Data Link References

WARNING: This page is about a different car, the 2007 Cadillac DTS. 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
Air Suspension Control Module (ASCM) w/F38	High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
Amplifier	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
Auxiliary HVAC Control Module	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
Communication Interface Module (OnStar), w/UE1	High Speed GMLAN - pass through only Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
Digital Radio Receiver (DRR), w/U2K	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
Distance Sensing Cruise Control (DSCC) Module w/K59	High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
Driver Door Module (DDM)/Driver Door Switch Assembly (DDSA)	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
Driver Door Module (DDM)/Driver Door Switch Assembly (DDSA)	Local Interconnect Network (LIN)	DTC U1500, U1511, U1512, or U1513
Electronic Brake Control Module (EBCM)	High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
Electronic Suspension Control (ESC) Module w/FE1, F55	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
Front and Rear Object Alarm Module w/UFR	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
Front Passenger Door Module (FPDM)	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
Front Passenger Door Module (FPDM)	Local Interconnect Network (LIN)	DTC U1500, U1511, U1512, or U1513
HVAC Control Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
Inside Rearview Mirror	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
Memory Seat Module (MSM)/Driver Position Module (DPM)	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 Heated Seat Control Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
Remote Function Actuator (RFA)	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 Theft Deterrent (VTD) Control Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
Video Display w/U3Q	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
Window Motors (all)	Local Interconnect Network (LIN)	DTC U1500, U1511, U1512, or U1513