-pull passenger side kickpanel
-unbolt ecu out of place
-find turnable screw on one side
-turn it fully counterclockwise (light will go off)
-turn it back clockwise

long blinks = tens digit
short blinks = ones digit

count them, there might be more than one.

mine triggered right before 60k thought it was routine maintenance.

they dont light up unless there's a code. mine turned out to be 2 that dont even appear on the list below (83 and 122 - which were MAP sensor and something else - basically emissions/stoich crap that wont matter - ive had my light on for almost 2 years now lol)

you can reset it by following the instructions on the link below which tells you everything. also, if its truly a code, the light will come back on in a few seconds if it isnt fixed. leaving the negative battery cable disconnected for 5 - 10 minutes also resets some of it, i do this after every modification or major maintenance to make sure.

http://www.cautioncreativity.com/briand/ECU%20codes.htm