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
A12	Digital Radio Receiver Control Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
B136	Exhaust Particulate Matter Sensor	Powertrain Expansion Bus	DTC U0074
B195A	Nitrogen Oxides Sensor 1	Powertrain Expansion Bus	DTC U0074
B195B	Nitrogen Oxides Sensor 2	Powertrain Expansion Bus	DTC U0074
E19	Coolant Heater	High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
K9	Body 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
K17	Electronic Brake Control Module	High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
K18	Compass Module	Local Interconnect Network (LIN)	DTC U1500, U1511, U1512, or U1513
K20	Engine Control Module	High Speed GMLAN Powertrain Expansion Bus	Scan Tool Does Not Communicate with High Speed GMLAN Device DTC U0074
K34	Glow Plug Control Module	High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
K36	Inflatable Restraint Sensing and Diagnostic Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
K41R	Rear Parking Assist Control Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
K64	Content Theft Deterrent Control Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
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
K77	Remote Control Door Lock Receiver	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
K103	Fuel Injector Control Module	High Speed GMLAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
K115	Reductant Control Module	Powertrain Expansion Bus	DTC U0074
P5	Chime Alarm Control Module	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device
P16	Instrument Cluster	Low Speed GMLAN	Scan Tool Does Not Communicate with Low Speed GMLAN Device