Principles of Operation (How Does It Work)

NOTE: The Instrument Cluster (IC), Front Electronic Module (FEM), and the Rear Electronic Module (REM) must be reconfigured upon replacement. REFER to Module Communications Network (Information Bus).

The instrument cluster (IC) 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. As a technician it is very 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

The instrument cluster communicates to the FEM, REM, ABS/TC, PCM and other modules on the vehicle, over the SCP to control the gauges and warning indicators.