Data Link References
This table identifies which serial data link that a particular module uses for in-vehicle data transmission. Some modules may use more than one data link to communicate. Some 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. 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 | ||
| Air Suspension Control Module (ASCM) Professional Vehicle w/ F38 | High Speed GMLAN | Scan Tool Does Not Communicate with High Speed GMLAN Device |
| Audio Amplifier | Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device |
| Automatic Level Control Module (ALCM) | High Speed GMLAN | Scan Tool Does Not Communicate with High Speed GMLAN Device |
| Auxiliary HVAC Control Module | Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device |
| Body Control Module (BCM) |
|
Scan Tool Does Not Communicate with High Speed GMLAN Device |
| Climate Control Seat Module (CCSM) w/ KB6 | Keyword 2000 | Scan Tool Does Not Communicate with Keyword Data Line |
| Digital Radio Receiver (DRR) | Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device |
| Distance Sensing Cruise Control (DSCC) Module | High Speed GMLAN | Scan Tool Does Not Communicate with High Speed GMLAN Device |
| Driver Door Module (DDM) / Driver Door Switch Assembly (DDSA) | Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device |
| Local Interconnect Network (LIN) | DTC U1500, U1511, U1512, or U1513 | |
| Driver Position (Memory Seat) Module | Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device |
| Electronic Brake Control Module (EBCM) | High Speed GMLAN | Scan Tool Does Not Communicate with High Speed GMLAN Device |
| Electronic Suspension Control Module (ESCM) | High Speed GMLAN | Scan Tool Does Not Communicate with High Speed GMLAN Device |
| Engine / Powertrain Control Module (ECM/PCM) | High Speed GMLAN | Scan Tool Does Not Communicate with High Speed GMLAN Device |
| Front Passenger Door Module (FPDM) | Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device |
| Local Interconnect Network (LIN) | DTC U1500, U1511, U1512, or U1513 | |
| Heated Seat Control Module - Rear w/KA6 | Low Speed GMLAN | Scan Tool Does Not Communicate with Low 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 (SDM) | Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device |
| Inside Rearview Mirror | Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device |
| Instrument Panel Cluster (IPC) | Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device |
| Onstar TTY Interface Module (This is a dealer-installed SPO accessory kit for hearing-impaired users of the Onstar system) | Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device |
| Passenger Presence System (PPS) | Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device |
| Radio | Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device |
| Remote Control Door Lock Receiver (RCDLR) | Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device |
| Side Blind Zone Alert (SBZA) Module, left | Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device |
| Side Blind Zone Alert (SBZA) Module, right | Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device |
| Television Tuner Module, w/ YQ6 or YQ7 | Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device |
| Theft Deterrent Module (TDM) | Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device |
| Transmission Control Module (TCM) | High Speed GMLAN | Scan Tool Does Not Communicate with High Speed GMLAN Device |
| Universal Park Assist (UPA) Module | Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device |
| Vehicle Communication Interface Module (OnStar) |
|
Scan Tool Does Not Communicate with Low Speed GMLAN Device |
| Vehicle Direction Alert Alarm (Lane Departure) Warning Module | Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device |
| Video Display | Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device |
| Window Motors (all) | Local Interconnect Network (LIN) | DTC U1500, U1511, U1512, or U1513 |