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
A26	HVAC Controls	Low Speed GMLAN Local Interconnect Network (LIN)	Scan Tool Does Not Communicate with Low Speed GMLAN Device  DTC U1500-U15FF
B110	Battery Sensor Module	Local Interconnect Network (LIN)	DTC U1500-U15FF
B119	Multi-axis Acceleration Sensor	Chassis High Speed GMLAN	DTC U0077
B174W	Frontview Camera - Windshield	High Speed GMLAN Object Bus Low Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device  DTC U0075  Scan Tool Does Not Communicate with Low Speed GMLAN Device
B200	Rain Sensor Module	Local Interconnect Network (LIN)	DTC U1500-U15FF
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
C2	Remote CD Changer	MOST Bus	DTC U0028
E13LA	Headlamp Assembly - Left	Local Interconnect Network (LIN)	DTC U1500-U15FF
E13RA	Headlamp Assembly - Right	Local Interconnect Network (LIN)	DTC U1500-U15FF
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  DTC U0077
K20	Engine Control Module	High Speed GMLAN Powertrain Expansion Bus Local Interconnect Network (LIN)	Scan Tool Does Not Communicate with High Speed GMLAN Device  DTC U0074  DTC U1500-U15FF
K28	Headlamp Leveling Control Module	High Speed GMLAN Local Interconnect Network (LIN)	Scan Tool Does Not Communicate with High Speed GMLAN Device  DTC U1500-U15FF
K29	Seat Heating Control Module	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	Low Speed GMLAN Chassis High Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device  DTC U0077
K39	Liftgate Control Module	Low Speed GMLAN Local Interconnect Network (LIN)	Scan Tool Does Not Communicate with Low Speed GMLAN Device  DTC U1500-U15FF
K40D	Seat Memory Control Module - Driver	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 Chassis High Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device  DTC U0077
K43	Power Steering Control Module	High Speed GMLAN Chassis High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device  DTC U0077
K47	Rear Differential Clutch Control Module	High Speed GMLAN Chassis High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device  DTC U0077
K48	Infotainment Faceplate Control Module	Low Speed GMLAN Local Interconnect Network (LIN)	Scan Tool Does Not Communicate with Low Speed GMLAN Device  DTC U1500-U15FF
K61	Sunroof Control Module	Local Interconnect Network (LIN)	DTC U1500-U15FF
K62	Sunroof Sunshade Motor Module	Local Interconnect Network (LIN)	DTC U1500-U15FF
K71 / Q8 / T12	Transmission Control Module / Control Solenoid Valve Assembly / Automatic Transmission Assembly	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 GMLAN MOST Bus Local Interconnect Network (LIN)	Scan Tool Does Not Communicate with High Speed GMLAN Device  DTC U0028  DTC U1500-U15FF
K84	Keyless Entry Control Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
K85	Passenger Presence Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
K96	Mirror Control Module	Local Interconnect Network (LIN)	DTC U1500-U15FF
K111	Fuel Pump Driver Control Module	Powertrain Expansion Bus	DTC U0074
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  DTC U0077  DTC U0075  Scan Tool Does Not Communicate with Low Speed GMLAN Device
K157	Video Processing Control Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
K171	Hands-Free Liftgate Sensor Control Module	Local Interconnect Network (LIN)	DTC U1500-U15FF
M74D	Window Motor - Driver	Local Interconnect Network (LIN)	DTC U1500-U15FF
M96	Active Grille Air Shutter Actuator	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
S70R	Steering Wheel Controls Switch - Right	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
S79P	Window Switch - Passenger	Local Interconnect Network (LIN)	DTC U1500-U15FF
S79RR	Window Switch - Right Rear	Local Interconnect Network (LIN)	DTC U1500-U15FF
T1	Accessory DC/AC Power Inverter Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
T3	Audio Amplifier	Low Speed GMLAN MOST Bus	Scan Tool Does Not Communicate with Low Speed GMLAN Device  DTC U0028
T19	Power Supply Transformer	Powertrain Expansion Bus	DTC U0074