Instrument Panel, Gauges and Warning Indicators: Description and Operation

There are four conventional instrument duster assemblies available. The dusters electronically drive the speedometer, odometer, gauges, and tachometer (if equipped).
- Base
- Premium - Base cluster with tachometer and Low Fuel indicator.
- Luxury - Same features as Premium with black overlay and chrome rings.
- Autostick - Luxury duster with Autostick. The overlays for premium, luxury, and autostick clusters have the same indicator layout.

The duster speedometer, tachometer, and engine coolant temperature gauges are positioned using Programmable Communication Interface (PCI) bus messages received from the Powertrain Control Module (PCM). The fuel level information is calculated by the cluster based on a hard wire input from the fuel level sensor in the fuel pump module.

INDICATORS
The instrument cluster has indicators for the following systems:
- Front Fog Lamp
- Rear Fog Lamp (if so equipped)
- Brake
- ABS (if so equipped)
- Cruise (if so equipped)
- Door
- Left Turn Signal
- Right Turn Signal
- High Beam
- Malfunction Indicator Lamp (MIL)
- Low Oil Pressure
- Low Fuel Indicator
- Seat Belt
- Battery
- Airbag
- Security (if so equipped)

The mileage and message display is composed of six, 7-segment displays and a decimal point. The display may show the odometer mileage, the trip odometer mileage, P-codes, "no bus" for loss of bus communication, and "FUSE" for loss of battery fuse.

- PRND/Autostick (if so equipped) - The PRND/ Autostick display is controlled by the transmission control module (TCM). The cluster will illuminate the appropriate PRND/gear based upon the message received by the TCM.

The instrument cluster warning/indicator lamps are all serviceable Light Emitting Diodes (LED's). The instrument cluster must first be removed, and then the defective LED just turns out with needle nose pliers.

ILLUMINATION LAMPS
The high beam indicator, turn signals, and illumination bulbs are serviceable. The instrument cluster must first be removed, and then the defective bulb and socket turns out. The bulb locations are printed on the back cover of the instrument duster.

The instrument cluster controls the courtesy lamps, it receives and sends messages to other modules via the Programmable Communication Interface (PCI) data bus circuit, it controls all the instrument illumination and the chime is also an integral part of the duster. The front turn signals are wired through the duster and then go to the front lamps.

All gauges in the electronic dusters are the analog type gauges. When the ignition switch is moved to the OFF position, the duster drives each gauge to its lowest position. The individual gauges are not serviceable and require complete replacement of the cluster if one or more gauges are inoperable.

NOTE: If any of the gauge pointers are stuck on the wrong side of the pointer stop, perform one of the following:

- Pull the M1 fuse in the fuseblock (refer to Wiring Diagrams for fuse locations) and key on. The gauge pointer will "sweep" the gauges and return all pointers to the correct side of the stop. Key OFF, reinsert the M1 fuse. The cluster will "sweep" the gauges one additional time. The cluster will "sweep" the gauges anytime there was a change in the state of the M1 fuse.

- Perform the instrument self-diagnostic check . This will "sweep" all the pointers to the correct side of the pointer stop.

One button is used to switch the display from trip to total mileage. Holding the button when the display is in the trip mode will reset the trip mileage. This button is also used to put the cluster in self-diagnostic mode. Refer to Electrical, Instrument Cluster, Standard Procedures- Cluster Self-Diagnostics. Most of the indicators will come on briefly for a bulb check when the ignition is turned from OFF to ON. All of the LED's are replaceable.

The cluster calculates the appropriate odometer mileage based on PCI bus information received from the PCM. The VF display also displays the "Door" and "Cruise" messages. If the instrument cluster experiences a loss of communication with the PCI bus, the cluster will display "no bus" in the display. If the cluster determines that there is not 8.0 volts at the battery input, then the cluster shall alternately display "FUSE" and the odometer mileage.

- Front Fog Lamp (if so equipped) - Hard wire input - Cluster will illuminate the indicator when the front fog lamp input is at Vehicle System Voltage (VSV).
- Rear Fog Lamp (if so equipped) - Hard wire input - Cluster will illuminate the indicator when the rear fog lamp input is at VSV
- Brake - Hard wire OR PCI bus driven - Cluster will illuminate the indicator if the park brake switch is grounded OR after receiving the appropriate message from the ABS/PCM modules.
- ABS (if so equipped) - PCI bus driven - Cluster will illuminate the indicator after receiving the appropriate message from the ABS module.
- Cruise (if so equipped) - PCI bus driven - Cluster will illuminate the indicator after receiving the appropriate message from the PCM.
- Door - Hard wire input - Cluster will illuminate the indicator if either door input is grounded for more than 250 milliseconds.
- Left Turn Signal - Hard wire input - Cluster will illuminate the indicator if the left turn signal input is at VSV
- Right Turn Signal - Hard wire input - Cluster will illuminate the indicator if the right turn signal input is at VSV
- High Beam - Hard wire input - Cluster will illuminate the indicator whenever the high beam switch input is at VSV
- Malfunction Indicator Lamp (MIL) - PCI bus driven - Cluster will illuminate the indicator after receiving the appropriate message from the PCM.
- Low Oil Pressure - PCI bus driven - Cluster will illuminate the indicator after receiving the appropriate message from the PCM.
- Low Fuel Indicator - Cluster will illuminate based upon fuel level calculated by the cluster (using data received from the hard wire input from the fuel level sensor).
- Seat Belt - Hard wire - Cluster will illuminate whenever the seat belt input is grounded with the ignition in RUN mode.
- Battery - PCI bus driven - Cluster will illuminate after receiving the appropriate message from the PCM.
- Airbag - PCI bus driven - Cluster will illuminate after receiving the appropriate message from the airbag control module.
- Security (if so equipped) - PCI bus driven -Cluster will illuminate whenever the remote keyless entry (RKE) input is grounded and the cluster has a battery feed. Cluster will flash the indicator based upon the message received from the sentry key immobilizer module (SKIM).

The 7-position dimmer switch input is used by the cluster to determine lighting intensity, the cluster transmits dimming information to other modules via the PCI bus.