Each instrument cluster (IPC) is equipped with a season and trip odometer. The IPC uses the vehicle speed signal from the PCM that is also used in order to show vehicle speed on the speedometer. The vehicle mileage is determined by counting the speed pulses from the vehicle speed signal (VSS) and calculating the mileage for odometer displays. The odometers can be displayed in miles or kilometers. The units displayed is switched between english and metric by pressing the ENG/MET button.

The season odometer displays the total accumulated miles or kilometers of the vehicle. This value is permanently stored in the EEPROM of the IPC. If an odometer malfunction occurs or if the IPC must be replaced, an authorized Delco service center must be contacted to program proper vehicle specifics (including mileage) for the IPC.

The season odometer is capable of displaying 999,999 kilometers or 999,999 miles depending on units selected. Leading zeros are not displayed. The display will not roll-over to 000,000 if the maximum displayed miles or kilometers are reached. If the display limit is exceeded, the maximum value (999,999) is displayed. If the mileage is above 621,503 miles and metric units are selected the odometer shall display 999,999 km.

The trip odometer displays the accumulated miles or kilometers to the tenths of a mile or kilometer since the last reset. This value is stored in KAM of the IPC. The IPC has 2 trip odometers which can be selected by pressing the TRIP A/B button. The displayed trip odometer is reset on the IPC by pressing the TRIP RESET button. Both trip odometers accumulate miles or kilometers even when they are not displayed.

If a button is not used to reset the trip odometer, the display will roll-over automatically as follows. For vehicles sold in Europe, Canada, Japan, and the Gulf States, the trip odometer will roll-over at 1999.9 kilometers (1242.6 miles). For all other vehicles, the trip odometer will roll-over at 999.9 miles (1609.1 km).