scan Tool Does Not Communicate with Class 2 Device |
| Regulated Voltage Control Module | Class 2 | Scan Tool Does Not Communicate with Class 2 Device |
| Theft Deterrent Module (TDM/PK3) | 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 GM Lan | Scan Tool Does Not Communicate with High Speed GMLAN Device |
| Vehicle Communication Interface Module (OnStar® VCIM) | Class 2 | Scan Tool Does Not Communicate with Class 2 Device |