Data Link References

This table identifies which serial data link that a particular module uses for in-vehicle data transmission. Some modules may use more than one data link to communicate. Some modules 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. 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 Wiring Schematics
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
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
B218R	Side Object Sensor Module - Right	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
B305	Ambient Light/Sunload Sensor and Battery State Of Charge Indicator	Local Interconnect Network (LIN)	DTC U1500-U15FF
G1 / K118	A/C Compressor / Electric A/C Compressor Control Module	High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
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
K10	Coolant Heater Control Module	Local Interconnect Network (LIN)	DTC U1500-U15FF
K16	Battery Energy Control Module	High Speed GMLAN High Voltage Management Expansion Bus	Scan Tool Does Not Communicate with High Speed GMLAN Device DTC U007A
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
K20	Engine Control Module	High Speed GMLAN Powertrain Expansion Bus 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
K32	Steering Wheel 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	Low Speed GMLAN Chassis High Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device Scan Tool Does Not Communicate with Chassis High Speed GMLAN Device
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
K56	Serial Data Gateway Module	High Speed GMLAN Gateway Expansion High Speed GMLAN Gateway Isolated High Speed GMLAN Low Speed GMLAN Gateway Isolated Low Speed GMLAN Chassis High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device 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 Low Speed GMLAN Device Scan Tool Does Not Communicate with Gateway Isolated Low Speed GMLAN Device Scan Tool Does Not Communicate with Chassis High Speed GMLAN Device
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
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
K114A / T6	Hybrid/EV Powertrain Control Module 1 / Power Inverter Module	High Speed GMLAN Chassis High Speed GMLAN Powertrain Expansion Bus	Scan Tool Does Not Communicate with High Speed GMLAN Device Scan Tool Does Not Communicate with Chassis High Speed GMLAN Device DTC U0074
K114B	Hybrid/EV Powertrain Control Module 2	Low Speed GMLAN High Speed GMLAN Powertrain Expansion Bus High Voltage Management Expansion Bus	Scan Tool Does Not Communicate with Low Speed GMLAN Device Scan Tool Does Not Communicate with High Speed GMLAN Device DTC U0074 DTC U007A
K132	Pedestrian Alert Sound Control Module	High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
K157	Video Processing Control Module	Gateway Isolated Low Speed GMLAN	Scan Tool Does Not Communicate with Gateway Isolated Low Speed GMLAN Device
K173	Transmission Range 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
K177	Brake Booster 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
K182	Parking Assist Control Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
K190	Power Line Communication Module	High Speed GMLAN High Voltage Management Expansion Bus	Scan Tool Does Not Communicate with High Speed GMLAN Device DTC U007A
K212	Electronic Transmission Shift Control Pushbutton Circuit Board	Powertrain Expansion Bus Powertrain Sensor High Speed GMLAN	DTC U0074 DTC U0076
M74D	Window Motor - Driver	Local Interconnect Network (LIN)	DTC U1500-U15FF
M75L	Windshield Wiper Motor Module - Left	Local Interconnect Network (LIN)	DTC U1500-U15FF
M96A	Active Grille Air Shutter 1 Actuator	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
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
V1	Air Ionizer	Local Interconnect Network (LIN)	DTC U1500-U15FF