Instrument Cluster

Fig.1 Base Instrument Cluster Without Tachometer:

Fig.2 Premium Instrument Cluster With Tachometer:

INSTRUMENT CLUSTER
For the domestic market, there are two conventional instrument cluster assemblies available, Base and Premium. The Premium Instrument Cluster is equipped with a Tachometer and a Low Fuel indicator. The clusters electronically drive the speedometer, odometer, gauges, and tachometer (if equipped). Refer to (Fig. 1) and (Fig. 2).

The Instrument Cluster Speedometer, Tachometer, and Engine Coolant Temperature gauges are positioned using PCI Bus messages received from the PCM. The Fuel gauge is a hard wired input from the Fuel Level Sensor in the Fuel Pump Module.

The Cluster also contains warning indicators that are illuminated by hard wired inputs or by messages received from other modules on the PCI Bus.

The Trip/Total Odometer is a Vacuum Fluorescent (VF) display that is controlled by PCI Bus messages received from the PCM. The VF display also displays the "Door", "Cruise", and "Trac" messages. If the Instrument Cluster experiences a loss of PCI Bus communication with other modules on the Bus, the Cluster will display "nobus" in the VF display.

The illumination lamps are hard wired in the Instrument Cluster. When the Park or Headlamps are turned ON, the Cluster receives a hard wire input from the Multi-Function Switch. The Cluster sends a Panel Lamps Dimmer Signal to ground through the Multi-Function Switch. The varying voltage drop is sensed by the Instrument Panel Drivers to create a corresponding amount of illumination dimming. This dimming level is then sent out from the Cluster to other components.

The Cluster will communicate with the DRB III to display PCI Engine Info, PCI Bus info, and certain inputs/outputs. The Cluster is also capable of performing a diagnostic Self-Test that is actuated by depressing and holding the Odometer trip reset stalk while cycling the ignition from the OFF to the ON position. The Cluster will position all of the gauges at specified calibration points and will illuminate all the PCI Bus controlled indicators. The Cluster will also illuminate each segment of the VF display.

If the Cluster does not detect voltage on the Courtesy Lamp circuit, the message "FUSE" will alternate with the odometer/trip odometer for 30 (thirty) seconds after the ignition is turned ON and for 15 (fifteen) seconds after the vehicle is first moved.

Warning And Indicator Lamps
The instrument cluster has warning lamps and indicators for the following systems:
- Airbag
- Anti-lock Brakes (ABS) if equipped
- Brake warning
- Charging System
- Front fog lamps (if equipped)
- High beam indicator
- Low fuel (premium cluster only)
- Low oil pressure
- Malfunction indicator (service engine soon) lamp
- Right and left turn signals.
- Seat belt warning
- Security system
- Trac-Off (ABS equipped vehicles only)

The instrument cluster has a Vacuum Fluorescent (VF) display for the following systems:
- Cruise
- Door (ajar)
- Odometer
- Set (cruise)
- Trac
- Trip

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 also 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 cluster.

The instrument cluster controls the courtesy lamps, it receives and sends messages to other modules via the PCI bus circuit, it controls all the instrument illumination and the chime is also an integral part of the cluster. The front turn signals are wired through the cluster and then go to the front lamps. The reason being that the DRL module is built into the cluster (if equipped).

All gauges in the electronic clusters are the analog type gauges. When the ignition switch is moved to the OFF position, the cluster 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.

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 heck when the ignition is turned from OFF to ON. All of the LED's are replaceable.

In the event that the instrument cluster looses communication with all other modules on the PCI bus, the cluster will display "nobus" in the VF display. The VF display also displays "Door", "Cruise", "Trac", and odometer trip or total.

If the cluster does not detect voltage on the courtesy lamp circuit, the message "FUSE" will alternate with the odometer/trip odometer for 30 seconds after the ignition is turned ON and for 15 seconds after the vehicle is first moved. The lack of voltage can be due to the M1 Fused B+. IOD. fuse being open, a bad or missing courtesy lamp bulb, or a circuit problem.