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 | ||||||
Audio Amplifier | Low Speed GMLAN | |||||
Automatic Occupant Sensing (PPS) | Low Speed GMLAN | |||||
Body Control Module (BCM) |
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Digital Radio Receiver (DRR) | Low Speed GMLAN | |||||
Driver Door Module (DDM) | Low Speed GMLAN | |||||
Driver Position Module (MSM) | Low Speed GMLAN | |||||
Electronic Brake Control Module (EBCM) | High Speed GMLAN | |||||
Electronic Suspension Control (ESC or MRRTD) Module | High Speed GMLAN | |||||
Engine / Powertrain Control Module (ECM/PCM) | High Speed GMLAN | |||||
Export Body Control Module (XBCM) | Low Speed GMLAN | |||||
Headlamp Leveling Control Module (HCM) w/ TR7 | Keyword 2000 | Dedicated data line from terminal 7 of the DLC to the HCM | ||||
Heated Seat Module (HSM) | 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 Door Module (PDM) | Low Speed GMLAN | |||||
Power Liftgate Module (PLGM) | Low Speed GMLAN | |||||
Radio | Low Speed GMLAN | |||||
Rear Seat Audio (RSA) Module | Low Speed GMLAN | |||||
Rear Seat Module (RSM) | Low Speed GMLAN | |||||
Remote Control Door Lock Receiver (RCDLR) | Low Speed GMLAN | |||||
Rollover Sensor (ROS) | Low Speed GMLAN | |||||
Theft Deterrent Module (TDM) | Low Speed GMLAN | |||||
Transmission Control Module (TCM) | High Speed GMLAN | |||||
Universal Park Assist (UPA) Module | Low Speed GMLAN | |||||
Vehicle Communication Interface Module (OnStar VCIM) |
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