So i'm planning on putting a light bar and some pods on my roof, and wiring them to the OE aux lighting connector, and replacing one of the dummy switches with a switch to turn them on/off. This video shows what I essentially want to do:

He says in the video that you can use a switch that isn't for the OE aux lights, but you have re-solder the connections. Problem is, is that i'm not sure what exactly to re-solder, or how. He says the config is 00011, which is D5 and D4 position. The Swedespeed discussion he references has no information on it.
I already have a few switches that I pulled off of an '04 S60.

Anyone have any experience with this?