Principles of Operation: Notes

The message center is an integral part of the instrument cluster. The message center communicates with the powertrain control module (PCM), front electronic module (FEM), rear electronic module (REM), and anti-lock brake system (ABS)/traction control (TC)/stability assist 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.