just so we are on the same wavelength (sorry, a light joke there, get it lite....light.....oh nevermind).
You speak of the little light that reminds you to change your oil and rotate your tires and stuff like that, right?
You do not speak of the Check Engine Light, aka CEL (yellow and looks like and engine), right?
try this if it is the reminder light to change your oil and stuff.
1. With your car OFF, place your key in the ignition and turn to "On". Do not start the car.
2. Find the odometer button and press until it reads the total odometer setting, (not the Trip A or Trip B setting).
3. Turn the key to OFF.
4. Place your finger back on the odometer button, press and hold. At the same time, turn the key back to "On".
5. Hold the odometer button in until the MAINT REQD light goes out...should take about 8-10 seconds.
Good Luck
steviej