General System Description

When replaceing a speedometer or odometer assembly, the law requires that the odometer reading of the replacement unit to be set to register the same milage as the prior odometer. Check with state laws to insure proper compliance.

See the circuit referred to for the complete operation of an indicator and the other components that work with it. Only the indicators that do not appear in other schematics are described in this section.

The instrument panel is designed to permit the removal of control switches from the drivers side. The standard instrument panel is equipped with warning lamps for critical vehicle and engine operations. The optional instrument panel is equipped with gauges. There is also an electronic digital instrument cluster that uses blue and green vacuum fluorescent displays.

The digital electronic instrument panel uses standard bulbs for the turn lamp indicator, safety belt lamp, service engine soon lamp, headlamp high beam indicator and shift lamp (on manual transmission).

Battery power to the cluster is supplied by PNK/WHT(39) and GRY(8) wires. These circuits power the vacuum fluorescent displays and provide power to the brake and service engine soon lights and the voltmeter.

The other circuits to the cluster provide the various signals necessary to operate the displays and indictors.

When the ignition switch is turned to run, all of the segments of the vacuum fluorescent displays are displayed for about 2 seconds. The displays then display the current value.


The vehicle speed sensor generates a signal that indicates the speed of the vehicle. The signal is processed by the solid state Digital Ratio Adapter to supply inputs to the Electronic Control Module (ECM), the cruise control, the rear wheel anti-lock brake module (RWAL), and the speedometer.