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 Schematics

Code	Device	Data Link Type	Diagnostic Procedure
A11	Radio	Low Speed GMLAN MOST Bus	Scan Tool Does Not Communicate with Low Speed GMLAN Device DTC U0028
A26	HVAC Controls	Low Speed GMLAN Local Interconnect Network (LIN)	Scan Tool Does Not Communicate with Low Speed GMLAN Device DTC U1500-U15FF
A33	Media Disc Player	MOST Bus	DTC U0028
B67	Ultrasonic Intrusion Sensor	Local Interconnect Network (LIN)	DTC U1500-U15FF
B99	Steering Wheel Angle Sensor	Chassis High Speed GMLAN	Scan Tool Does Not Communicate with Chassis High Speed GMLAN Device
B117	Rain Sensor	Local Interconnect Network (LIN)	DTC U1500-U15FF
B129	Cruise Control Vehicle Distance Sensor 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
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
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
K16	Battery Energy Control Module	High Speed GMLAN Powertrain Expansion CAN (HP6)	Scan Tool Does Not Communicate with High Speed GMLAN Device DTC U0074 (Chassis Expansion Bus) , DTC U0074 (Powertrain Expansion Bus with HP6) , DTC U0074 (Powertrain Expansion Bus without HP6)
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
K18	Compass Module	Local Interconnect Network (LIN)	DTC U1500-U15FF
K19	Suspension 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 CAN (HP6)	Scan Tool Does Not Communicate with High Speed GMLAN Device DTC U0074 (Chassis Expansion Bus) , DTC U0074 (Powertrain Expansion Bus with HP6) , DTC U0074 (Powertrain Expansion Bus without HP6)
K29F	Seat Heating Control Module - Front	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
K38	Chassis Control Module	High Speed GMLAN	Scan Tool Does Not Communicate with High 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
K41R	Rear Parking Assist Control Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
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
K59	Starter/Generator Control Module	High Speed GMLAN Powertrain Expansion CAN (HP6)	Scan Tool Does Not Communicate with High Speed GMLAN Device DTC U0074 (Chassis Expansion Bus) , DTC U0074 (Powertrain Expansion Bus with HP6) , DTC U0074 (Powertrain Expansion Bus without HP6)
K62	Sunroof Sunshade Motor Module	Local Interconnect Network (LIN)	DTC U1500-U15FF
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 GMALN 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 GMALN MOST Bus	Scan Tool Does Not Communicate with High Speed GMLAN Device DTC U0028
K83	Parking 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
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
K96	Mirror Control Module	Local Interconnect Network (LIN)	DTC U1500-U15FF
K99	Steering Column Position 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
M69	Sunroof Motor	Local Interconnect Network (LIN)	DTC U1500-U15FF
M74D	Window Motor - Driver	Local Interconnect Network (LIN)	DTC U1500-U15FF
P2	Transmission Shift Lever Position Indicator	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
S48E	Multifunction Switch - Center Console	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	Low Speed GMLAN MOST Bus	Scan Tool Does Not Communicate with Low Speed GMLAN Device DTC U0028