I undertook my project of adding a map light assembly into the headliner of my 98 civic LS today. I had to remove all the upper interior trim to pull down the head liner, but it wasn't too bad. I mounted the map light assembly and have put everything back together. I haven't figured out the wiring, maybe someone here can help. My Civic LS 4D is a '98, the dome light has two wires only. One leads to the battery + , the other comes from the door switches. (I have the '98 wiring diagram) The grounding comes from being screwed to the metal frame of the roof. The map light is from a 2001 Civic EX 2dr. There are 4 wires (see picture) From looking at it, I'm thinking black is ground, red is (+), but there is still blue and green. Green is possibly for the door switch lead, but what about blue which is tied into yellow (thus tied to white)? I have to make four wires become three. I'm either going to have to tie two or leave one out. Anyone have any clearer idea of this than I do?