Im a bit late but do you have a picture of the switch you bought? There are 3 different 5pin switch with different switch layouts that will work for our civic, one of them being oem. Im glad everyone is trying to help but it shouldnt be this complicating.
Break it down into 3 steps.
Wire Pin 1/2 between/in the circuit you want to turn on and off
Wire Pin 3 to Pin 2 wire if you want the switch to be brighter when turning it on. Your switch may or may not come with an additonal bulb for pin 3 and does not need to be wired aka optional.
Wire Pin 4/5 to any other switches with illumination ie Econ, VSA, emer button. They will have two wires for illu. Doesnt matter which pin goes to which wire as long as its wired in a parallel manner, Pin 4 to A, Pin 5 to B or Pin 4 to B, Pin 5 to A
Here is my layout for the switch with notes for you that I made and used a while back for my illumination kit I did. I think this is the first time I uploaded this and will put it on my Build Thread Front page after this post.
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