Information Bus: Description and Operation

Data Link Connector (DLC)
The DLC provides a power source for the scan tool as follows:
^ Unswitched voltage (B+) at DLC terminal 16 (circuit 540)
^ Ground at terminal 4 (circuit 650) and terminal 5 (circuit 451)

Class 2 Serial Data Link
The class 2 serial data link allows the following modules to communicate data with each other:
^ Electronic brake control module (EBCM)
^ Instrument cluster (IC)
^ Powertrain control module (PCM)
^ 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. The Class 2 serial data link is located at the DLC connector terminal 2.