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
A21	Radio/HVAC Controls - Auxiliary	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
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	Low Speed GMLAN MOST Bus	Scan Tool Does Not Communicate with Low Speed GMLAN Device DTC U0028
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
E13LA	Headlamp Assembly - Left	Local Interconnect Network (LIN)	DTC U1500-U15FF
E13RA	Headlamp Assembly - Right	Local Interconnect Network (LIN)	DTC U1500-U15FF
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
K14	Distance Sensing Cruise 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
K16	Battery Energy Control Module	High Speed GMLAN Powertrain Expansion Bus (with 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) (with 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
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 Bus (with HP6) Powertrain Expansion Bus (without 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) (with HP6) DTC U0074 (Chassis Expansion Bus) DTC U0074 (Powertrain Expansion Bus with HP6) DTC U0074 (Powertrain Expansion Bus without HP6) (without HP6)
K26	Headlamp 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	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
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 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
K47	Rear Differential Clutch 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
K59	Starter/Generator Control Module	High Speed GMLAN Powertrain Expansion Bus (with 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) (with HP6)
K61	Sunroof Control Module	Local Interconnect Network (LIN)	DTC U1500-U15FF
K62	Sunroof Sunshade Motor Module	Local Interconnect Network (LIN)	DTC U1500-U15FF
K71 / T12	Transmission Control Module / Automatic Transmission 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
K78	Head-Up Display Module	Local Interconnect Network (LIN)	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
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
K109	Frontview Camera 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
K111	Fuel Pump Driver Control Module	Powertrain Expansion Bus (without HP6)	DTC U0074 (Chassis Expansion Bus) DTC U0074 (Powertrain Expansion Bus with HP6) DTC U0074 (Powertrain Expansion Bus without HP6) (without HP6)
M74D	Window Motor - Driver	Local Interconnect Network (LIN)	DTC U1500-U15FF
M74LR	Window Motor - Left Rear	Local Interconnect Network (LIN)	DTC U1500-U15FF
M74P	Window Motor - Passenger	Local Interconnect Network (LIN)	DTC U1500-U15FF
M74RR	Window Motor - Right Rear	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
P29	Head-Up Display	Local Interconnect Network (LIN)	DTC U1500-U15FF
S52	Outside Rearview Mirror Switch	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
S136	Infotainment Control Touchpad	Low Speed GMLAN MOST Bus	Scan Tool Does Not Communicate with Low Speed GMLAN Device DTC U0028
T3	Audio Amplifier	Low Speed GMLAN MOST Bus	Scan Tool Does Not Communicate with Low Speed GMLAN Device DTC U0028