GM Service Manual Online
For 1990-2009 cars only

The trip computer has three buttons that control its functions.

ENG/MET (English/Metric): Press this button to change the display from English to metric units or metric to English.

RESET: Press this button for two seconds to reset the mode displayed.

MODE: Press this button to change the function mode, (Fuel Used, AVG ECON, OIL LIFE, RANGE) being displayed.