Engine Bay Fuse box
#24
#26
You should at least get a "pass" code. If nothing at all shows it could be a sign of a failing computer. At least that's what it seems based on threads Ive seen here. My switch connections were going bad for some reason but I was in the middle of doing stuff to my truck so I just permanently attached the wires for the rear pump and the wires for the gauge to read the rear tank.