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 Low Speed GMLAN MOST Bus Local Interconnect Network (LIN)	DTC U007D 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
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 High Speed GMLAN	DTC U0075
B284	Vehicle Dynamic Sensor	Chassis Expansion Bus	DTC U0077
B305	Ambient Light/Sunload Sensor and Battery State Of Charge Indicator	Local Interconnect Network (LIN)	DTC U1500-U15FF
G1	A/C Compressor	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 Expansion Bus	Scan Tool Does Not Communicate with High Speed GMLAN Device DTC U0077
K20	Engine Control Module	High Speed GMLAN Powertrain Expansion Bus	Scan Tool Does Not Communicate with High Speed GMLAN Device DTC U0074
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
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 Expansion Bus	Scan Tool Does Not Communicate with Low Speed GMLAN Device DTC U0077
K43	Power Steering Control Module	High Speed GMLAN Chassis Expansion Bus	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 Expansion Bus	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
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
K109	Frontview Camera Module	Gateway Expansion High Speed GMLAN Low Speed GMLAN Object High Speed GMLAN	DTC U007B Scan Tool Does Not Communicate with Low Speed GMLAN Device DTC U0075
K111	Fuel Pump Driver Control Module	Powertrain Expansion Bus	DTC U0074
K114A / T6	Hybrid/EV Powertrain Control Module 1 / Power Inverter Module	High Speed GMLAN Chassis Expansion Bus Powertrain Expansion Bus	Scan Tool Does Not Communicate with High Speed GMLAN Device DTC U0077 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
K124	Active Safety Control Module	Low Speed GMLAN Gateway Expansion High Speed GMLAN Object High Speed GMLAN Chassis Expansion Bus	Scan Tool Does Not Communicate with Low Speed GMLAN Device DTC U007B DTC U0075 DTC U0077
K132	Pedestrian Alert Sound Control Module	Gateway Expansion High Speed GMLAN	DTC U007B
K177	Brake Booster Control Module	High Speed GMLAN Chassis Expansion Bus	Scan Tool Does Not Communicate with High Speed GMLAN Device DTC U0077
K182	Parking Assist Control Module	Low Speed GMLAN Chassis Expansion Bus	Scan Tool Does Not Communicate with Low Speed GMLAN Device DTC U0077
K188	Human Machine Interface Control Module Bypass Module	Local Interconnect Network (LIN)	DTC U1500-U15FF
M74D	Window Motor - Driver	Local Interconnect Network (LIN)	DTC U1500-U15FF
M75	Windshield Wiper Motor	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	DTC U007D DTC U0028
P17	Info Display Module	Gateway Isolated Low Speed GMLAN Local Interconnect Network (LIN)	DTC U007D 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	DTC U007D DTC U0028