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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 
Automatic Level Control (ALCM) Module High Speed GMLAN Scan Tool Does Not Communicate with High Speed GMLAN Device 
Audio Amplifier Low Speed GMLAN Scan Tool Does Not Communicate with Low Speed GMLAN Device 
Body Control Module (BCM)
  • High Speed GMLAN
  • Low Speed GMLAN
 Scan Tool Does Not Communicate with High Speed GMLAN Device 
Climate Control Seat Module (CCSM) w/KB6 Keyword 2000 Scan Tool Does Not Communicate with Keyword Data Line 
Digital Radio Receiver (DRR) Module Low Speed GMLAN Scan Tool Does Not Communicate with Low 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 Suspension Control (ESC) Module High Speed GMLAN Scan Tool Does Not Communicate with High Speed GMLAN Device 
Engine/Powertrain Control Module (ECM/PCM) High Speed GMLAN Scan Tool Does Not Communicate with High Speed GMLAN Device 
Front Passenger Door Module (FPDM) Low Speed GMLAN Scan Tool Does Not Communicate with Low 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 
Inside Rearview Mirror 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 Presence System (PPS) Module Low Speed GMLAN Scan Tool Does Not Communicate with Low Speed GMLAN Device 
Radio (IRC) Low Speed GMLAN Scan Tool Does Not Communicate with Low Speed GMLAN Device 
Remote Control Door Lock Receiver (RCDLR) Low Speed GMLAN Scan Tool Does Not Communicate with Low Speed GMLAN Device 
Side Blind Zone Alert (SBZA) Module, left Low Speed GMLAN Scan Tool Does Not Communicate with Low Speed GMLAN Device 
Side Blind Zone Alert (SBZA) Module, right Low Speed GMLAN Scan Tool Does Not Communicate with Low Speed GMLAN Device 
Theft Deterrent Module (TDM) Low Speed GMLAN Scan Tool Does Not Communicate with Low Speed GMLAN Device 
Transmission Control Module (TCM) High Speed GMLAN Scan Tool Does Not Communicate with High Speed GMLAN Device 
Universal Park Assist (UPA) Module Low Speed GMLAN Scan Tool Does Not Communicate with Low Speed GMLAN Device 
Vehicle Communication Interface Module (OnStar)
  • High Speed GMLAN - pass through only
  • Low Speed GMLAN
 Scan Tool Does Not Communicate with Low Speed GMLAN Device 
Vehicle Direction Alert Alarm (Lane Departure) Warning Module Low Speed GMLAN Scan Tool Does Not Communicate with Low Speed GMLAN Device 
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