Instrument Cluster
CAUTION: Do not ground either terminal of the instrument Voltage Regulator.DESCRIPTION
With the Ignition Switch in "RUN", the Instrument Cluster is powered through Fuses 7 and 18 of the Interior Fuse Panel.
The Fuel Gauge, Anti-Slosh Module, and Fuel Gauge Sender - make up the Fuel Indicating System. The sender is a variable resistor connected to a float in the fuel tank. When the duel is low, resistance is low (15 to 22.5 ohms); when fuel is high, resistance is high (145 to 150 ohms).
The Fuel Anti-Slosh Module - delays the signal to the Fuel Gauge to keep the Fuel Gauge form fluctuating during moments of excessive movement.
The Voltmeter - measures vehicle system voltage with the Ignition Switch in the "RUN" position.
The Charge Indicator - receives a charge signal from the Alternator/Regulator. The warning indicator will light when the charge at the Alternator falls below the normal operating range.
The Oil Pressure Gauge - is controlled by the Oil Pressure Switch. With normal oil pressure, the switch is closed and the gauge indicates a reading in the "NORMAL" range. With low oil pressure, the switch opens and the gauge indicates a "LOW" reading.
The Coolant Temperature Gauge - connects to the Coolant Temperature Sender. The sender is a temperature-sensitive variable resistor. When the coolant temperature is low, resistance is high (74 ohms); when the coolant is high, resistance is low (9.7 ohms).
The Warning/Message Indicators - below are controlled by their respective switches and modules. The Instrument Cluster acts only as a display.
- AMP Indicator
- Air Bag Indicator
- Anti-Lock Indicator
- Brake Warning Indicator
- Check Engine Indicator
- Fasten Seat Belt Indicator
- High Beam Indicator
- Left Turn Indicator
- Right Turn Indicator
The Illumination Lamps - receive power from the 19 (LB/R) wire. The intensity of the Illumination Lamps can be varied. The 19 (LB/R) circuit is energized when the Main Light Switch is in "PARK" or "HEAD".
The Programmable Speedometer/Odometer Module (PSOM) - receives its input form the Rear Anti-Lock Brake Sensor. The Liquid Crystal Display (LCD) odometer is a combination trip odometer and total odometer. Normally displayed is the total odometer. Pressing the "SELECT" button on the upper right side of the Speedometer will display the trip-odometer. Pressing the "RESET" button while the trip-odometer is displayed will zero out the trip-odometer.
The Speedometer is also used to provide a speed signal for the EEC Module and Speed Control System.
NOTE: The Programmable Speedometer/Odometer Module (PSOM) is serviceable only as an entire cluster assembly. It is important to keep the speedometer face-up since speedometer function will be affected by storage in the face-down position.