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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 Body Control System Description and Operation .

Control Module Data Link Type Diagnostic Procedure
Schematic Reference: Body Control System Description and Operation 
Active Front Steering (AFS) Module w/ JL7 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 
Vehicle Communication Interface Module (OnStar)
  • High Speed GMLAN - pass through only
  • Low Speed GMLAN
 Scan Tool Does Not Communicate with High Speed GMLAN Device  or Scan Tool Does Not Communicate with Low Speed GMLAN Device 
Digital Radio Receiver (DRR) Module Low Speed GMLAN Scan Tool Does Not Communicate with Low Speed GMLAN Device 
Distance Sensing Cruise Control (DSCC) Module High 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 Door Switch (DDS) Low Speed GMLAN Scan Tool Does Not Communicate with Low Speed GMLAN Device 
Dynamic Headlamp Leveling (DHL) Module, w/ TR7 High Speed GMLAN Scan Tool Does Not Communicate with High 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 or MRRTD) 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 
Head Up Display (HUD) Low Speed GMLAN Scan Tool Does Not Communicate with Low Speed GMLAN Device 
Climate Control Panel (CCP) Module 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 
Instrument Panel Module (IPM)
  • High Speed GMLAN
  • Low Speed GMLAN
 Scan Tool Does Not Communicate with High Speed GMLAN Device  or 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 
Left Rear Door Module (LRDM) 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 
Radio Low Speed GMLAN Scan Tool Does Not Communicate with Low Speed GMLAN Device 
Rear Integration Module (RIM) 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 
Right Rear Door Module (RRDM) 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 
Steering Column Lock Control Module (SCLM), w/ UA2 Low Speed GMLAN Scan Tool Does Not Communicate with Low Speed GMLAN Device 
Supervisory Control Module (SCM) w/ JL7 High Speed GMLAN Scan Tool Does Not Communicate with High Speed GMLAN Device 
Television Tuner Module, w/ YQ6 or YQ7 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 
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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