Indicators Cluster

OIL PRESSURE INDICATOR

With the Ignition Switch in the "RUN", "BULB TEST", or "START" position, battery voltage from Fuse 17 is applied to one side of the Oil Pressure 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/Oil Pressure Switch to the Oil Pressure Indicator and the bulb lights.

"LOW OIL LEVEL" INDICATOR

The "LOW OIL LEVEL" Indicator ground is controlled by the Low Oil Module. To check for a low oil condition, the 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 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 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 Low Oil Module loses the ground through the Oil Level Sensor/Switch (Oil Level Sensor/Switch open indicating low oil level) the Low Oil Module grounds the "LOW OIL LEVEL" Indicator for the duration of the next ignition cycle.

COOLANT TEMPERATURE INDICATOR

The Coolant Temperature Indicator comes "ON" to warn the driver of high coolant temperature.
With the Ignition Switch in "RUN", "BULB TEST" or "START", voltage from Fuse 17 is applied to the Coolant Temperature 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/Sender which contains a switch that closes when the coolant temperature exceeds 126°C (258°F) completing path to ground which turns "ON" the Coolant Temperature Indicator.

"GATE AJAR" INDICATOR

Voltage is applied at all times to the "GATE AJAR" Indicator from Fuse 2. When the Tailgate is opened, the Tailgate Ajar Switch closes, completing the path to ground which turns "ON" the "GATE AJAR" Indicator at the Instrument Cluster.

"DOOR OPEN" INDICATOR (SEO ONLY)

With the Igntion Switch in the "RUN", "BULB TEST", or "START" position, battery voltage from Fuse 17 is applied to one side of the "DOOR OPEN" Indicator Lamp in the Instrument Cluster. When a door is opened, the Door Jamb Switch closes, completing path to ground which turns "ON" the Indicator.

FUEL GAGE

The pointer of the Fuel Gage is moved by the magnetic fields of two coils. The coils are at right angles to each other. With the Ignition Switch in the "RUN", "BULB TEST", or "START" position, battery voltage is applied from Fuse 17 to the E coil of the Fuel Gage. The circuit divides at the opposite (ground) side of the coil. One path seeks a ground through the F coil of the Fuel Gage and the other path seeks a ground through the variable resistor in the Fuel Gage Sender.
When fuel level is high, resistance in the Fuel Gage Sender is high. Since voltage will always seek the path of leas resistance, voltage will flow through the E coil and the F coil to ground at G200. Since the length of the F coil winding is approximately twice the length of the E coil winding, the magnetic field generated by the coil is twice as strong as the magnetic field generated by the E coil. Therefore, the pointer will be pulled to the "F" position.
When fuel level is low, resistance in the Fuel Gage Sender is low. In this condition, current will flow directly through the E coil and the Fuel Gage Sender to ground. Therefore, the pointer will be pulled to the "E" position.

COOLANT TEMPERATURE GAGE

The pointer of the Coolant Temperature Gage is moved by the magnetic fields of two coils. The coils are at right angles to each other. With the Ignition Switch in the "RUN", "BULB TEST", or "START" position, battery voltage from Fuse 17 is applied to both coils of the Coolant Temperature Gage. The circuit divides at the power side of the coil. One path seeks a ground at G200 through the C coil and the other path seeks a ground through the H coil and the variable resistor in the Coolant Temperature Switch/Sender. When coolant temperature is low, resistance in the Coolant Temperature Switch/Sender is high. Since voltage will always seek the path of least resistance, voltage will always flow through the C coil to ground at G200. Therefore, the pointer will be pulled to the "C" position.
As coolant temperature increases, resistance in the Coolant Temperature Switch/Sender decreases. Since voltage will always seek the path of least resistance, more voltage will begin to bypass the H coil and travel directly to ground through the Coolant Temperature Switch/Sender. The length of the H coil winding is approximately twice the length of the C coil winding, so the magnetic field generated by the H coil is twice as strong as the magnetic field generated by the C coil. Under these conditions, the H coil magnetic field becomes stronger than the C coil magnetic field and the pointer moves toward the "H" position.