Principles of Operation: Notes

NOTE: The instrument cluster (IC), message center (MC), front electronic module (FEM), rear electronic module (REM), remote emergency satellite cellular unit (RESCU), anti-lock braking system/traction control/stability assist module (ABS/TC), and the driver door module (DDM) must be reconfigured upon replacement. See MODULE CONFIGURATION .

The message center is part of the instrument cluster (10849). It uses a vacuum fluorescent display. The message center communicates with the PCM, FEM, REM, IC, ABS/TC/stability assist module, DDM, and the RESCU module over the SCP network. As a technician it is important to understand:

Where the input (command) originates from.
All information (messages) necessary in order for a feature to operate.
Which module(s) receive(s) the input or command message.
Does the module which received the input (message) control the output of the feature, or does it output a message over the SCP communication network to another module?
Which module controls the output of the feature.