Home so I can see the pdf now. Yes, pic#26 is what I'm refering to. Not sure what you mean by 'it leaves here and goes to the two plugs under the drivers kick panel'. Also, nothing says it has anything to do with pin5.
The instructions show the harness your adding (which you'll need to make) It shows where it goes to the ground (side where a ground point already exists) and a wire to put through the firewall into the drivers foot well, which is the LB wire. The LB wire is then put it in the pin3 location. (the wire that was there is taken out and taped off). This appears to be the power wire to the fogs to complete the circuit, as you have the ground already in the engine bay.
From what the instructions show, much of the wiring is already there. They're connected by way of putting in the light controller stalk, photosensor, and relay. They then can send power, when switched on, to the fog lights, from what they show. The switched power goes through via that pin3, through the firewall to the fogs from the look of it.
The beatings will continue until attitudes improve!
HID Quad bi-xenon + foglight retrofit