Data Link References

WARNING: This page is about a different car, the 2008 Chevrolet Malibu Classic. However, it is still accessible from the selected car via links, so may be relevant.

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)	High Speed GMLAN Low Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device and Scan Tool Does Not Communicate with Low Speed GMLAN Device (Buss 1) or Scan Tool Does Not Communicate with Low Speed GMLAN Device (Buss 2)
Digital Radio Receiver (DRR)	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device (Buss 1) or Scan Tool Does Not Communicate with Low Speed GMLAN Device (Buss 2)
Electronic Brake Control Module (EBCM)	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
HVAC Control Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device (Buss 1) or Scan Tool Does Not Communicate with Low Speed GMLAN Device (Buss 2)
Instrument Panel Cluster (IPC)	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device (Buss 1) or Scan Tool Does Not Communicate with Low Speed GMLAN Device (Buss 2)
Inflatable Restraint Sensing and Diagnostic Module (SDM)	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device (Buss 1) or Scan Tool Does Not Communicate with Low Speed GMLAN Device (Buss 2)
Power Steering Control Module (PSCM)	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 (Buss 1) or Scan Tool Does Not Communicate with Low Speed GMLAN Device (Buss 2)
Remote Playback Device - CD Player (CDX)	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device (Buss 1) or Scan Tool Does Not Communicate with Low Speed GMLAN Device (Buss 2)
Theft Deterrent Module (TDM)	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device (Buss 1) or Scan Tool Does Not Communicate with Low Speed GMLAN Device (Buss 2)
Transmission Control Module (TCM) Automatic Only	High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
Vehicle Communication Interface Module (VCIM)	High Speed GMLAN - pass through only Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device (Buss 1) or Scan Tool Does Not Communicate with Low Speed GMLAN Device (Buss 2)