Data Link References

This table identifies which serial data link that a particular control module uses for in-vehicle data transmission. Some control modules may use more than one data link to communicate. Some control 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. Not all control modules listed will be applicable to all vehicles. Refer to the schematics above to determine which control modules apply. 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
Body Control Module	High Speed GMLAN Low Speed GMLAN Local Interconnect Network (LIN)	Scan Tool Does Not Communicate with High Speed GMLAN Device Scan Tool Does Not Communicate with Low Speed GMLAN Device DTC U1500-U15FF
Electronic Brake Control Module	High Speed GMLAN Chassis High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device Scan Tool Does Not Communicate with Chassis High Speed GMLAN Device
Engine Control Module	High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
Front and Rear Parking Assist Control Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
Fuel Pump Control Module	High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
HVAC Control Module	Low Speed GMLAN Local Interconnect Network (LIN)	Scan Tool Does Not Communicate with Low Speed GMLAN Device DTC U1500-U15FF
HVAC Controls Switch Assembly	Local Interconnect Network (LIN)	DTC U1500-U15FF
Inflatable Restraint Sensing and Diagnostic Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
Info Display Module	Local Interconnect Network (LIN)	DTC U1500-U15FF
Instrument Cluster	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
Multi-axis Acceleration Sensor	Chassis High Speed GMLAN	Scan Tool Does Not Communicate with Chassis High Speed GMLAN Device
Multimedia Player Interface Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
Passenger Presence Detection Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
Power Steering Control Module	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 Controls	Local Interconnect Network (LIN)	DTC U1500-U15FF
Seat Heating Control Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
Steering Wheel Angle Sensor	Chassis High Speed GMLAN	Scan Tool Does Not Communicate with Chassis High Speed GMLAN Device
Steering Column Lock Control Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
Sunroof Control Module	Local Interconnect Network (LIN)	DTC U1500-U15FF
Telematics Communication Interface Control Module	High Speed GMLAN Low Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device Scan Tool Does Not Communicate with Low Speed GMLAN Device
Transmission Control Module	High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
Window Motor - Driver	Local Interconnect Network (LIN)	DTC U1500-U15FF
Window Switch - Driver	Local Interconnect Network (LIN)	DTC U1500-U15FF
Window Switch - Left Rear	Local Interconnect Network (LIN)	DTC U1500-U15FF
Window Switch - Passenger	Local Interconnect Network (LIN)	DTC U1500-U15FF
Window Switch - Right Rear	Local Interconnect Network (LIN)	DTC U1500-U15FF