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Data Link References

WARNING: This page is about a different car, the 2007 Saturn Outlook. 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 .

Data Link References

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 
Digital Radio Receiver (DRR), w/U2K Low Speed GMLAN Scan Tool Does Not Communicate with Low Speed GMLAN Device 
Driver Door 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 
Engine/Powertrain Control Module (ECM/PCM) High Speed GMLAN Scan Tool Does Not Communicate with High Speed GMLAN Device 
Head Up Display Low Speed GMLAN Scan Tool Does Not Communicate with Low Speed GMLAN Device 
Headlamp Module High Speed GMLAN Scan Tool Does Not Communicate with High Speed GMLAN Device 
Heated Seat Control Module 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 
Instrument Panel Cluster (IPC) 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 
Liftgate Module Low Speed GMLAN Scan Tool Does Not Communicate with Low Speed GMLAN Device 
Memory Seat Module Low Speed GMLAN Scan Tool Does Not Communicate with Low Speed GMLAN Device 
Passenger Door Module Low Speed GMLAN Scan Tool Does Not Communicate with Low Speed GMLAN Device 
Passenger Presence System (PPS) 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 Park Assist Module Low Speed GMLAN Scan Tool Does Not Communicate with Low Speed GMLAN Device 
Rear Video/Audio/HVAC Module Low Speed GMLAN Scan Tool Does Not Communicate with Low Speed GMLAN Device 
RemoteControl Door Lock Receiver Low Speed GMLAN Scan Tool Does Not Communicate with Low Speed GMLAN Device 
Rollover Sensor (ROS) 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 
Transfer Case Shift Control Module High Speed GMLAN Scan Tool Does Not Communicate with High Speed GMLAN Device 
Transmission Control Module (TCM) High Speed GMLAN Scan Tool Does Not Communicate with High Speed GMLAN Device 
Vehicle Communication Interface Module (VCIM) (OnStar), w/UE1
  • High Speed GMLAN - pass through only
  • Low Speed GMLAN
 Scan Tool Does Not Communicate with Low Speed GMLAN Device 
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