Hi Lance,
There's a site called fuse-box.info that has what you're looking for.
[link|https://fuse-box.info/scion/scion-xb-2007-2015-fuses|Fuse Box Diagram Scion xB (2007-2015)|new_window=true]
On your car it should be fuse #15 in the fuse box on the lower part of the dash. Here are some pictures from that site.
[image|2731068]
The fuse marked in red should be what you're looking for.
[image|2731070]