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Data Link References

WARNING: This page is about a different car, the 2008 Cadillac CTS. 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 
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 
Driver Door Module Low Speed GMLAN Scan Tool Does Not Communicate with Low Speed GMLAN Device 
Electronic Brake Control Module High Speed GMLAN Scan Tool Does Not Communicate with High Speed GMLAN Device 
Engine Control Module High Speed GMLAN Scan Tool Does Not Communicate with High Speed GMLAN Device 
Front Passenger Door Module Low Speed GMLAN Scan Tool Does Not Communicate with Low Speed GMLAN Device 
HVAC Control Module CJ4/CJ2/C67 Low Speed GMLAN Scan Tool Does Not Communicate with Low Speed GMLAN Device 
Headlamp Leveling Module High Speed GMLAN Scan Tool Does Not Communicate with High 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 
Memory Seat Module (MSM)/Driver Position Module (DPM) w/A45 or w/AM3 Low Speed GMLAN Scan Tool Does Not Communicate with Low Speed GMLAN Device 
Pedestrian Impact Protection Modul (PIP) 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 Dorr Lock Receiver Low Speed GMLAN Scan Tool Does Not Communicate with Low Speed GMLAN Device 
Theft Deterent Alarm Low Speed GMLAN Scan Tool Does Not Communicate with Low Speed GMLAN Device 
Theft Deterent 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 
Vehical Control Interface Module (VCIM)
  • High Speed GMLAN
  • Low Speed GMLAN
 Scan Tool Does Not Communicate with High Speed GMLAN Device 
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