Class 2 Serial Data Link

The class 2 serial data link allows these modules to communicate data with each other:
^ Body Control Module (BCM)
^ Driver Information Center (DIC)
^ Electronic Brake Control Module (EBCM)
^ Heads Up Display Module (HUD)
^ Instrument Panel Cluster (IPC)
^ PASS-Key(R) III (PK3)
^ Powertrain Control Module (PCM)
^ Radio
^ Inflatable Restraint Sensing Diagnostic Module (SDM)
^ Devices on the auxiliary power drop connector In addition, the class 2 serial data link allows a scan tool to communicate with these modules for diagnostic and testing purposes.