GM Service Manual Online
For 1990-2009 cars only

Class 2 Serial Data Link

The Class  2 serial data link allows the following modules to communicate data with each other:

    • The body control module (BCM)
    • The electronic brake control module (EBCM)
    • The inflatable restraint sensing diagnostic module (SDM)
    • The instrument panel cluster (IPC)
    • The powertrain control module (PCM)

In addition, the Class 2 serial data link allows a scan tool to communicate with the modules for diagnostic and testing purposes. The Class 2 serial data link, for the scan tool, is located at the DLC connector.