Document ID: 5181674

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.

Data Link References
Code	Device	Data Link Type	Diagnostic Procedure
Schematic Reference: Data Communication 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
B75C	Multifunction Intake Air Sensor	Local Interconnect Network (LIN)	DTC U1500-U15FF
B80	Park Brake Switch	Local Interconnect Network (LIN)	DTC U1500-U15FF
B110	Battery Sensor Module	Local Interconnect Network (LIN)	DTC U1500-U15FF
B136	Exhaust Particulate Matter Sensor	Powertrain Sensor High Speed GMLAN	DTC U0076
B174W	Frontview Camera – Windshield	Gateway Expansion High Speed GMLAN Low Speed GMLAN	Scan Tool Does Not Communicate with Gateway Expansion High Speed GMLAN Device Scan Tool Does Not Communicate with Low Speed GMLAN Device
B195A	Nitrogen Oxides Sensor 1	Powertrain Sensor High Speed GMLAN	DTC U0076
B195B	Nitrogen Oxides Sensor 2	Powertrain Sensor High Speed GMLAN	DTC U0076
B195C	Nitrogen Oxides Sensor 3	Powertrain Sensor High Speed GMLAN	DTC U0076
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
G17	Heater Coolant Pump	Local Interconnect Network (LIN)	DTC U1500-U15FF
G58	Evaporative Emission Purge Pump	Local Interconnect Network (LIN)	DTC U1500-U15FF
G59	Engine Coolant Pump	Local Interconnect Network (LIN)	DTC U1500-U15FF
K4	Assist Step Control Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low 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
K17 / K160	Electronic Brake Control Module / Brake System Control Module	High Speed GMLAN Chassis High Speed GMLAN Local Interconnect Network (LIN)	Scan Tool Does Not Communicate with High Speed GMLAN Device Scan Tool Does Not Communicate with Chassis High Speed GMLAN Device DTC U1500-U15FF
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 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
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
K34	Glow Plug Control Module	High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
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
K40	Seat Memory Control Module	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 GMALN Chassis High Speed GMALN	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
K60	Steering Column Lock Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
K68	Trailer Lighting Control Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
K69	Transfer Case Control Module	High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
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	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
K89	Immobilizer Control Module	Local Interconnect Network (LIN)	DTC U1500-U15FF
K111	Fuel Pump Driver Control Module	Powertrain Sensor High Speed GMLAN	DTC U0076
K115	Reductant Control Module	High Speed GMLAN Powertrain Sensor High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device DTC U0076
K133	Trailer Brake Power Control Module	Local Interconnect Network (LIN)	DTC U1500-U15FF
K157	Video Processing Control Module	Gateway Isolated Low Speed GMLAN	Scan Tool Does Not Communicate with Gateway Isolated Low Speed GMLAN Device
K182	Parking Assist Control Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
K194	Pickup Box Endgate Control Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
K214	Trailer Tire Pressure Indicator Module	Gateway Isolated High Speed GMLAN	Scan Tool Does Not Communicate with Gateway Isolated High Speed GMLAN Device
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
M74D	Window Motor - Driver	Local Interconnect Network (LIN)	DTC U1500-U15FF
M74P	Window Motor - Passenger	Local Interconnect Network (LIN)	DTC U1500-U15FF
P16	Instrument Cluster	Gateway Isolated High Speed GMLAN Gateway Isolated Low Speed GMLAN Ethernet Bus Local Interconnect Network (LIN)	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 DTC U1500-U15FF
P29	Head-Up Display	Local Interconnect Network (LIN)	DTC U1500-U15FF
Q74	Engine Coolant Bypass Valve	Local Interconnect Network (LIN)	DTC U1500-U15FF
S32R	Seat Heating Switch - Rear	Local Interconnect Network (LIN)	DTC U1500-U15FF
S70R	Steering Wheel Controls Switch - Right	Local Interconnect Network (LIN)	DTC U1500-U15FF
S76	Trailer Brake Control Switch	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
T1	Accessory DC/AC Power Inverter Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
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