Class 2 Serial Data Link

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