Instrument Panel Cluster (IPC)

DIGITAL CLUSTER
The Digital Instrument Panel Cluster uses vacuum fluorescent displays to show Fuel Gage, vehicle speed, Odometer, Trip Odometer, Turn Signal Indicators and HI Beam Indicator. With the Ignition Switch in "RUN," current flows from I/P Fuse Block Fuse #18 - CCM IGN, to connector C1 terminal "A5" of the Digital Instrument Panel Cluster. For 2 seconds the entire display lights up to check all segments. After the segment check, only the operating data is displayed.

SPEEDOMETER AND ODOMETERS
The Digital Instrument Panel Cluster receives a speed signal from the Vehicle Speed Sensor through the Vehicle Speed Sensor Buffer. The frequency of the signal is related to the vehicle speed. The cluster contains a microprocessor which converts the speed signal into vehicle speed and mileage for the Speedometer and Odometer displays. The mileage figures are stored in the cluster's nonvolatile memory which retains information without the need for memory power. The driver can use the "ENG/MET" Switch to display speed and distance in English (mph and miles) or metric (km/h and kilometers).

"TRIP SET" SWITCH
The "TRIP SET" Switch is located in the Digital Instrument Panel Cluster. When the switch is set, a grounding input is provided to the display boards in the cluster which causes the Trip Odometer to reset.

"ENG/MET" SWITCH
The "ENG/MET" Switch is located in the Digital instrument Panel Cluster. When the switch is pressed, a grounding input is provided to the display boards inside the cluster which causes an English/Metric mode change.

DISPLAY ILLUMINATION
The Digital Instrument Panel Cluster vacuum fluorescent display is automatically dimmed when the Headlight Switch is pulled to "PARK" or "HEAD."

This is accomplished by applying voltage to connector C1 terminal "A1" of Digital Instrument Panel Cluster. With the Headlight Switch "OFF," the vacuum fluorescent display is at maximum intensity. When the Headlight Switch is in "PARK" or "HEAD," the display can be dimmed further by rotating the Headlight Switch knob. The Headlight Switch knob controls the lighting rheostat which sends a variable voltage to the cluster at connector C1 terminal "A2" of Digital Instrument Panel Cluster. The display intensity is proportional to the voltage supplied by the rheostat.

FUEL GAGE
The Fuel Gage uses vacuum fluorescent display to show fuel level. The Fuel Tank Unit is a variable resistor that sends a variable voltage to Fuel Gage through the PPL CKT (30) wire. When the fuel level is high, resistance in the Fuel Tank Unit is also high (80 ohms when full). As fuel level decreases, resistance in the Fuel Tank Unit also decreases (0 ohms at empty).

COOLANT "TEMP" INDICATOR
The Coolant "TEMP" Indicator comes "ON" to warn the driver of high coolant temperature. With the Ignition Switch in "RUN," "BULB TEST" or "START," voltage from I/P Fuse Block Fuse 11 is applied to the Coolant "TEMP" Indicator. In "BULB TEST" or "START," the lamp is grounded through the Ignition Switch so that the bulb can be tested. In "RUN," the current path is completed through the Coolant Temperature Switch which contains a switch that closes when the coolant temperature exceeds 126°C (258°F) completing path to ground which turns "ON" the Coolant "TEMP" Indicator.

"DOOR AJAR" INDICATOR
With the Ignition Switch in the "RUN," "BULB TEST," or "START" position, battery voltage from I/P Fuse Block Fuse 11 is applied to one side of the "DOOR AJAR" Indicator Lamp in the Instrument Cluster. When a Door is opened, the Mini Wedge Switch closes, completing path to ground which turns "ON" the indicator.

OIL "PRESSURE" WARNING INDICATOR
With the ignition Switch in the "RUN," "BULB TEST," or "START" position, battery voltage from I/P Fuse Block Fuse 11 is applied to one side of the Oil "PRESSURE" Warning Indicator in the instrument Cluster. If Engine oil pressure should fall below 28 kPa (4 psi), the Fuel Pump/Oil Pressure Switch closes. With this switch closed, a ground path is provided by the Fuel Pump and Engine Oil Pressure indicator Switch to the Oil "PRESSURE" Warning Indicator and the bulb lights.

"LOW OIL LEVEL" INDICATOR
The "LOW OIL LEVEL" indicator ground is controlled by the Engine Low Oil Module. To check for a low oil condition, the Engine Low Oil Module looks for a ground through the Oil Level Sensor/Switch after the Ignition Switch has been turned to "OFF" or "LOCK."

The Engine Low Oil Module checks for a low oil condition 32 minutes after the Ignition Switch is turned to "OFF" or "LOCK," if the previous ignition cycle was less than twelve minutes. If the previous ignition cycle was longer than twelve minutes, the Engine Low Oil Module checks for a low oil condition three minutes after the Ignition Switch is turned to "OFF" or "LOCK."

The bulb test takes four to five seconds and is independent of a ground through the Oil Level Sensor/Switch. The bulb test occurs every time the Ignition Switch is turned "ON."

When the Engine Low Oil Module loses the ground through the Oil Level Sensor/Switch (Oil Level Sensor/Switch open indicating low oil level) the Engine Low Oil Module grounds the "LOW OIL LEVEL" Indicator for the duration of the next ignition cycle.

"LOW COOLANT" INDICATOR
The "LOW COOLANT" Indicator has its ground controlled through the Low Coolant Module. The module uses the varying resistance in the Low Coolant Probe to determine if a low coolant condition is present. If a low coolant condition is present, the module will ground CKT 69, turning "ON" the indicator.

WINDSHIELD "WASHER FLUID LOW" LEVEL INDICATOR
The Windshield Washer Fluid Tank has a Windshield Washer Fluid Level Switch which closes when the washer fluid level becomes low. When the Windshield Washer Switch is turned to "ON," voltage is applied to both Windshield Washer Motor and Windshield Washer Fluid Level Switch. If washer fluid level is low and Windshield Washer Fluid Level Switch is closed, voltage is applied to the Windshield "WASHER FLUID LOW" Level Indicator. With the indicator permanently grounded to CKT 1500, the indicator will be turned "ON."