Both instrument clusters provide analog gauges for the following conditions:

The instrument cluster obtains vehicle speed information over a discrete input from the Powertrain Control Module (PCM). The vehicle speed pulse train is 4000 pulses per mile.

The instrument cluster provides the following displays in both the base and uplevel clusters:

The base level cluster uses a dedicated display for odometer information. The uplevel cluster displays odometer information on the DIC. The uplevel cluster has 2 trip odometers. Season and trip odometer information display on the DIC when you press the ODO/TRIP button. The instrument cluster performs all calculations for these displays internally based on the vehicle speed input received from the PCM.

Important: When you replace a speedometer/odometer assembly, the federal law requires that you set the odometer reading of the replacement unit to the same mileage as the prior odometer. If you cannot set the same mileage, the law requires that you set the replacement odometer to zero and install a label on the driver's door frame in order to show the previous odometer reading and the date of replacement.

The season odometer displays the total accumulated miles or kilometers of the vehicle. The value is permanently stored in the EEPROM of the instrument cluster. If an odometer malfunction occurs or if you must replace the instrument cluster, contact an authorized Delco® service center in order to program the proper vehicle specifics (including mileage) for the instrument cluster.

The trip odometer displays the accumulated vehicle miles or kilometers since the last reset. The value is stored in the KAM of the instrument cluster.

In order to reset the trip odometer on the base instrument cluster, press the TRIP RESET button.

In order to reset the trip odometer on the uplevel instrument cluster (UB7), perform the following steps:

1. Press the ODO/TRIP button.
2. Press the RESET button when the trip odometer messages are displayed on the DIC.
3. If a button is not used in order to reset the trip odometer, the display rolls over in the following manner:

•	The trip odometer rolls over at 999.9 miles when operated in English mode.

•	The trip odometer rolls over at 999.9 kilometers when operated in metric mode.

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When the trip odometer is displaying greater than 621.4 miles (operating in English mode) and you press the ENG/MET button, the trip odometer resets to zero. The trip odometer resets to zero because the conversion from miles to kilometers is greater than 999.9 kilometers. If you press the ENG/MET button again, the instrument cluster converts the displayed kilometers to miles.

The PCM sends engine coolant temperature data to the instrument cluster through the class 2 serial data line. The instrument cluster uses a look up table in order to determine needle deflection. The instrument cluster uses a smoothing filter in order to secure a continuous response.

The instrument cluster monitors a discrete input from the fuel level sender in order to determine the fuel level. The raw fuel level data is filtered for gauge display purposes. The instrument cluster has the following 2 filter modes:

A slow (heavy) filter is used whenever the vehicle is not in PARK. The slow filter prevents fuel slosh from affecting the gauge.

A fast (light) filter is used whenever the vehicle is in PARK. The fast filter allows the gauge to respond quickly when the vehicle is being fueled.

The instrument cluster also sends raw fuel level data to the PCM through a class 2 serial data line.

The PCM drives the engine RPM (tachometer) gauge through a discrete input.

The PCM monitors the PNP switch in order to determine PRNDL information. The PCM sends the information to the instrument cluster through the class 2 serial data line. The instrument cluster then displays the gear position.

The instrument cluster displays are dimmable. The indicators are non-dimmable. The lighting control module (LCM) directly controls the instrument cluster incandescent backlighting (graphics and pointers), through a dimmer signal input. The instrument cluster monitors the input and the dim enable signal input in order to determine the following functions:

The uplevel instrument cluster contains a 32 character (2 lines x 16 characters) dot matrix configurable message center called a driver information center (DIC). The DIC displays various messages to the driver. The DIC switches control the DIC.