Data Link References
This table identifies which serial data link that a particular control module uses for in-vehicle data transmission. Some control modules may use more than one data link to communicate. Some control modules 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 control modules listed will be applicable to all vehicles. Refer to the schematics to determine which control modules apply. For the description and operation of these serial data communication circuits refer to Data Link Communications Description and Operation .
Data Link References
| Control Module | Data Link Type | Diagnostic Procedure |
|---|---|---|
| Schematic Reference: Data Communication Schematics | ||
| Body Control Module |
|
|
| Electronic Brake Control Module |
|
|
| Engine Control Module | High Speed GMLAN | Scan Tool Does Not Communicate with High Speed GMLAN Device |
| HVAC Control Module | Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device |
| Inflatable Restraint Sensing and Diagnostic Module | Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device |
| Instrument Cluster | Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device |
| Multi-axis Acceleration Sensor | Chassis High Speed GMLAN | Scan Tool Does Not Communicate with Chassis High Speed GMLAN Device |
| Power Steering Control Module | High Speed GMLAN | Scan Tool Does Not Communicate with High Speed GMLAN Device |
| Radio | Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device |
| Steering Wheel Angle Sensor | Chassis High Speed GMLAN | Scan Tool Does Not Communicate with Chassis High Speed GMLAN Device |
| Telematics Communication Interface Control Module |
|
|
| Transmission Control Module | High Speed GMLAN | Scan Tool Does Not Communicate with High Speed GMLAN Device |