These lights turn on the "engine start stop"switch is turned to ignition on mode(vehicles with smart key system) or the engine switch is turned to the "on"position (vehicles without smart key system ) to indicate that a system check is being performed. they will turn off after the engine is started,or after a few seconds. They may be a malfunction in a system if a light does not come on, or if the light do not off. have the vehicle inspected by your Toyota dealer for details.