Instrument Panel, Gauges and Warning Indicators: Description and Operation

INTRODUCTION
The instrumentation gauges on NS vehicles are contained in a subdial assemblies within the instrument cluster. The individual gauges are not serviced separately If one of the cluster gauges becomes faulty the entire subdial would require replacement and all gauges will have to be calibrated.

The mechanical instrument cluster with a tachometer is equipped with a electronic vacuum fluorescent transmission range indicator (PRND3L), odometer, and trip odometer display

The mechanical instrument cluster without a tachometer is equipped with a cable operated transmission range indicator (PRND21).

The instrument cluster is equipped with the following warning lamps.
- Lift Gate Ajar
- Low Fuel Level
- Low Windshield Washer Fluid Level
- Cruise
- Battery Voltage
- Fasten Seat Belt
- Door Ajar

CIRCUIT OPERATION
The Instrument Cluster, located on the left side of the instrument panel, provides the operator with gauges and warning lamps indicating vehicle operation. All gauges, regardless of engine type, are driven by the CCD Bus from the Body Control Module (BCM).

The indicator lamps for the Seat Belt, Charging System, Cruise (Vehicle Speed Control), Low Fuel, Low Washer Fluid, Door Ajar, and Liftgate Ajar are also driven by the BCM.

Battery Voltage for the instrument cluster is provided from two different sources. One is the F11 circuit, which supplies battery Voltage for the cluster. This circuit is protected by 10 amp fuse and located in cavity 2 of the junction block. This fuse is HOT when the ignition switch is in the UNLOCK/RUN/ START position.

Power for the fuse is supplied on circuit A81 from the ignition switch. Circuit M1 supplies power for the A81 circuit at the ignition switch.

The M1 circuit is the Ignition-Off Draw circuit, and is protected by a 10 amp fuse located in cavity 10 of the Power Distribution Center (PDC). This circuit is also a constant battery feed for the instrument cluster.

Illumination lamps, internal to the cluster, receive battery Voltage on the E2 circuit. This circuit originates in the BCM and lamp intensity is controlled by the BCM. Ground for the lamps is provided on the Z1 circuit.