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 Ethernet Bus	Scan Tool Does Not Communicate with Gateway Isolated High Speed GMLAN Device Scan Tool Does Not Communicate with Gateway Isolated Low Speed GMLAN Device DTC U18AF-U18B4
A26	HVAC Controls	Low Speed GMLAN Local Interconnect Network (LIN)	Scan Tool Does Not Communicate with Low Speed GMLAN Device DTC U1500-U15FF
A97	Transmission Range Selector Controls	Powertrain High Speed GMLAN Powertrain Sensor High Speed GMLAN	DTC U0074 DTC U0076
B10B	Ambient Light/Sunload Sensor	Local Interconnect Network (LIN)	DTC U1500-U15FF
B110	Battery Sensor Module	Local Interconnect Network (LIN)	DTC U1500-U15FF
B160	Windshield Temperature and Inside Moisture Sensor	Local Interconnect Network (LIN)	DTC U1500-U15FF
B174W	Frontview Camera - Windshield	Gateway Expansion High Speed GMLAN High Speed GMLAN Low Speed GMLAN	Scan Tool Does Not Communicate with Gateway Expansion High Speed GMLAN Device Scan Tool Does Not Communicate with High Speed GMLAN Device Scan Tool Does Not Communicate with Low Speed GMLAN Device
B218L	Side Object Sensor Module - Left	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
G10	Cooling Fan Motor	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
K20	Engine Control Module	High Speed GMLAN Powertrain High Speed GMLAN Powertrain Sensor High Speed GMLAN Local Interconnect Network (LIN)	Scan Tool Does Not Communicate with High Speed GMLAN Device DTC U0074 DTC U0076 DTC U1500-U15FF
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
K36	Inflatable Restraint Sensing and Diagnostic Module	Chassis High Speed GMLAN Low Speed GMLAN	Scan Tool Does Not Communicate with Chassis High Speed GMLAN Device 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
K43	Power Steering 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
K47	Rear Differential Clutch 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
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	Scan Tool Does Not Communicate with Gateway Expansion High Speed GMLAN Device Scan Tool Does Not Communicate with Gateway Isolated High Speed GMLAN Device Scan Tool Does Not Communicate with High Speed GMLAN Device Scan Tool Does Not Communicate with Gateway Isolated Low Speed GMLAN Device Scan Tool Does Not Communicate with Low Speed GMLAN Device Scan Tool Does Not Communicate with Chassis High Speed GMLAN Device
K61	Sunroof Control Module	Local Interconnect Network (LIN)	DTC U1500-U15FF
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 Ethernet Bus	Scan Tool Does Not Communicate with Gateway Isolated High Speed GMLAN Device Scan Tool Does Not Communicate with Gateway Isolated Low Speed GMLAN Device DTC U18AF-U18B4
K78	Head-Up Display Module	Gateway Isolated Low Speed GMLAN Ethernet Bus	Scan Tool Does Not Communicate with Gateway Isolated Low Speed GMLAN Device DTC U18AF-U18B4
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
K111	Fuel Pump Driver Control Module	Powertrain Sensor High Speed GMLAN	DTC U0076
K157	Video Processing Control Module	Gateway Isolated Low Speed GMLAN	Scan Tool Does Not Communicate with Gateway Isolated Low Speed GMLAN Device
K160	Brake System 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
K171	Hands-Free Liftgate Sensor Control Module	Local Interconnect Network (LIN)	DTC U1500-U15FF
K182	Parking Assist Control Module	Chassis High Speed GMLAN Low Speed GMLAN	Scan Tool Does Not Communicate with Chassis High Speed GMLAN Device Scan Tool Does Not Communicate with Low Speed GMLAN Device
M35D	Window Motor Module - Driver	Local Interconnect Network (LIN)	DTC U1500-U15FF
M96A	Active Grille Air Shutter 1 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 Ethernet Bus Local Interconnect Network (LIN)	Scan Tool Does Not Communicate with Gateway Isolated Low Speed GMLAN Device DTC U18AF-U18B4 DTC U1500-U15FF
P17	Info Display Module	Gateway Isolated Low Speed GMLAN	Scan Tool Does Not Communicate with Gateway Isolated Low Speed GMLAN Device
S32D	Seat Heating Switch - Driver	Local Interconnect Network (LIN)	DTC U1500-U15FF
S32LR	Seat Heating Switch - Left Rear	Local Interconnect Network (LIN)	DTC U1500-U15FF
S32P	Seat Heating Switch - Passenger	Local Interconnect Network (LIN)	DTC U1500-U15FF
S32RR	Seat Heating Switch - Right Rear	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 Ethernet Bus	Scan Tool Does Not Communicate with Gateway Isolated Low Speed GMLAN Device DTC U18AF-U18B4
T19	Power Supply Transformer	Powertrain High Speed GMLAN	DTC U0074