Electronic Instrument Cluster

The Electronic Instrument Cluster (EIC) is easily distinguished from the mechanical instrument cluster by its digital and linear displays.

The electronic cluster includes a digital speedometer, odometer, oil pressure gauge, coolant temperature gauge, fuel gauge, and voltage gauge. It also has a series of warning indicator lamps to provide the driver with all the necessary information to ensure that the vehicle is in perfect operating condition.

The electronic cluster receives virtually all of the information for its displays from the body controller and the engine controller via the CCD multiplex system.

The electronic cluster has two forms of diagnostic routines that are used to isolate problems within the cluster. Self-diagnostics use the TRIP and TRIP RESET buttons for access, and COD bus diagnostic routines require the use of the DRBII diagnostic readout box.

Successful completion of the self-diagnostic test indicates that the problem is in the CCD bus, interfacing modules, connectors, wiring harnesses, or sensors outside the cluster. (For connector pinouts, see HELP 3 Inspection of Electrical Connectors.)

In these vehicles, the body controller (not the Electronic Instrument Cluster) stores the odometer information that is displayed on the instrument cluster. Therefore, when replacement of the electronic cluster is required, the odometer reading will not be affected. (See the "Body Controller" description found earlier in this section.)