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Electro-Mechanical Instrument Cluster (EMIC)

The instrument cluster controls the courtesy lamps. It receives and sends messages to other modules via the PCI bus circuit. It controls all the instrument illumination and the chime is also an integral part of the cluster.

All gauges are the analog type. When the ignition switch is moved to the OFF position, the cluster drives each gauge to its lowest position. The individual gauges are not serviceable and require complete replacement of the cluster if one or more gauges are inoperable.

One button is used to switch the display from trip to total mileage. Holding the button when the display is in the trip mode will reset the trip mileage. This button is also used to put the cluster in self-diagnostic mode. Most of the indicators will come on briefly for a bulb check when the ignition switch is turned from OFF to ON position. The LED's are non serviceable and if one or more warning indictor LED's are out, the entire cluster must be replaced.

In the event that the instrument cluster looses communication with all other modules on the PCI bus, the cluster will display "nobuS" in the VF display. The VF display also displays "Door", "Cruise", "Trac", and odometer trip or total.

If the cluster does not detect voltage on the courtesy lamp circuit, the message "FUSE" will alternate with the odometer/trip odometer. The lack of voltage can be due to the M1 fused B+ (IOD) fuse being open, or a circuit problem.

Indicator lamps use ON/OFF switch functions for operation, while gauges use a sending unit or sensor. The instrument cluster will learn some features of the vehicle that it is installed in so swapping clusters from vehicle to vehicle is not recommended. The features that are learned are:

The gauges are the magnetic air-core type. When the ignition switch is turned to OFF position, the gauge pointers should rest at or below the lowest graduation. The instrument cluster may be checked quickly by using the cluster self-diagnostics. See SELF-DIAGNOSTICS . After bulb check, (with the key in the RUN position and engine running) all module warning indicators should be extinguished. If any of these indicators stay ON, use the DRBIII scan tool to determine module faults. Also, see INSTRUMENT CLUSTER under SYSTEM TESTS in BODY CONTROL MODULES article, for system tests.

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