Fiat 500 X 2016 Owner's Manual page 228

226 SAFETY
2. Grasp the mini-latch plate and pull the seat belt over
the seat.
Pulling Out The Latch Plate
3. Route the shoulder belt to the inside of the left head
restraint.
4. When the seat belt is long enough to fit, insert the
mini-latch plate into the mini-buckle until you hear a
"click."
5. Sit back in seat. Slide the regular latch plate up the
webbing as far as necessary to allow the seat belt to go
around your lap.
6. When the seat belt is long enough to fit, insert the latch
plate into the buckle until you hear a "click."