Information Bus: Description and Operation

The Class 2 serial data link allows modules to transmit, receive, or exchange data between each other:
^ HVAC module
^ Suspension Control Module (SCM)
^ Active Transfer Case (ATC)
^ Electronic Brake Control Module (EBCM)
^ Powertrain Control Module (PCM)
^ Transmission Control Module (TCM)
^ Vehicle Interface Unit (VIU)
^ Body Control Module (BCM)
^ Instrument Panel Cluster (IPC)
^ Driver Information Center (DIC)
^ Mirror Memory Module (MMM)
^ Memory Seat Module (MSM)
^ inflatable restraint Sensing And Diagnostic Module (SDM)

The Class 2 serial data link allows a scan tool to communicate with these modules for testing purposes, checking for DTCs, and to activate/enable/disable functions. These communication circuits are bussed together via a star connector which ensures continuity between the Class 2 communication circuits.

The DLC has a ground for the serial data signal exiting the scan tool.

The scan tool is also supplied battery positive voltage and ground at the DLC.