Circuit Operation

Class 2 data is transmitted at a higher speed and messages are configured differently than UART data. While UART uses a "master" to control serial data line traffic, Class 2 uses the "peer to peer" method along with message arbitration to manage data line traffic. The control modules on the Class 2 data line are:
^ Active Audio Amplifier (AMP)
^ Body Control Module (PZM)
^ Climate Control Panel (CCP)
^ Continuously Variable Road Sensing Suspension (CVRSS) Module
^ Electronic Brake and Traction Control Module (EBTCM)
^ Heater and A/C Programmer (ACM)
^ Instrument Panel Cluster (IPC)
^ Integrated Radio Controller (IRC)
^ Memory Seat Module (MSM)
^ Memory Mirror Module (MMM)
^ Powertrain Control Module (PCM)
^ Remote Function Actuator (RFA)
^ Sensing and Diagnostic Module (SDM)
^ Transmit-Receive Unit (PHN)
^ Vehicle Interface Unit (VIM) Module