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 wiring 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 Wiring Schematics
A11	Radio	High Speed CAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
B99	Steering Wheel Angle Sensor	High Speed CAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
K9	Body Control Module	High Speed CAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
K17	Electronic Brake Control Module	High Speed CAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
K20	Engine Control Module	High Speed CAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
K36	Inflatable Restraint Sensing and Diagnostic Module	High Speed CAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
K43	Power Steering Control Module	High Speed CAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
K65	Tire Pressure Indicator Module	High Speed CAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
K71	Transmission Control Module	High Speed CAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
P16	Instrument Cluster	High Speed CAN	Scan Tool Does Not Communicate with High Speed GMLAN Device
X50A	Fuse Block - Underhood	High Speed CAN	Scan Tool Does Not Communicate with High Speed GMLAN Device