Here is some more information on found on the GM Service website regarding the odometer:
*The base instrument panel cluster (IPC) contains a season odometer and a trip odometer. Momentarily press the trip/reset switch on the IPC in order to toggle between the season odometer and the trip odometer. Press the trip/reset switch for greater than 2 seconds, while the trip odometer is displayed, in order to reset the trip odometer.
The body control module (BCM) calculates the mileage based on the vehicle speed signal circuit from the powertrain control module (PCM). The BCM then sends a class 2 message to the IPC indicating the value of the odometer. The odometer will display 'error' if an internal BCM memory failure is detected. The odometer displays either miles or kilometers and the desired units can be accessed by pressing the trip/reset switch.*
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