How do you turn off maintenance required light for 2008 highlander?

With the car key on ACC, put your odometer on the mileage setting (not 'trip') then turn the key off - then, while holding down the button that switches from odo and trip, turn the key back on to ACC - you will notice the maintenance light blink and then go out. The vehicle computer automatically resets the mileage interval until it goes on again.