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) |
| 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 | |||||
Electronic Brake Control Module (EBCM) | High Speed GMLAN | |||||
Engine Control Module (ECM) L61 | High Speed GMLAN | |||||
Instrument Panel Cluster (IPC) | Low Speed GMLAN | |||||
Inflatable Restraint Sensing and Diagnostic Module (SDM) | Low Speed GMLAN | |||||
Power Steering Control Module (PSCM) | High Speed GMLAN | |||||
Powertrain Control Module (PCM) LSJ |
| Scan Tool Does Not Communicate with High Speed GMLAN Device for communications malfunctions or Scan Tool Does Not Communicate with Class 2 Device for SPS malfunctions | ||||
Radio | Low Speed GMLAN | |||||
Transmission Control Module (TCM) NM5 | High Speed GMLAN | |||||
Vehicle Communication Interface Module (VCIM) |
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