This morning when I got into the jeep and fired it up I noticed that the 4WD light was on. The only thing was I was in 2WD at the time. I shifted to neutral and shifted from 2WD to 4WD HI then N then 4WD L and back again. It stayed on while backing up then when I shifted into drive it was out. I noticed in the Haynes manual these a 4WD switch in the diagrams in the back, where is this switch located and can it be cleaned?