theres a step by step in your owners manual in the maintenance section, i dont remember exactly how it goes offhand, but its a little button/key turn dance. If you cant find it i'll check it out later and post it
Don't need to start the car... just set it to trip-A, turn the key off, hold the mode button, turn the key back on (still holding the mode button). You'll see a line of dashes that will disappear one at a time. When they are gone, let go... done!
SOLD: 2009 Scion xD - BRM, 16" alloys, VSC, K&N drop-in air filter, Thule Aero roof bars, TRD sway bar, TRD short shift, TYC LED tails, Curt class-1 tow hitch, Italian leather shift & brake boots, Red Line MT-90 in the trans, Amsoil 0w20 in the engine, ATE SuperBlue Racing brake fluid.