GM Service Manual Online
For 1990-2009 cars only

In addition to the standard odometer, the cluster can also display a trip odometer. The display can be toggled between the odometer and the trip odometer by quickly pressing and releasing the trip/reset button located to the right of the temperature gage. The trip odometer will continue to keep track of miles or kilometers driven even if they are not currently displayed. A Canadian trip odometer will remain in metric units only. To reset the trip odometer to zero (0), push and hold the trip/reset button for at least one and a half seconds, but less than three seconds. The trip odometer that is showing in the display will be reset.

Retro-Active Reset

The trip odometer has a feature called retro-active reset. This feature can be used to set the trip odometer to the number of miles or kilometers driven since the ignition was last turned on. This can be used if you forget to reset your trip odometer at the beginning of a trip. To use the retro-active reset feature, push and hold the trip/reset button for at least five seconds. The trip odometer will then display the number of miles or kilometers driven since the ignition was last turned on and you began driving. If you use the retro-active reset feature after you have started the vehicle, but before you begin moving, the display will show the number of miles or kilometers you drove during the last ignition cycle. Once you begin driving, the trip odometer will accumulate mileage. For example, if you have driven 5.0 miles (8.0 km) since you started your vehicle, and then activate the retro-active reset feature, the display will show 5.0 miles (8.0 km). As you drive, the display will then increase to 5.1 miles (8.2 km), 5.2 miles (8.4 km), etc.