LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Cadillac >> 2009 >> SRX 3.6 7, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Data Communication System >> Diagnostic Information and Procedures >> Data Link References
April 5, 2026: LEMON Manuals is launched! Read the announcement.

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 
Audio Amplifier Low Speed GMLAN Scan Tool Does Not Communicate with Low Speed GMLAN Device 
Automatic Occupant Sensing (PPS) 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 
Digital Radio Receiver (DRR) 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 Module (MSM) 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 / Powertrain Control Module (ECM/PCM) High Speed GMLAN Scan Tool Does Not Communicate with High Speed GMLAN Device 
Export Body Control Module (XBCM) Low Speed GMLAN Scan Tool Does Not Communicate with Low Speed GMLAN Device 
Headlamp Leveling Control Module (HCM) w/ TR7 Keyword 2000 Dedicated data line from terminal 7 of the DLC to the HCM
Heated Seat Module (HSM) 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 
Passenger Door Module (PDM) Low Speed GMLAN Scan Tool Does Not Communicate with Low Speed GMLAN Device 
Power Liftgate Module (PLGM) 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 Seat Audio (RSA) Module Low Speed GMLAN Scan Tool Does Not Communicate with Low Speed GMLAN Device 
Rear Seat Module (RSM) 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 
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 
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 VCIM)
  • High Speed GMLAN - pass through only
  • Low Speed GMLAN
 Scan Tool Does Not Communicate with Low Speed GMLAN Device 
scientia non olet · About LEMON Manuals