This description is based upon the following excellent How-To for an OEM hitch by CLB_IV:
There are some minor differences in the 2015 model and the mounting for the Draw-Tite is completely different from the Volvo OEM hitch. I have downloaded instructions for the Curt XC60 hitch and it appears to be identical. Neither aftermarket hitch requires any cutting of the bumper cover, but the heatshield must be cut.
CLB_IV made it clear that jacking up the XC60 is not necessary and that removing the rear bumper is easy, so i decided to do that rather than using the fishwire method. However, i recommend that you employ an assistant to avoid damaging the cover by dropping one end. My son and I did the hitch install in about 2 hours, taking time for pictures.
Before. Two of the T25 screws are inside the round black rubber bumpers, one on each side. There are 5 more T25 screws along the rear edge of each wheelwell, the bottom 3 also mount the OEM mudfaps I installed. There is only ~3" of clearance to the tire, so a 1/4" drive ratchet with a T25 bit works best.
[IMG]xc60hitch02a by tonyjag03, on Flickr[/IMG]
Here you can see the 4 bottom edge bumper cover bolts with 8mm heads that don't seem to be in earlier models.
[IMG]xc60hitch02.1 by tonyjag03, on Flickr[/IMG]
Once all 14 bolts are out, pull out (perpendicular to the car) at the top edge of the cover on each side and many tabs will release like a zipper. The right person will need to unplug the connector for the foglights and rear parking assist sensors, then the cover moved to a soft place where it won't get scratched. There are 6 10mm bolts that hold the steel bumper in place. I think they have 14mm heads. With no torque specs, I measured about 40 ft-lbs to undo them.
[IMG]xc60hitch03 by tonyjag03, on Flickr[/IMG]
In this view from behind the cover, you can see the connector hanging. When you re-connect it, there is a black plastic clip mounted to the bumper (top center of picture) that holds the cable.
[IMG]xc60hitch04 by tonyjag03, on Flickr[/IMG]
The DrawTite XC60 hitch ready to install. I touched up shipping dings with black Rustoleum epoxy paint and covered the labels with clear 3M film.
[IMG]xc60hitch05 by tonyjag03, on Flickr[/IMG]
Here are the DrawTite instructions, but I did a few things differently. It is not necessary to 1. raise the vehicle nor 2. undo the exhaust mount. Rather than cutting out a corner of the heatshield, I just cut along the crease next to the mount with small tin snips, then folded it down to be parallel to the insides of the hitch's end plates.
[IMG]xc60hitch06 by tonyjag03, on Flickr[/IMG]
With the bumper and cover off, the fishwires need not be used; you can reach into the holes where the OEM hitch would mount. Here you can see all 3 mounting bolts and blocks for the left side. We used a spray can of fluid film rust inhibitor.
[IMG]xc60hitch07 by tonyjag03, on Flickr[/IMG]
To avoid rattles, i used 2 clips to hold the bent-down heatshield to each of the hitch's end plates. Autozone sells a pack of 3 6mm plus 3 8mm wide-panel speed nuts. I bought 2 packs so all 4 could be the same 6mm size, but the 8mm ones would also work. Using bolts as well didn't seem necessary.
[IMG]xc60hitch08 by tonyjag03, on Flickr[/IMG]
xc60hitch09 by tonyjag03, on Flickr
View of left side, showing clips and heatshield cut
[IMG]xc60hitch10 by tonyjag03, on Flickr[/IMG]
Left side, looking up. You can see one clip and also the nut and washer of the lateral mounting bolt.
[IMG]xc60hitch11 by tonyjag03, on Flickr[/IMG]
[IMG]xc60hitch12 by tonyjag03, on Flickr[/IMG]
Right side showing side-looking radar (black box).
xc60hitch13 by tonyjag03, on Flickr
To avoid rattles, bend the heatshield away from the hitch and body until you hear nothing when tapping the shield.
[IMG]xc60hitch14 by tonyjag03, on Flickr[/IMG]
It is a very close fit, but we have heard no banging or rattling.
[IMG]xc60hitch15 by tonyjag03, on Flickr[/IMG]
Before replacing bumper.
[IMG]xc60hitch16 by tonyjag03, on Flickr[/IMG]
Bumper in place. I looked up the torque spec for M10 class8.8 bolts...38 Nt-M lubricated..and torqued the 6 bolts after lubricating the threads with fluid film rust inhibitor.
[IMG]xc60hitch17 by tonyjag03, on Flickr[/IMG]
All done. I will post a better picture sometime. No wiring done yet, but now we can carry excess cargo in our hitch haul.
[IMG]xc60hitch18 by tonyjag03, on Flickr[/IMG][IMG]xc60hitch19 by tonyjag03, on Flickr[/IMG]
Reassemble the cover, being sure to plug in the connector (as noted by CLB_IV) and put the cable in the black plastic clip.
Good luck! Please post any corrections or improvements. Thanks.