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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 .

Control Module

Data Link Type

Diagnostic Procedure

Schematic Reference:Data Communication Schematics

Engine Control Module (ECM)

    •  KWP2000 (for communication with scan tool)
    •  CAN (for communication with TCM)

Scan Tool Does Not Communicate with Keyword Data Line

Electronic Brake Control Module (EBCM)

High Speed GMLAN

Scan Tool Does Not Communicate with Keyword Data Line

Inflatable Restraint Sensing and Diagnostic Module (SDM)

High Speed GMLAN

Scan Tool Does Not Communicate with Keyword Data Line

Immobiliser Control Module

KWP2000

Scan Tool Does Not Communicate with Keyword Data Line

Instrument Panel Cluster (IPC)

High Speed GMLAN

Scan Tool Does Not Communicate with Keyword Data Line

Keyless Entry Control Module (RES)

KWP2000

Scan Tool Does Not Communicate with Keyword Data Line

Transmission Control Module (TCM)

    •  KWP2000 (for communication with scan tool)
    •  CAN (for communication with ECM)

Scan Tool Does Not Communicate with Keyword Data Line

   


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