19 
Installing the Base with Different Types of Seat Belts
Primo Viaggio Sip is designed for use 
with lap or lap/shoulder seat belts. Four 
of the most common types are listed 
below. Please read your vehicle manual 
for instructions on installing an infant 
car seat using your vehicle seat belts.
I   Lap/Shoulder belt with 
Switchable Locking Retractor 
If your vehicle has Switchable 
Locking Retractor lap/shoulder belts, 
pull the shoulder strap all the way 
out, let it retract several inches, then 
pull it out again. It should lock in 
place to properly secure the base.
II   Lap/Shoulder belt with 
Emergency Locking Retractor 
(ELR) and free sliding latch plate 
This type of seat belt will only lock in 
an emergency, so you must use the 
locking clip (stored on infant seat