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
Audio Amplifier	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
Automatic Forward Lighting System (AFS) Module	High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
Auxiliary Body Control Module (XBCM)	High Speed GMLAN Low Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
Body Control Module (BCM)	High Speed GMLAN Low Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
Driver Door Module (DDM)	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
Driver Position (Memory Seat) Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
Electronic Brake Control Module (EBCM)	High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
Electronic Park Brake Control Module	High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
Electronic Suspension Control (ESC) Module	High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
Engine Control Module (ECM)	High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
Fuel System Control Module (FSCM)	High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
HVAC Control Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
Inflatable Restraint Sensing and Diagnostic Module (SDM)	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
Inflatable Restraint Passenger Presence System (PPS)	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
Instrument Panel Cluster (IPC)	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
Passenger Door Module (PDM)	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
Pedestrian Impact Detection System (PIDS) Module	High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
Radio	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
Radio HVAC Control Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
Rear Park Assist (RPA) Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
Remote Control Door Lock Receiver	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
Theft Deterrent Alarm	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
Theft Deterrent Control Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
Transfer Case Control Module	High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
Transmission Control Module	High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
TV Antenna Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
Vehicle Control Interface Module (VCIM)	High Speed GMLAN Low Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device