Data Link References

WARNING: This page is about a different car, the 2004 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 Link Connector (DLC) Schematics
Audio Amplifier	Class 2	Refer to Scan Tool Does Not Communicate with Class 2 Device
Dash Integration Module (DIM)	Class 2	Refer to Scan Tool Does Not Communicate with Class 2 Device
Digital Radio Receiver (DRR)	Class 2	Refer to Scan Tool Does Not Communicate with Class 2 Device
Driver Door Module (DDM)	Class 2	Refer to Scan Tool Does Not Communicate with Class 2 Device
Driver Door Switch Assembly (DDSA)	Class 2	Refer to Scan Tool Does Not Communicate with Class 2 Device
Electronic Brake Control Module (EBCM)	Class 2	Refer to Scan Tool Does Not Communicate with Class 2 Device
Engine Control Module (ECM)	Class 2 Keyword 2000 (LA3/LY9) High Speed GMLAN (LY7)	Refer to Scan Tool Does Not Communicate with Keyword Data Line (LA3/LY9) or Scan Tool Does Not Communicate with High Speed GMLAN Device (LY7)
Front Passenger Door Module (FPDM)	Class 2	Refer to Scan Tool Does Not Communicate with Class 2 Device
Instrument Panel Cluster (IPC)	Class 2	Refer to Scan Tool Does Not Communicate with Class 2 Device
Inflatable Restraint Sensing and Diagnostic Module (SDM)	Class 2	Refer to Scan Tool Does Not Communicate with Class 2 Device
Headlamp - Left	Keyword 2000	Refer to Scan Tool Does Not Communicate with Keyword Data Line
Headlamp - Right	Keyword 2000	Refer to Scan Tool Does Not Communicate with Keyword Data Line
HVAC Control Module	Class 2	Refer to Scan Tool Does Not Communicate with Class 2 Device
Left Rear Door Module (LRDM)	Class 2	Refer to Scan Tool Does Not Communicate with Class 2 Device
Memory Seat Module (MSM)	Class 2	Refer to Scan Tool Does Not Communicate with Class 2 Device
Radio	Class 2	Refer to Scan Tool Does Not Communicate with Class 2 Device
Radio Antenna Module	Class 2	Refer to Scan Tool Does Not Communicate with Class 2 Device
Rear Integration Module (RIM)	Class 2	Refer to Scan Tool Does Not Communicate with Class 2 Device
Right Rear Door Module (RRDM)	Class 2	Refer to Scan Tool Does Not Communicate with Class 2 Device
Transmission Control Module (TCM)	Keyword 2000 (LA3/LY9) High Speed GMLAN (LY7)	Refer to Scan Tool Does Not Communicate with Keyword Data Line (LA3/LY9) or Scan Tool Does Not Communicate with High Speed GMLAN Device (LY7)
Theft Deterrent Control Module	Class 2	Refer to Scan Tool Does Not Communicate with Class 2 Device
TV Antenna Module	Class 2	Refer to Scan Tool Does Not Communicate with Class 2 Device
Vehicle Communication Interface Module (VCIM)	Class 2	Refer to Scan Tool Does Not Communicate with Class 2 Device