Fiat 500X (from 2014) - fuse box diagram - Auto Genius Fiat 500X (from 2014) – fuse box diagram. Year of production: 2014, 2015, 2016. Fuse box in engine compartment. The fuse box is located by the side of battery. Interior Fuse Box Location: 2016-2017 Fiat 500X - 2016 Click to view0:17Some Fiats have multiple interior fuse boxes including in the trunk - the video above will show you where the interior fuse box of your 2016 500X is located. If your 500X has many options like a sunroof, navigation, heated seats, etc, the more fuses it has.