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 Mid Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device DTC U0074 (Chassis Expansion Bus) , DTC U0074 (Mid Speed GMLAN) , DTC U0074 (Powertrain Expansion Bus)
A12	Digital Radio Receiver Control Module	Mid Speed GMLAN	DTC U0074 (Chassis Expansion Bus) , DTC U0074 (Mid Speed GMLAN) , DTC U0074 (Powertrain Expansion Bus)
A13	Rear Audio Control Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
A20	Radio/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
B119	Multi-axis Acceleration Sensor	Chassis High Speed GMLAN	Scan Tool Does Not Communicate with Chassis High Speed GMLAN Device
B191	Ultrasonic Receiver	Local Interconnect Network (LIN)	DTC U1500-U15FF
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 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
K27	Fuel Pump Control Module	High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
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
K29R	Seat Heating Control Module - Rear	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
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	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 Scan Tool Does Not Communicate with Chassis High Speed GMLAN Device
K60	Steering Column Lock Control 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	Transmission Control Module	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
K82	Mobile Telephone Control Module	Mid Speed GMLAN	DTC U0074 (Chassis Expansion Bus) , DTC U0074 (Mid Speed GMLAN) , DTC U0074 (Powertrain Expansion Bus)
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 Detection Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
K109	Frontview Camera Module	Object Bus	DTC U0075
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 Scan Tool Does Not Communicate with Chassis High Speed GMLAN Device 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
P4	Security Siren	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	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
T11	Multimedia Player Interface Module	Low Speed GMLAN Mid Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device DTC U0074 (Chassis Expansion Bus) , DTC U0074 (Mid Speed GMLAN) , DTC U0074 (Powertrain Expansion Bus)