sensor malfuntion light on??

i just changed the skid plate on my RSX, in order to do so i had stood it up resting on the rear bumper. (used the winch) after i lowered it and started it i now have an open book with a wrench light on (according to the manual its due to a sensor malfunction.)

any ideas on why this light would come on? its running fine. is there a way to reset it?