Principles of Operation

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

NOTE: The instrument cluster, the front electronic module (FEM), and the rear electronic module (REM) must be reconfigured upon replacement. Refer to MODULE CONFIGURATION .

NOTE: The diagnostic tool may display ICM for the instrument cluster.

NOTE: For any concerns with the restraint control module (RCM), refer to SUPPLEMENTAL RESTRAINT SYSTEM .

The instrument cluster is a hybrid electronic instrument cluster (HEC). The vehicle electronic functions are divided into zones. The instrument cluster, FEM, and REM use the standard corporate protocol (SCP) communication network to transmit and receive information. It is very important to understand:

where the input (command) originates
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

The instrument cluster communicates with the FEM, the REM, the anti-lock brake system (ABS) module, the powertrain control module (PCM), the steering column lock, the message center, and the RCM over the SCP to control the gauges, indicators, and chimes.