Have a 2004 Chevy Trailblazer LTZ w/5.3L. When you open the left, rear passenger door, the Gate Ajar light comes on. I assume this is for the rear lift gate because when this light is on, it disables the rear wiper. Bought the truck used a few months ago. Appears that the someone did some work and made improper connections when putting back together. Does anyone have a schematic on this circuit? Where would I start to look at for wrong connections?