2003 Chevrolet Astro Owner's Manual - Page 150

Speedometer and Odometer Your speedometer lets you see your speed in both miles per hour (mph) and kilometers per hour (km/h). Your odometer shows how far your vehicle has been driven, in either miles (used in the United States) or kilometers (used in Canada). Your odometer is tamper resistant. The digital odometer will read 999,999 if someone tries to turn it back. You may wonder what happens if your vehicle needs a new odometer installed. If the new one can be set to the mileage total of the old odometer, then it must be. But if it can't, then it's set at zero, and a label must be put on the driver's door to show the old mileage reading when the new odometer was installed. Trip Odometer The trip odometer can tell you how far your vehicle has been driven since you last set the trip odometer to zero. The trip odometer will appear in place of your regular odometer when you press the TRIP button. To reset the trip odometer, press and hold the TRIP button. To change back to the regular odometer, press the TRIP button again. 3-25