Principles of Operation: Notes

WARNING: This page is about a different car, the 2007 Lincoln MKX and 2007 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.

The instrument cluster uses inputs that are both hardwired to individual components and messages that are sent from the other modules over the high speed or medium speed controller area networks (HS-CAN or MS-CAN) to control the warning chime functions.

It is very important to understand:

where the input (command) originates.
all the information (messages) necessary in order for a feature to operate.
which module(s) receive(s) the input or command message.
if the module that received the input (message) controls the output of the feature, or if it outputs a message over the CAN to another module.
which module controls the output of the feature.