1) With the power on, switch to the odometer/trip-meter to display "ODO".
2) Power OFF (push the "Power" button).
3) Press & hold the "ODO" button.
4) With your foot on the brake, power ON (keep holding the "ODO" button).
5) Wait for the reminder light to stop flashing, then release the "ODO" button.

While the reset is taking place, you'll see the odometer value change to 5 dashes. Then each will be disappear, one at a time from the left. When finished, 7 zeroes will briefly appear, indicating the process is complete before the previous odometer mileage returns.

(that's what my car tells me, so it must be true)

In the owner's manual this info is in the "Information on instruments and controls" section
[Section 2-5 in my 04 manual]

Bill G in Colorado

[b]That info is in your owners manual.