Yes, the wiring should be already in place. You can remove the two plastic inserts and 2-pin connectors should be securely attached to mounting points behind the bumper. If you buy the factory fog light kit, it includes the 2 lamp assemblies, a switch (mounts in the headlight switch assembly), a fuse, and a relay. You also have to visit your dealer for a software download to activate. The installation is not a difficult DIY job, but you need a flexible shaft Torx driver to affix some of the lamp assembly mounting screws easily. The entire headlamp switch assembly pushes out from the rear, and has just one connector. I removed it to mount the fog light switch (much easier than trying to do it in the vehicle).

If you are adding fog lights for appearance, you will be happy. If you are adding them to improve visibility at the sides of the roadway, you will be dissapointed. The factory lamp mounting point is recessed to far to direct any light to the sides. You would be better off to cut the plastic inserts and mount good quality aftermarket lamp assemblies (and save money to boot). DavidM is an expert regarding the best aftermarket lights to suit your driving needs. I would buy whatever he recommends.

I have the V70 factory wiring diagrams and can send you jpg images as e-mail attachments.

Finally, as DavidM advises, you can bypass some or all of the factory wiring, and avoid the expense of the software download. I took this approach because I wanted to be able to use the fog lights independent of the head lights. I replaced the single rear fog light (which I never used in the 4 years I owned an S70) with 2 additional tail lights, one on each side (the wires and sockets were already there). I prefer hazard flashers to a single bright tail light for visibility by other drivers when driving in a thick fog; I don't want truckers to think my S80 is a motorcycle. I ran a wire from the rear fog light socket to a point behind the instrument panel, where I added a $5 relay. From there I plugged into the factory relay socket with standard 1/4" blade connectors to "tap in" to the factory connector wiring and fused power feed. I now use the rear foglight switch to turn on the front fog lights. A nice Volvo feature is a yellow indicator that appears on the instrument panel when the fog lights are on. With the factory arrangement, you don't have this. I can send drawings and instructions if you elect to go this route.

n0v8or@cox.net