Class 2 Serial Data Link

The data link is configured as a ring with discrete lines entering and leaving each module. This allows communications to the modules on the ring if one of the two discrete circuits is open

A total list of the control modules on the Class 2 Serial Data Line can include the following:
^ Powertrain Control Module (PCM)
^ Electronic Brake Control Module (EBCM)
^ Remote Function Actuator (RFA)
^ Inflatable Restraint Sensing and Diagnostic Module (SDM)
^ Memory Seat Module (MSM) with A43
^ Heater and AC Programmer Module (HCM)
^ Instrument Cluster (IPC)
^ Pass-key(R) III Vehicle Theft Deterrent Module (VTD)
^ Driver Door Module (DDM)
^ Body Control Module (SBM)