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 .

Reference Information

Schematic Reference: Data Communication Wiring Schematics

Code	Device	Data Link Type	Diagnostic Procedure
A11	Radio	Gateway Isolated High Speed GMLAN Gateway Isolated Low Speed GMLAN MOST Bus Ethernet Bus Local Interconnect Network (LIN)	DTC U007C DTC U007D DTC U0028 DTC U18AF-U18B4 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
B174W	Frontview Camera - Windshield	Low Speed GMLAN Object High Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device DTC U0075
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
E13LA	Headlamp Assembly - Left	Headlamp Leveling High Speed GMLAN	DTC U1112-U1115
E13RA	Headlamp Assembly - Right	Headlamp Leveling High Speed GMLAN	DTC U1112-U1115
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
K26	Headlamp Control Module	High Speed GMLAN Headlamp Leveling High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device DTC U1112-U1115
K29	Seat Heating Control Module	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
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
K40P	Seat Memory Control Module - Passenger	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 Isolated High Speed GMLAN High Speed GMLAN Gateway Isolated Low Speed GMLAN Low Speed GMLAN	DTC U007C Scan Tool Does Not Communicate with High Speed GMLAN Device DTC U007D Scan Tool Does Not Communicate with Low Speed GMLAN Device
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	Gateway Isolated High Speed GMLAN Gateway Isolated Low Speed GMLAN Ethernet Bus	DTC U007C DTC U007D DTC U18AF-U18B4
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
K111	Fuel Pump Driver Control Module	Powertrain High Speed GMLAN	DTC U0074
K124	Active Safety Control Module	High Speed GMLAN Low Speed GMLAN Object High Speed GMLAN Chassis 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 DTC U0077
K134D	Seat Bolster Memory Control Module - Driver	Local Interconnect Network (LIN)	DTC U1500-U15FF
K134P	Seat Bolster Memory Control Module - Passenger	Local Interconnect Network (LIN)	DTC U1500-U15FF
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
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	Gateway Isolated Low Speed GMLAN MOST Bus Ethernet Bus Local Interconnect Network (LIN)	DTC U007D DTC U0028 DTC U18AF-U18B4 DTC U1500-U15FF
P17	Info Display Module	Gateway Isolated Low Speed GMLAN Local Interconnect Network (LIN)	DTC U007D DTC U1500-U15FF
P25	Power Sounder Content Theft Deterrent Alarm Module	Local Interconnect Network (LIN)	DTC U1500-U15FF
P29	Head-Up Display	Local Interconnect Network (LIN)	DTC U1500-U15FF
S70R	Steering Wheel Controls Switch - Right	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
S146	Window/Outside Rearview Mirror Switch - Driver	Local Interconnect Network (LIN)	DTC U1500-U15FF
T3	Audio Amplifier	Gateway Isolated Low Speed GMLAN MOST Bus Ethernet Bus	DTC U007D DTC U0028 DTC U18AF-U18B4
T19	Power Supply Transformer	Powertrain High Speed GMLAN	DTC U0074