Instrument Panel
CLUSTER ILLUMINATIONThe Cluster Illumination Lamps are supplied voltage by the Panel and Interior Lamps Control Switch through the INSTR LPS Fuse and the GRA (8) wire. Ground for the lamps is provided through the BLK (150) wire.
SPEEDOMETER
The Speedometer receives an A/C output signal from the Vehicle Speed Sensor Buffer through the LT BLU/BLK (824) wire and converts this to an analog (needle-type) display of vehicle speed.
FUEL GAGE
Voltage to the Fuel Gage is supplied through the PNK/BLK (39) wire with the Ignition Switch in START or RUN. The movement of the Fuel Gage needle is controlled by current flowing through two coils in the gage. This movement creates magnetic fields in the coils. The amount of current flowing through each coil is controlled by the Fuel Tank Sender unit. Voltage from the PNK/BLK (39) wire is applied to one end of the EMPTY (E) coil. The other end of the E-coil is connected to the FULL (F) coil and BLK (150) wire and the Fuel Tank Sender and PNK (30) wire.
When the Fuel Tank is empty the resistance of the Fuel Tank Sender is low (one ohm). This allows more current to flow through the E-coil and the Sender resistor, and the magnetic field in the E-coil pulls the pointer toward E on the Fuel Gage.
When the Fuel Tank is Full, the resistance of the Fuel Tank Sender is high (88 ohms). This allows more current to flow through the F-coil to ground through the BLK (150) wire, and the magnetic field in the F-coil pulls the pointer toward F on the Fuel Gage.
OIL PRESSURE GAGE
The Oil Pressure Gage operates the same as the Fuel Gage. The resistance controlling the current flow through the coils (High coil and Low coil) is provided by the Oil Pressure Sender through the TAN (31) wire. With no oil pressure, the resistance of the sender is low (one ohm). At 275 kPa (40 psi), the resistance is high (44 ohms).
ENGINE COOLANT TEMPERATURE GAGE
The Engine Coolant Temperature Gage also operates the same as the Fuel Gage and Oil Pressure Gage. Resistance controlling the coils (Hot coil and Cold coil) is provided by the Engine Coolant Temperature Sender through the DK GRN (35) wire. However, with a coolant temperature of 40°C (104°F), resistance of the sender is high (1365 ohms). With a coolant temperature of 125°C (257°F), resistance of the sender is low (55 ohms).
VOLTMETER
The Voltmeter indicates battery voltage with the Ignition Switch in RUN and the engine not running. With the engine running, the voltmeter indicates generator output.
INDICATOR LAMPS
Voltage to the BRAKE, SERVICE ENGINE SOON, CHECK GAGES, GEN, DAYTIME RUNNING LAMPS and ANTI LOCK Brake Indicators is provided through the IGN/GAU Fuse and the PNK/BLK (39) wire with the Ignition Switch in START or RUN. Ground for the Indicators is provided by various components in the vehicle.
Voltage to the RIGHT TURN, LEFT TURN, HIGH BEAM and SAFETY BELT Indicators is provided by various components in the vehicle. Ground is provided to these Indicators through the BLK (150) wire.
BRAKE INDICATOR
Ground to light the BRAKE Indicator is provided in one of four ways. When the Ignition Switch is turned to RUN, the Electronic Hydraulic Control Unit (EHCU) provides a ground to the indicator for about two seconds through the TAN/WHT (33) wire. This indicates the Antilock Brake System is operating properly. If a malfunction occurs in the RWAL system of the hydraulic portion of the antilock brake system, the BRAKE Indicator will light.
The BRAKE Indicator will light when the parking brake is set. This closes the Park Brake Warning Switch providing a ground to the BRAKE Indicator.
If a brake hydraulic circuit loses pressure, the Brake Pressure Warning Switch closes, providing a ground to the BRAKE Indicator.
ANTILOCK BRAKE INDICATOR
Ground to the ANTI LOCK Brake Indicator is supplied by the EHCU if a problem exists within the electronics of the Antilock Brakes System.
GENERATOR INDICATOR
Ground to the GEN (Generator) Indicator is controlled by the lamp driver circuit in the Generator. The GEN Indicator will light whenever undervoltage, overvoltage or a stopped Generator is detected by the lamp driver circuit.
MALFUNCTION INDICATOR LAMP (SERVICE ENGINE SOON)
The SERVICE ENGINE SOON Indicator will light if a problem is detected by the ECM, PCM or VCM with the engine running and the vehicle moving. Refer to POWERTRAIN MANAGEMENT for Diagnosis.
CHECK GAGES INDICATOR
The CHECK GAGES Indicator lights to alert the driver to a low oil pressure or high coolant temperature condition. The signals from the Engine Coolant Sender and the Engine Oil Pressure Sender are monitored by the Check Gages Lamp Driver which is part of the Temperature Gage. The lamp driver controls the ground to the Check Gages Lamp mounted in the instrument cluster.
SHIFT INDICATOR
On vehicles with a manual transmission, the SHIFT Indicator lights when the vehicle should be shifted to the next higher gear for better fuel economy. The ECM uses engine data such as rpm, vehicle speed and intake manifold vacuum to compute an efficient shift point. The ECM provides a ground to light the Shift Indicator through the TAN/BLK (456) wire. Refer to POWERTRAIN MANAGEMENT for Diagnosis.
TURN INDICATORS
Voltage to the Turn Indicators is provided by the Turn Switch or Hazard Switch. Voltage to the LH Indicator is supplied through the LT BLU (14) wire. The RH Indicator is supplied voltage through the DK BLU (15) wire. Refer to LIGHTING AND HORNS for Diagnosis.
HIGH BEAM INDICATOR
Voltage to the High Beam Indicator is provided by the LT GRN (11) wire with the Headlamps On and the Headlamp Dimmer Switch in HI position. Refer to LIGHTING AND HORNS for Diagnosis.
SAFETY BELT WARNING INDICATOR
The SAFETY BELT Warning Indicator is suppled a ground by the Audio Alarm Module when the ignition is first turned on. Refer to AUDIO ALARMS for further information.
DIGITAL I/P
The Digital Electronic Instrument Panel contains vacuum fluorescent displays for the Speedometer, Fuel Gage, Oil Pressure Gage, Temperature Gage and Voltmeter.
The Safety Belt Lamp, Malfunction Indicator Lamp, BRAKE Lamp, Headlamp High Beam Indicator and SHIFT Lamp (manual transmission) use standard bulbs and operate the same as the Base and Gage Cluster.
Battery voltage to the Cluster is supplied by the ORN (40) wire. This circuit voltage is used for the memory to maintain the total and trip mileages for the odometers.
Ignition voltage to the Cluster is supplied by the PNK/WHT (39) wire. This circuit supplies voltage to the vacuum fluorescent displays and the BRAKE and MALFUNCTION INDICATOR LAMP and ANTI LOCK Brake Indicators.
The other circuits to the Cluster provide the various signals necessary to operate the displays and indicators.
When the Ignition Switch is turned to RUN, all of the segments of the vacuum fluorescent displays are displayed for about two seconds. The displays then indicate current levels.
The vacuum fluorescent displays can be switched between English and Metric by the E/M switch. When the E/M switch is open, the displays are in English. When the E/M switch is closed, the displays are in Metric.
CLUSTER DIMMING
When the Ignition Switch is in RUN, the displays are at full brightness. When the Light Switch is in PARK or HEAD, the Cluster senses that the lights are on through the BRN (9) wire. This allows the display brightness to be controlled by the Panel and Interior Lamp Switch through the GRA (8) wire.
SPEEDOMETER/ODOMETER/TRIP ODOMETER
These displays receive a signal from the Vehicle Speed Sensor Buffer through the LT BLU/BLK (824) wire. The Vehicle Speed Sensor Buffer converts the speed signal from the Vehicle Speed Sensor to 4000 pulses per mile. A different Vehicle Speed Sensor Buffer is used for each axle ratio to convert the signal.
The Speedometer indicates vehicle speed in miles per hour or kilometers per hour depending on the E/M Switch position. Speeds below 1.4 mph may be displayed as "0."
The odometer/trip odometer display is mounted on a separate board attached to the main display board. The odometer displays the total vehicle mileage up to 999,999 miles in the English mode. If the mileage exceeds this, the display flashes ERROR. In Metric mode, the display will flash ERROR when it exceeds 999,999 kilometers. The English display will show the normal display.
The display can be switched from total odometer to trip odometer by pushing the trip switch. When the TRIP Switch is open, the total mileage is displayed. When the TRIP Switch is closed, the trip mileage is displayed.
The Trip Odometer can be reset to 0 by pushing the RESET Switch. The display must be in the TRIP mode to be reset.
The accumulated mileage of the two displays is stored in a nonvolatile memory chip to prevent losing this data if the battery or cluster is disconnected.
If the Cluster is replaced, the Odometer Display can be transferred to the new cluster.
FUEL GAGE DISPLAY
The Fuel Gage Display shows the fuel level in the tank. This signal is supplied to the Cluster through the PNK (30) wire. With low fuel level in the tank, the sender resistance is low. With high fuel level in the tank, the sender resistance is high.
If the fuel level in the fuel tank drops below approximately 11 liters (3 gallons) in a 75-liter (20-gallon) tank, a box around the Fuel Gage ISO Symbol flashes to indicate low fuel level.
OIL PRESSURE GAGE DISPLAY
The Oil Pressure Gage Display shows the engine operating oil pressure. This signal is supplied to the Cluster through the TAN (31) wire. With low oil pressure, the sender resistance is low. With high oil pressure, the sender resistance is high.
If engine oil pressure drops below 69 kPa (10 psi), a box around the Oil Pressure Gage ISO Symbol flashes to indicate low oil pressure.
ENGINE COOLANT TEMPERATURE GAGE DISPLAY
The Engine Coolant Temperature Gage Display shows the engine coolant temperature. This signal is sent to the Cluster through the DK GRN (35) wire. With low coolant temperature, the sender resistance is high. With high coolant temperature the sender resistance is low.
It the coolant temperature exceeds 11 8°C (245°F), a box around the Engine Coolant Temperature Gage ISO Symbol flashes to indicate an engine overheat condition.
VOLTMETER DISPLAY
The Voltmeter Display shows the battery voltage. The Voltmeter is connected to the PNK/BLK (39) wire and the BLK (150) wire.
If the generator output is high, low or 0 volts, a box around the Voltmeter ISO Symbol flashes to indicate a problem with the charging system. This signal is sent to the cluster through the BRN (25) wire.
TACHOMETER DISPLAY
The Tachometer Display shows engine revolutions per minute (RPM). The Tachometer is connected to the WHT (121) wire.
The Tachometer has a total range of 0-5500 RPM. The YELLOW warning region has a range of 4500-5000 RPM and the RED warning region has a range of 5000-5500 RPM.