Information Bus: Description and Operation

DATA LINK CONNECTOR (DLC)
The data link connector (DLC) terminal 2 contains the class 2 serial data link.
The DLC also provides a power source for the scan tool as follows:
^ Battery voltage at the DLC terminal 6 (circuit 440).
^ Ground at terminal 4 (circuit 50) and terminal 5 (circuit 45).

CLASS 2 SERIAL DATA LINK
^ The class 2 serial data link allows the following modules to communicate with each other:
^ The Body Control Module (BCM)
^ The Electronic Brake Control Module (EBCM)
^ The Instrument Panel Cluster (IPC)
^ The Powertrain Control Module (PCM)
^ The Inflatable Restraint Sensing And Diagnostic Module (SDM)

The class 2 serial data link allows a scan tool to communicate with the above modules for diagnostic and testing purposes.