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 wiring 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 .

Reference Information 

Schematic Reference: Data Communication Wiring Schematics

Code	Device	Data Link Type	Diagnostic Procedure
A11	Radio	Gateway Isolated Low Speed GMLAN MOST Bus Local Interconnect Network (LIN)	DTC U007D  DTC U0028  DTC U1500-U15FF
A22	Radio Controls	Gateway Isolated Low Speed GMLAN Local Interconnect Network (LIN)	DTC U007D  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
A34	HVAC Controls - Auxiliary	Local Interconnect Network (LIN)	DTC U1500-U15FF
B110	Battery 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
B233B	Radar Sensor Module - Long Range	Object High Speed GMLAN	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  DTC U0077
K19	Suspension 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 High Speed GMLAN Local Interconnect Network (LIN)	Scan Tool Does Not Communicate with High Speed GMLAN Device  DTC U0074  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
K36	Inflatable Restraint Sensing and Diagnostic Module	Chassis High Speed GMLAN Low Speed GMLAN	DTC U0077  Scan Tool Does Not Communicate with Low Speed GMLAN Device
K38	Chassis Control Module	High Speed GMLAN Chassis High Speed GMLAN Local Interconnect Network (LIN)	Scan Tool Does Not Communicate with High Speed GMLAN Device  DTC U0077  DTC U1500-U15FF
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
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
K56	Serial Data Gateway Module	Gateway Expansion High Speed GMLAN Gateway Isolated High Speed GMLAN High Speed GMLAN Gateway Isolated Low Speed GMLAN Low Speed GMLAN Chassis High Speed GMLAN	DTC U007B  DTC U007C  Scan Tool Does Not Communicate with High Speed GMLAN Device  DTC U007D  Scan Tool Does Not Communicate with Low Speed GMLAN Device  DTC U0077
K60	Steering Column Lock Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
K71 / Q8 / T12	Transmission Control Module / Control Solenoid Valve Assembly / Automatic Transmission Assembly	High Speed GMLAN Local Interconnect Network (LIN)	Scan Tool Does Not Communicate with High Speed GMLAN Device  DTC U1500-U15FF
K73	Telematics Communication Interface Control Module	Gateway Isolated High Speed GMLAN Gateway Isolated Low Speed GMLAN	DTC U007C  DTC U007D
K74	Human Machine Interface Control Module	Gateway Isolated High Speed GMLAN MOST Bus Local Interconnect Network (LIN)	DTC U007C  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
K89	Immobilizer 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	High Speed GMLAN Low Speed GMLAN Object High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device  Scan Tool Does Not Communicate with Low Speed GMLAN Device  DTC U0075
K111	Fuel Pump Driver Control Module	Powertrain High Speed GMLAN	DTC U0074
K124	Active Safety Control Module	Gateway Expansion High Speed GMLAN Low Speed GMLAN Object High Speed GMLAN Chassis High Speed GMLAN	DTC U007B  Scan Tool Does Not Communicate with Low Speed GMLAN Device  DTC U0075  DTC U0077
K157	Video Processing Control Module	Gateway Isolated Low Speed GMLAN	DTC U007D
K171	Hands-Free Liftgate Sensor Control Module	Local Interconnect Network (LIN)	DTC U1500-U15FF
K182	Parking Assist Control Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
K188	Human Machine Interface Control Module Bypass Module	Local Interconnect Network (LIN)	DTC U1500-U15FF
M35D	Window Motor Module - Driver	Local Interconnect Network (LIN)	DTC U1500-U15FF
M69	Sunroof Motor	Local Interconnect Network (LIN)	DTC U1500-U15FF
M96A	Active Grille Air Shutter 1 Actuator	Local Interconnect Network (LIN)	DTC U1500-U15FF
M96B	Active Grille Air Shutter 2 Actuator	Local Interconnect Network (LIN)	DTC U1500-U15FF
P2	Transmission Shift Lever Position Indicator	Local Interconnect Network (LIN)	DTC U1500-U15FF
P16	Instrument Cluster	Gateway Isolated Low Speed GMLAN MOST Bus Local Interconnect Network (LIN)	DTC U007D  DTC U0028  DTC U1500-U15FF
S3	Transmission Shift Lever	Local Interconnect Network (LIN)	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
T3	Audio Amplifier	Gateway Isolated Low Speed GMLAN MOST Bus	DTC U007D  DTC U0028
T19	Power Supply Transformer	Powertrain High Speed GMLAN	DTC U0074