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 MOST Bus Local Interconnect Network (LIN)	Scan Tool Does Not Communicate with Low Speed GMLAN Device DTC U0028 DTC U1500-U15FF
A20	Radio/HVAC Controls	Local Interconnect Network (LIN)	DTC U1500-U15FF
A26	HVAC Controls	Local Interconnect Network (LIN)	DTC U1500-U15FF
A33	Media Disc Player	MOST Bus	DTC U0028
B60	Passenger Presence Sensor	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
B99	Steering Wheel Angle Sensor	Chassis High Speed GMLAN	Scan Tool Does Not Communicate with Chassis High Speed GMLAN Device
B117	Rain Sensor	Local Interconnect Network (LIN)	DTC U1500-U15FF
B119	Multi-axis Acceleration Sensor	Chassis High Speed GMLAN	Scan Tool Does Not Communicate with Chassis High Speed GMLAN Device
B218L	Side Object Sensor Module - Left	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
B218R	Side Object Sensor Module - Right	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
B233B	Radar Sensor Module - Long Range	Object Bus	DTC U0075
B233LF	Radar Sensor Module - Short Range Left Front	Object Bus	DTC U0075
B233RF	Radar Sensor Module - Short Range Right Front	Object Bus	DTC U0075
B233R	Radar Sensor Module - Short Range Rear	Object Bus	DTC U0075
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
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
K18	Compass Module	Local Interconnect Network (LIN)	DTC U1500-U15FF
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	Scan Tool Does Not Communicate with High Speed GMLAN Device
K26	Headlamp Control Module	High Speed GMLAN Local Interconnect Network (LIN)	Scan Tool Does Not Communicate with High Speed GMLAN Device DTC U1500-U15FF
K27	Fuel Pump Control Module	High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
K29F	Seat Heating Control Module - Front	Local Interconnect Network (LIN)	DTC U1500-U15FF
K29R	Seat Heating Control Module - Rear	Local Interconnect Network (LIN)	DTC U1500-U15FF
K33	HVAC Control Module	Low Speed GMLAN Local Interconnect Network (LIN)	Scan Tool Does Not Communicate with Low Speed GMLAN Device DTC U1500-U15FF
K33A	HVAC Control Module - Auxiliary	Local Interconnect Network (LIN)	DTC U1500-U15FF
K36	Inflatable Restraint Sensing and Diagnostic Module	Chassis High Speed GMLAN (without UGN) Low Speed GMLAN	Scan Tool Does Not Communicate with Chassis High Speed GMLAN Device Scan Tool Does Not Communicate with Low Speed GMLAN Device
K40	Seat Memory Control Module	Low Speed GMLAN Local Interconnect Network (LIN)	Scan Tool Does Not Communicate with Low Speed GMLAN Device DTC U1500-U15FF
K41	Front and 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 Chassis High Speed GMALN	Scan Tool Does Not Communicate with High Speed GMLAN Device Scan Tool Does Not Communicate with Chassis High Speed GMLAN Device
K47	Rear Differential Clutch Control Module	High Speed GMALN Chassis High Speed GMALN	Scan Tool Does Not Communicate with High Speed GMLAN Device Scan Tool Does Not Communicate with Chassis High Speed GMLAN Device
K60	Steering Column Lock Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
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
K74	Human Machine Interface Control Module	High Speed GMALN MOST Bus	Scan Tool Does Not Communicate with High Speed GMLAN Device DTC U0028
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
K89	Immobilizer Control Module	Local Interconnect Network (LIN)	DTC U1500-U15FF
K96	Mirror Control Module	Local Interconnect Network (LIN)	DTC U1500-U15FF
K99	Steering Column Position Control Module	Local Interconnect Network (LIN)	DTC U1500-U15FF
K109	Frontview Camera Module	Object Bus Low Speed GMLAN	DTC U0075 Scan Tool Does Not Communicate with Low Speed GMLAN Device
K124	Active Safety Control Module	High Speed GMLAN Chassis High Speed GMLAN Object Bus Low Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device Scan Tool Does Not Communicate with Chassis High Speed GMLAN Device DTC U0075 Scan Tool Does Not Communicate with Low Speed GMLAN Device
M29L	Headlamp Leveling Actuator - Left	Local Interconnect Network (LIN)	DTC U1500-U15FF
M29R	Headlamp Leveling Actuator - Right	Local Interconnect Network (LIN)	DTC U1500-U15FF
M74D	Window Motor - Driver	Local Interconnect Network (LIN)	DTC U1500-U15FF
M74LR	Window Motor - Left Rear	Local Interconnect Network (LIN)	DTC U1500-U15FF
M74P	Window Motor - Passenger	Local Interconnect Network (LIN)	DTC U1500-U15FF
M74RR	Window Motor - Right Rear	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 MOST Bus Local Interconnect Network (LIN)	Scan Tool Does Not Communicate with Low Speed GMLAN Device DTC U0028 DTC U1500-U15FF
P17	Info Display Module	Low Speed GMLAN Local Interconnect Network (LIN)	Scan Tool Does Not Communicate with Low Speed GMLAN Device DTC U1500-U15FF
P29	Head-Up Display	Local Interconnect Network (LIN)	DTC U1500-U15FF
Q8	Control Solenoid Valve Assembly	High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
S52	Outside Rearview Mirror Switch	Local Interconnect Network (LIN)	DTC U1500-U15FF
S79D	Window Switch - Driver	Local Interconnect Network (LIN)	DTC U1500-U15FF
S79P	Window Switch - Passenger	Local Interconnect Network (LIN)	DTC U1500-U15FF
T3	Audio Amplifier	Low Speed GMLAN MOST Bus	Scan Tool Does Not Communicate with Low Speed GMLAN Device DTC U0028