I recently bought a 1994 Nissan Pathfindetr LE 4x4 however I didn't get an owners manual with it..I have all the features pretty much figured out with one exception..Could somebody tell me what the the rocker switch located on the left side of the steering wheel that says Auto in top position with E-AT on switch and Power on bottom position with a light on bottom of switch..(did that even make sense?

?) Is this something for 4 wheel drive or what..Any help would be appreciated..Thanks