The First Responder cut loop is located under the hood on the Left Hand side near the suspension strut tower and may be concealed by the cowl cover. To remove the cover, grasp the rear edge and pull up. See Hood Opening and Closing for more information.
You can determine the location of the cut loop by the yellow label wrapped around it. This label should be visible, even with the maintenance access panel in place.
The primary method to isolate the high voltage system is to unplug the First Responder Loop connector and remove the loop. The emergency alternate method to isolate the high voltage system is to complete 2 cuts (one on each side of the First Responder Loop Label), and remove that section completely.