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. Not all modules listed will be applicable to all vehicles. Refer to the schematics to determine which 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	Diagnosis Procedure
Schematic Reference: Data Communication Schematics
Advanced Parking Assist Control Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
Body Control Module	• High Speed GMLAN • Mid 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 Mid Speed GMLAN Device • Scan Tool Does Not Communicate with Low Speed GMLAN Device • DTC U1500-U15BF
Chime Alarm Control Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
Compass Module	Local Interconnect Network (LIN)	DTC U1500-U15BF
Content Theft Deterrent Sensor Module	Local Interconnect Network (LIN)	DTC U1500-U15BF
Digital Radio Receiver Control Module	Mid Speed GMLAN	Scan Tool Does Not Communicate with Mid Speed GMLAN Device
Driver Door Switch Panel Control Module	Local Interconnect Network (LIN)	DTC U1500-U15BF
Driver Mirror Control Module	Local Interconnect Network (LIN)	DTC U1500-U15BF
Electronic Brake Control Module	• High Speed GMLAN • Chassis High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device or 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 Seat Heating 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
Headlamp Control Module	High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
Headlamp High Beam Control Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
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-U15BF
Infotainment Faceplate Control Module	Local Interconnect Network (LIN)	DTC U1500-U15BF
Inside Rear View Mirror	Local Interconnect Network (LIN)	DTC U1500-U15BF
Instrument Panel Cluster	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
Keyless Entry Control Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
Left Front Window Motor Module	Local Interconnect Network (LIN)	DTC U1500-U15BF
Left Headlamp Module	Local Interconnect Network (LIN)	DTC U1500-U15BF
Left Rear Door Switch Panel Control Module	Local Interconnect Network (LIN)	DTC U1500-U15BF
Left Rear Window Motor Module	Local Interconnect Network (LIN)	DTC U1500-U15BF
Liftgate Control Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
Memory Seat Control Module	Low Speed GMLAN Local Interconnect Network (LIN)	Scan Tool Does Not Communicate with Low Speed GMLAN Device or DTC U1500-U15BF
Mobile Telephone Control Module	• Mid Speed GMLAN • Low Speed GMLAN	Scan Tool Does Not Communicate with Mid Speed GMLAN Device or Scan Tool Does Not Communicate with Low Speed GMLAN Device
Multi-axis Acceleration Sensor Module	Chassis High Speed GMLAN	Scan Tool Does Not Communicate with Chassis High Speed GMLAN Device
Parking Assist Control Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
Parking Brake Control Module	High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
Parking Heater Control Module (GME Only)	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
Passenger Door Switch Panel Control Module	Local Interconnect Network (LIN)	DTC U1500-U15BF
Passenger Mirror Control Module	Local Interconnect Network (LIN)	DTC U1500-U15BF
Passenger Presence Detection Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
Power Sounder Content Theft Deterrent Alarm Module	Local Interconnect Network (LIN)	DTC U1500-U15BF
Power Steering Control Module	• High Speed GMLAN • Chassis High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device or Scan Tool Does Not Communicate with Chassis High Speed GMLAN Device
Radio (Base)	• Mid Speed GMLAN • Low Speed GMLAN	Scan Tool Does Not Communicate with Mid Speed GMLAN Device or Scan Tool Does Not Communicate with Low Speed GMLAN Device
Radio (High Content Navigation)	• Mid Speed GMLAN • Low Speed GMLAN	Scan Tool Does Not Communicate with Mid Speed GMLAN Device or Scan Tool Does Not Communicate with Low Speed GMLAN Device
Radio (In-Dash CD Changer)	• Mid Speed GMLAN • Low Speed GMLAN	Scan Tool Does Not Communicate with Mid Speed GMLAN Device or Scan Tool Does Not Communicate with Low Speed GMLAN Device
Radio (Medium Content Navigation)	• Mid Speed GMLAN • Low Speed GMLAN	Scan Tool Does Not Communicate with Mid Speed GMLAN Device or Scan Tool Does Not Communicate with Low Speed GMLAN Device
Radio (Rear Seat Entertainment Lite)	• Mid Speed GMLAN • Low Speed GMLAN	Scan Tool Does Not Communicate with Mid Speed GMLAN Device or Scan Tool Does Not Communicate with Low Speed GMLAN Device
Rain/Ambient Light Sensor Module	Local Interconnect Network (LIN)	DTC U1500-U15BF
Rear Differential Clutch Control Module	• High Speed GMLAN • Chassis High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device or Scan Tool Does Not Communicate with Chassis High Speed GMLAN Device
Remote Heater and Air Conditioning Control Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
Right Front Window Motor Module	Local Interconnect Network (LIN)	DTC U1500-U15BF
Right Headlamp Module	Local Interconnect Network (LIN)	DTC U1500-U15BF
Right Rear Door Switch Panel Control Module	Local Interconnect Network (LIN)	DTC U1500-U15BF
Right Rear Window Motor Module	Local Interconnect Network (LIN)	DTC U1500-U15BF
Steering Angle Sensor Module	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 Sunshade Motor Module	Local Interconnect Network (LIN)	DTC U1500-U15BF
Sunroof Window Motor Module	Local Interconnect Network (LIN)	DTC U1500-U15BF
Suspension Control Module	• High Speed GMLAN • Chassis High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device or Scan Tool Does Not Communicate with Chassis High Speed GMLAN Device
Tire Pressure Sensor Locator Module	Local Interconnect Network (LIN)	DTC U1500-U15BF
Trailer Interface Control Module	Low Speed GMLAN	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
Transmission Range Indicator Module	Local Interconnect Network (LIN)	DTC U1500-U15BF
Variable Power Steering Control Module	High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
Vehicle Communication Interface Module (VCIM)	• High Speed GMLAN • Low Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device or Scan Tool Does Not Communicate with Low Speed GMLAN Device
Vehicle Direction Camera Control Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device