GM Service Manual Online
For 1990-2009 cars only

The trip odometer can show how far the vehicle has been driven since the trip odometer was last set to zero.

Press the reset button, located on the instrument panel cluster next to the trip odometer display, to toggle between the trip odometer and the regular odometer. Holding the reset button for approximately one second while the trip odometer is displayed resets it.

To display the odometer reading with the ignition off, press the reset button.