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 .

Code	Device	Data Link Type	Diagnostic Procedure
Schematic Reference: Data Communication Schematics
A11	Radio	Low Speed GMLAN MOST Bus Local Interconnect Network (LIN)	Scan Tool Does Not Communicate with Low Speed GMLAN Device DTC U0028 DTC U1500-U15FF
A33	Media Disc Player	Low Speed GMLAN MOST Bus	Scan Tool Does Not Communicate with Low Speed GMLAN Device DTC U0028
B60	Passenger Presence Sensor	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
B99	Steering Wheel Angle Sensor	Chassis High Speed GMLAN	DTC U0077
B119	Multi-axis Acceleration Sensor	Chassis High Speed GMLAN	DTC U0077
B158	Vehicle Direction Camera	Object Bus	DTC U0075
B177	Rain/Ambient Light Sensor Module	Local Interconnect Network (LIN)	DTC U1500-U15FF
B191	Ultrasonic Receiver	Local Interconnect Network (LIN)	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 Bus	DTC U0075
B233LF	Radar Sensor Module - Short Range Left Front	Object Bus	DTC U0075
B233RF	Radar Sensor Module - Short Range Right Front	Object Bus	DTC U0075
B233R	Radar Sensor Module - Short Range Rear	Object Bus	DTC U0075
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 Expansion Bus	Scan Tool Does Not Communicate with High Speed GMLAN Device DTC U0074 (Chassis Expansion Bus) DTC U0074 (Powertrain Expansion Bus)
K28	Headlamp Leveling Control Module	High Speed GMLAN Local Interconnect Network (LIN)	Scan Tool Does Not Communicate with High Speed GMLAN Device DTC U1500-U15FF
K29F	Seat Heating Control Module - Front	Local Interconnect Network (LIN)	DTC U1500-U15FF
K29R	Seat Heating Control Module - Rear	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
K31	Navigation Control Module	Low Speed GMLAN Local Interconnect Network (LIN)	Scan Tool Does Not Communicate with Low Speed GMLAN Device 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
K33A	HVAC Control Module - Auxiliary	Local Interconnect Network (LIN)	DTC U1500-U15FF
K36	Inflatable Restraint Sensing and Diagnostic Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
K39	Liftgate Control Module	Low Speed GMLAN	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
K41	Front and Rear Parking Assist Control Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low 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 DTC U0077
K60	Steering Column Lock Module	Low Speed GMLAN	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
K68	Trailer Lighting Control Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
K71 / Q8	Transmission Control Module / Control Solenoid Valve Assembly	High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
K73	Telematics Communication Interface Control Module	High Speed GMLAN Low Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device Scan Tool Does Not Communicate with Low Speed GMLAN Device
K74	Human Machine Interface Control Module	High Speed GMLAN MOST Bus Local Interconnect Network (LIN)	Scan Tool Does Not Communicate with High Speed GMLAN Device DTC U0028 DTC U1500-U15FF
K83	Park Brake Control Module	High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
K84	Keyless Entry Control 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
K96	Mirror Control Module	Local Interconnect Network (LIN)	DTC U1500-U15FF
K109	Frontview Camera Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
K111	Fuel Pump Driver Control Module	Powertrain Expansion Bus	DTC U0074 (Chassis Expansion Bus) DTC U0074 (Powertrain Expansion Bus)
K124	Active Safety Control Module	High Speed GMLAN Chassis High Speed GMLAN Object Bus Low Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device DTC U0077 DTC U0075 Scan Tool Does Not Communicate with Low Speed GMLAN Device
M3L	Headlamp Horizontal Motor - Left	Local Interconnect Network (LIN)	DTC U1500-U15FF
M3R	Headlamp Horizontal Motor - Right	Local Interconnect Network (LIN)	DTC U1500-U15FF
M29L	Headlamp Leveling Actuator - Left	Local Interconnect Network (LIN)	DTC U1500-U15FF
M29R	Headlamp Leveling Actuator - Right	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
P2	Transmission Shift Lever Position Indicator	Local Interconnect Network (LIN)	DTC U1500-U15FF
P4	Security Siren	Local Interconnect Network (LIN)	DTC U1500-U15FF
P16	Instrument Cluster	Low Speed GMLAN MOST Bus Local Interconnect Network (LIN)	Scan Tool Does Not Communicate with Low Speed GMLAN Device DTC U0028 DTC U1500-U15FF
P17	Info Display Module	Low Speed GMLAN Local Interconnect Network (LIN)	Scan Tool Does Not Communicate with Low Speed GMLAN Device 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	Low Speed GMLAN MOST Bus	Scan Tool Does Not Communicate with Low Speed GMLAN Device DTC U0028