Originally Posted by DBO
Fog light relays are in a box enclosure in the engine bay. An absolute nightmare if you're thinking of hooking into that. The wiring harnesses are wrapped up tight and access to the relay box is nigh impossible.
Just a word of warning on the factory switches. I bought a spare one so it would match my other two when I installed my air horns, but they are not like a standard switch. Firstly they are ridiculously expensive (I think it was something like $75/each). If you get the ON/OFF fog light switch and you're thinking of using it as a relay trigger just be aware that the internal light is incandescent (not LED) and draws too much power to then use the outgoing side on a standard 12V relay. You need to modify the switch internally (i.e. take it apart and potentially damage it). Lots of mucking around, not to mention the cost. Consider using the button blanks to mount a switch and using your own wiring and relays.
I bought a set of factory foglights, they came with the switch and the car was already pre-wired for them. Installation was very easy and no problems so far.
There are three blanks on the dash - one for fog lights (already pre-wired), one for alarm system, and one for headlight washers.