Data Link References

This table identifies which serial data link that a particular device uses for in-vehicle data transmission. Some devices may use more than one data link to communicate. Some devices 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 devices listed will be applicable to all vehicles. Refer to the schematics to determine which devices apply. For the description and operation of these serial data communication circuits, refer to Data Link Communications Description and Operation .

Code	Device	Data Link Type	Diagnostic Procedure
Schematic Reference: Data Communication Schematics
A11	Radio	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
A22	Radio Controls	Local Interconnect Network (LIN)	DTC U1500-U15FF
A26	HVAC Controls	Local Interconnect Network (LIN)	DTC U1500-U15FF
B99	Steering Wheel Angle Sensor	Chassis High Speed GMLAN	Scan Tool Does Not Communicate with Chassis High Speed GMLAN Device
B119	Multi-axis Acceleration Sensor	Chassis High Speed GMLAN	Scan Tool Does Not Communicate with Chassis High Speed GMLAN Device
K9	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
K16	Battery Energy Control Module	High Speed GMLAN Powertrain Expansion Bus (with HP6)	Scan Tool Does Not Communicate with High Speed GMLAN Device DTC U0074 (Chassis Expansion Bus) , DTC U0074 (Powertrain Expansion Bus with HP6) , DTC U0074 (Mid Speed GMLAN) , DTC U0074 (Powertrain Expansion Bus without HP6) (with HP6)
K17	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
K19	Suspension 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
K20	Engine Control Module	High Speed GMLAN Powertrain Expansion Bus (with HP6)	Scan Tool Does Not Communicate with High Speed GMLAN Device DTC U0074 (Chassis Expansion Bus) , DTC U0074 (Powertrain Expansion Bus with HP6) , DTC U0074 (Mid Speed GMLAN) , DTC U0074 (Powertrain Expansion Bus without HP6) (with HP6)
K27	Fuel Pump Control Module	High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
K29	Seat Heating Control Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
K33	HVAC Control Module	Low Speed GMLAN Local Interconnect Network (LIN)	Scan Tool Does Not Communicate with Low Speed GMLAN Device DTC U1500-U15FF
K36	Inflatable Restraint Sensing and Diagnostic Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
K41	Front and Rear Parking Assist Control Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
K41R	Rear Parking Assist Control Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
K43	Power Steering Control Module	High Speed GMALN	Scan Tool Does Not Communicate with High Speed GMLAN Device
K59	Starter/Generator Control Module	High Speed GMLAN Powertrain Expansion Bus (with HP6)	Scan Tool Does Not Communicate with High Speed GMLAN Device DTC U0074 (Chassis Expansion Bus) , DTC U0074 (Powertrain Expansion Bus with HP6) , DTC U0074 (Mid Speed GMLAN) , DTC U0074 (Powertrain Expansion Bus without HP6) (with HP6)
K71	Transmission Control Module	High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
K73	Telematics Communication Interface Control Module	High Speed GMALN Low Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device Scan Tool Does Not Communicate with Low Speed GMLAN Device
K83	Parking Brake Control Module	High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
K84	Keyless Entry Control Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
K85	Passenger Presence Detection Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
K89	Immobilizer Control Module	Local Interconnect Network (LIN)	DTC U1500-U15FF
K111	Fuel Pump Driver Control Module	Powertrain Expansion Bus (without HP6)	DTC U0074 (Chassis Expansion Bus) , DTC U0074 (Powertrain Expansion Bus with HP6) , DTC U0074 (Mid Speed GMLAN) , DTC U0074 (Powertrain Expansion Bus without HP6) (without HP6)
M69	Sunroof Motor	Local Interconnect Network (LIN)	DTC U1500-U15FF
M74D	Window Motor - Driver	Local Interconnect Network (LIN)	DTC U1500-U15FF
M74P	Window Motor - Passenger	Local Interconnect Network (LIN)	DTC U1500-U15FF
P2	Transmission Shift Lever Position Indicator	Local Interconnect Network (LIN)	DTC U1500-U15FF
P16	Instrument Cluster	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
P17	Info Display Module	Local Interconnect Network (LIN)	DTC U1500-U15FF
S56	Radio Control Multifunction Switch	Local Interconnect Network (LIN)	DTC U1500-U15FF
S79D	Window Switch - Driver	Local Interconnect Network (LIN)	DTC U1500-U15FF
S79LR	Window Switch - Left Rear	Local Interconnect Network (LIN)	DTC U1500-U15FF
S79RR	Window Switch - Right Rear	Local Interconnect Network (LIN)	DTC U1500-U15FF
T11	Multimedia Player Interface Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device