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	Scan Tool Does Not Communicate with Low Speed GMLAN Device
A26	HVAC Controls	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
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
B174	Frontview Camera	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	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
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	Scan Tool Does Not Communicate with High Speed GMLAN Device
K29	Seat 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
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
K41	Front and Rear Parking Assist Control 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
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
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
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
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
P16	Instrument Cluster	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
P17	Info Display Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
P29	Head-Up Display	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
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