Principles of Operation: Notes

WARNING: This page is about a different car, the 2005 Mazda Tribute. However, it is still accessible from the selected car via links, so may be relevant.

The message center electronic functions use both hardwired and controller area network (CAN) circuits to transmit and receive information. It is very important to understand:

where the input (command) originates from.
all the 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 CAN circuits to another module?
which module controls the output of the feature.