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 | |||||
Content Theft Deterrent Module (w/ BAE) | Class 2 | |||||
Digital Radio Receiver (DRR) | Class 2 | |||||
Electronic Brake Control Module (EBCM) | Class 2 | |||||
Engine Control Module (ECM) |
| |||||
Fuel System Control Module (FPCM) | High Speed GM LAN | |||||
Inflatable Restraint Sensing and Diagnostic Module (SDM) | Class 2 | |||||
Instrument Panel Cluster (IPC) | Class 2 | |||||
Radio | Class 2 | |||||
Regulated Voltage Control Module | Class 2 | |||||
Theft Deterrent Module (TDM/PK3) | Class 2 | |||||
Transfer Case Control Module (TCCM) | Class 2 | |||||
Transmission Control Module (TCM) | High Speed GM Lan | |||||
Vehicle Communication Interface Module (OnStar® VCIM) | Class 2 | |||||
