GM Service Manual Online
For 1990-2009 cars only

Class 2 Serial Data Link

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

    • Body Control Module (BCM)
    • Driver Information Display Module
    • Driver Seat Adjuster Memory Module
    • Electronic Brake Control Module (EBCM)
    • Inflatable Restraint Sensing and Diagnostic Module (SDM)
    • Instrument Cluster
    • Powertrain Control Module (PCM) / Vehicle Control Module (VCM)
    • Transfer Case Shift Control Module
    • Vehicle Interface Unit (VIU)

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