Standard

The Instrument Cluster contains gauges and warning indicators to keep the driver informed about the vehicle's systems. When the park lamps or headlamps are turned on, the gauges are illuminated.

Speedometer Assembly

The Speedometer Assembly includes the Speedometer, the Odometer and the Trip Odometer. All three are electronically controlled by a solid-state device that uses an input signal from the Vehicle Speed Sensor (VSS).

The Speedometer Assembly (-17282-) is serviceable only as a unit. It is important to keep the speedometer face up, as speedometer function will be affected by storage in the face down position.

Temperature and Fuel Level Gauges

Both the Temperature Gauge and the Fuel Gauge are magnetic gauges. With this type of gauge, the gauge needle "balance" between two magnetic fields that are present inside the gauge. One of these fields remains at a constant strength. The other field varies in strength according to current flow through the field's winding. current flow through the winding is determined by gauge sender resistance. With low sender resistance, current flow through the coil is low; with high sender resistance, current flow through the coil is low; with high sender resistance, current flow through the coil is high.

Temperature Gauge

The Coolant Temperature Sender determines current flow through the Temperature Gauge coil. With low coolant temperature, Sender resistance is high (about 73 ohms with a cold engine) and current flow is high. The needle points to "C". As coolant temperature increased, Sender resistance decreases (to about 10 ohms with a hot engine) and current flow decreases. The needle moves toward "H."

Fuel Gauge/Low Fuel Indicator

The Fuel Gauge Sender determines current flow through the Fuel Gauge coil. With a full fuel tank, Sender resistance is high (about 145 ohms) and current flow is high. The needle points to "F." As the fuel level drops, Sender resistance decreases (to about 23 ohms with an empty tank) and current flow decreases. The needle mover toward "E."

The Fuel Gauge Sender signal is filtered by the Anti-slosh Module to prevent excessive Fuel Gauge pointer movement due to fuel sloshing around in the tank.

Warning Indicators

With the Ignition Switch in START or RUN, voltage is present at the Air Bag, Anti-lock Brakes, Brakes, Check Engine and Oil Pressure Indicator bulbs through Fuse 4 and circuit 295 (LB/PK). The bulb for each indicator is grounded under the conditions described below.

Air Bag Indicator

If an Air Bag System fault is present, the Air Bag Diagnostic Module grounds pin 4. Current flows through Fuse 4, the Air Bag Indicator and the Air Bag Diagnostic Module to ground, and the indicator illuminates.

Anti-lock Brakes Indicator

If an Anti-lock Brakes System fault is present, the Anti-lock Brake Module grounds pin 52. Current flows through Fuse 4, the Anti-lock Brakes Indicator and the Anti-lock Brake Module to ground, and the indicator illuminates.

Brake Indicator

With a low brake fluid condition, circuits 977 (P/W) and 57 (BK) are connected through the Brake Fluid Level Switch contacts. With the park brake applied, the Park Brake Switch contacts close. If either of these two conditions is present, the Brake Indicator is grounded. Current flows through Fuse 4, The Brake Indicator and the Brake Fluid Level Switch or Park Brake Switch to ground, and the indicator illuminates.

Also, with the Ignition Switch in START, circuits 977 (P/W) and 57 (BK) are connected through the Brake Fluid Level Switch contacts, circuits 409 (T/BK) and the Ignition Switch contacts. This circuit is used as a bulb test for the Brake Indicator during engine start-up.

Check Engine Indicator

With a fault present in the Electronic Engine Control System, the EEC Module grounds the Check Engine Indicator through circuit 658 (PK/LG). Current flows through Fuse 4, the Check Engine Indicator and the EEC Module to ground, and the indicator illuminates.

Oil Pressure Indicator

With low engine oil pressure, the Oil Pressure Switch is closed, grounding the Oil Pressure Indicator. Current flows through Fuse 4, the Oil Pressure Indicator and the Oil Pressure Switch to ground, and the indicator illuminates.

AIR SUSPENSION AND DOOR AJAR INDICATORS

Voltage is present at the Check Air Suspension and Door Ajar Indicator bulbs, at all times, through Fuse 1 and circuit 296 (W/P). The bulb for each indicator is grounded under the conditions described below.

Check Air Suspension Indicator

If an Air Suspension System fault is present, the Air Suspension/EVO Steering Module grounds pin 11. Current flows through Fuse 1, the Check Air Suspension Indicator and the Module to ground, and the indicator illuminates.

Door Ajar Indicator

With any door ajar, that door's Door Ajar Switch closes and the Door Ajar Indicator is grounded. Current flows through Fuse 4, the Door Ajar Indicator and the closed Door Ajar Switch to ground, and the indicator illuminates.

Charge Indicator

With the Ignition Switch in RUN and the engine not running, or with the Ignition Switch in RUN, the engine running and Alternator output below a preset value, the Alternator grounds the Charge Indicator bulb through circuit 904 (LG/R). Current flows through the Ignition Switch, the Charge Indicator and the Alternator to ground, and the indicator illuminates.

With the Ignition Switch in RUN, the engine running and the Alternator working properly, the Alternator applies battery voltage to the Charge Indicator through circuit 904 (LG/R). With battery voltage present at both ends of the bulb filament, there is no current flow and the indicator does not illuminates.

Low Fuel Warning Indicator

When fuel level drops to a predetermined level (about 1/8 tank remaining), the Anti-slosh Module grounds the Low Fuel Indicator, causing it to illuminate.

Unlike the other Warning Indicators, the Hi Beam, Turn Indicator, Fasten Belts and Low Washer Fluid Indicator bulbs are grounded at all times. Each bulb is then powered under the conditions described below.

Hi Beam Indicator

With the headlamps turned on and the Main Light Switch Dimmer Switch in the Hi Beam position, voltage is present at the Hi Beam Indicator through circuit 932 (GY/W). Current flows through the Hi Beam Indicator to ground to illuminate the indicator.

Left and Right Indicators

With the turn signal lever in the left or right turn position, voltage is present at the Left Turn or Right Turn Indicator, and the indicator illuminates.

Fasten Belts Indicator

When the Ignition Switch is turned to RUN, the Warning Chime Module applies voltage to the Fasten Belts Indicator for 4 to 8 seconds. The indicator illuminates during that time and then turns off if seat belts are fastened.

Low Washer Fluid Indicator

When the Interval Governor applies voltage to the Windshield Washer Pump, voltage is also applied to the Washer Fluid Level Switch. With washer fluid level below a preset amount, the Washer Fluid Level Switch closes, and voltage is applied to the Low Washer Fluid Indicator, and the indicator illuminates.