'95 Chrysler Cirrus LXI Dome Light

My name is John from Archbald, Pennsylvania, I have a 1995 Cirrus LXI, 2.5L V-6. With 61,500 original miles. The dome light works when the switch is manually turned on. When it is in the middle position it doesn't work with the door open. I checked continuity on all 3 wires from the dome light fixture to where they go into the connection at the fuse panel, no breaks in the wires from there. The wires are yellow, red & black. The red is (+) constant, Black is (-) constant, and the yellow is (-) when triggered by the door switches, to complete the circuit. I checked all of the door switches and they all have continuity to ground when open. But the yellow wire at the light still has no continuity to ground. I don't have a wiring diagram to see if there is a relay or something else before the wires come out of connection at the fuse panel. Can you help?