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) |
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Digital Radio Receiver (DRR), w/U2K | Low Speed GMLAN | |||||
Electronic Brake Control Module (EBCM) | High Speed GMLAN | |||||
Engine/Powertrain Control Module (ECM/PCM) | High Speed GMLAN | |||||
Heated/Vented Seat Module (HVSM) | Low Speed GMLAN | |||||
HVAC Control Module | Low Speed GMLAN | |||||
Instrument Panel Cluster (IPC) | Low Speed GMLAN | |||||
Inflatable Restraint Sensing and Diagnostic Module (SDM) | Low Speed GMLAN | |||||
Passenger Presence System (PPS) | Low Speed GMLAN | |||||
Power Steering Control Module (PSCM) | High Speed GMLAN | |||||
Radio | Low Speed GMLAN | |||||
Rear Differential Clutch Control Module (Transfer Case Control Module) | High Speed GMLAN | |||||
Rear Seat Audio (RSA) Module | Low Speed GMLAN | |||||
Remote Function Actuator (RFA) | Low Speed GMLAN | |||||
Rollover Sensor (ROS) | Low Speed GMLAN | |||||
Theft Deterrent Module (TDM) | Low Speed GMLAN | |||||
Transmission Control Module (TCM) | High Speed GMLAN | |||||
Vehicle Communication Interface Module (VCIM) (OnStar), w/UE1 |
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