Information Bus: Description and Operation

The class 2 serial data link allows the following modules to communicate and share data with each other:
^ Body Control Module (BCM)
^ Electronic Brake Control Module (EBCM)
^ HVAC Control Module (W/CJ2)
^ Inflatable Restraint Sensing and Diagnostic Module (SDM)
^ Instrument Panel Cluster (IPC)
^ Powertrain Control Module (PCM)
^ Vehicle Interface Unit (VIU), if equipped

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

"For a description of the RPO Code(s) shown in this article or any of the images therein, refer to the RPO Code List found at Vehicle/Application ID". RPO Codes