Oil Life Reset
WARNING: This page is about a different car, the 2005 Saturn L300. However, it is still accessible from the selected car via links, so may be relevant.
The change oil soon light is reset by depressing the oil life reset push button switch. This switch is located in the underhood fuse block. Pressing this switch grounds circuit 1579. When grounded, the body control module (BCM) requests the engine controller to perform an oil life reset. When reset is completed, the BCM will turn OFF the change engine oil light.