Red/Black (pin 5) goes to another red/black in the dash. The 4WD switch and the rear window switch both have red/black illumination wires.
Orange/White (pin 6) connects to a power wire for the fog lights. The purpose of this is that when the fog lights turn on, the wire draws power, and the little LED light in the fog light switch will turn on to reflect such.
Essentially, use the OEM switch to break the relay ground wire. What I did is connect the relay power wire to an always-on source (specifically, my parking [NOT BLINKER] light power wire so I can turn the PIAAs on when the parking lights are on, and so when I shut down the vehicle, the autolamp feature automatically stops any chance of me forgetting to turn the PIAAs off).
Then, instead of grounding the relay ground anywhere, which would create an always on issue, I ran it through the firewall and to the switch pin 3. As a shortcut, you do NOT need to run switch pin 4 back through the firewall; rather, run a wire from pin 4 to any other ground source behind the dash.
Thus, coming through the firewall should only be two wires--that to pin 6 to illuminate the LED when the lights are on (which taps a power wire going to one of the fog lights), and that to pin 3 to complete the ground circuit (which comes from the relay [well, originally it would come from the relay and possibly to a switch provided by your light manufacturer, but I cut off that switch because I used the OEM switch--and so are you] and ordinarily would be grounded somewhere).
As I said, then, now when you push on the switch, it will complete the ground connection, and will complete the relay circuit. So, the lights will turn on. When you push the switch again, the ground connection will break, and the lights will turn off.